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18  structures 135  species 0  interactions 1000  sequences 1  architecture

Family: Interferon (PF00143)

Summary: Interferon alpha/beta domain

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Interferon alpha/beta domain
1RH2 Recombinant Human Interferon-Alpha 2b-01.png
The molecular structure of human interferon-alpha
Symbol Interferon
Pfam PF00143
InterPro IPR000471
SCOP 1au1

Interferons (IFNs) are proteins made and released by host cells in response to the presence of pathogens such as viruses, bacteria, parasites or tumor cells. They allow for communication between cells to trigger the protective defenses of the immune system that eradicate pathogens or tumors.

IFNs belong to the large class of glycoproteins known as cytokines. Interferons are named after their ability to "interfere" with viral replication within host cells. IFNs have other functions: they activate immune cells, such as natural killer cells and macrophages; they increase recognition of infection or tumor cells by up-regulating antigen presentation to T lymphocytes; and they increase the ability of uninfected host cells to resist new infection by virus. Certain symptoms, such as aching muscles and fever, are related to the production of IFNs during infection.

About ten distinct IFNs have been identified in mammals; seven of these have been described for humans. They are typically divided among three IFN classes: Type I IFN, Type II IFN, and Type III IFN. IFNs belonging to all IFN classes are very important for fighting viral infections.

Types of interferon[edit]

Based on the type of receptor through which they signal, human interferons have been classified into three major types.

  • Interferon type III: Signal through a receptor complex consisting of IL10R2 (also called CRF2-4) and IFNLR1 (also called CRF2-12). Acceptance of this classification is less universal than that of type I and type II, and unlike the other two, it is not currently included in Medical Subject Headings.[3]


All interferons share several common effects; they are antiviral agents and can fight tumors.

As an infected cell dies from a cytolytic virus, viral particles are released that can infect nearby cells. However, the infected cell can warn neighboring cells of a viral presence by releasing interferon. The neighboring cells, in response to interferon, produce large amounts of an enzyme known as protein kinase R (PKR). This enzyme phosphorylates a protein known as eIF-2 in response to new viral infections; the phosphorylated eIF-2 forms an inactive complex with another protein, called eIF2B, to reduce protein synthesis within the cell. Another cellular enzyme, RNAse L—also induced following PKR activation—destroys RNA within the cells to further reduce protein synthesis of both viral and host genes. Inhibited protein synthesis destroys both the virus and infected host cells. In addition, interferons induce production of hundreds of other proteins—known collectively as interferon-stimulated genes (ISGs)—that have roles in combating viruses.[4][5] They also limit viral spread by increasing p53 activity, which kills virus-infected cells by promoting apoptosis.[6][7] The effect of IFN on p53 is also linked to its protective role against certain cancers.[6]

Another function of interferons is to upregulate major histocompatibility complex molecules, MHC I and MHC II, and increase immunoproteasome activity. Higher MHC I expression increases presentation of viral peptides to cytotoxic T cells, while the immunoproteasome processes viral peptides for loading onto the MHC I molecule, thereby increasing the recognition and killing of infected cells. Higher MHC II expression increases presentation of viral peptides to helper T cells; these cells release cytokines (such as more interferons and interleukins, among others) that signal to and co-ordinate the activity of other immune cells.

Interferons, such as interferon gamma, directly activate other immune cells, such as macrophages and natural killer cells.

Interferons can inflame the tongue and cause dysfunction in taste bud cells, restructuring or killing taste buds entirely.[8]

Induction of interferons[edit]

Production of interferons predominantly occurs in response to microbes, such as viruses and bacteria, and their products. Binding of molecules uniquely found in microbes—viral glycoproteins, viral RNA, bacterial endotoxin (lipopolysaccharide), bacterial flagella, CpG motifs—by pattern recognition receptors, such as membrane bound Toll like receptors or the cytoplasmic receptors RIG-I or MDA5, can trigger release of IFNs. Toll Like Receptor 3 (TLR3) is important for inducing interferon in response to the presence of double-stranded RNA viruses; the ligand for this receptor is double-stranded RNA (dsRNA). After binding dsRNA, this receptor activates the transcription factors IRF3 and NF-κB, which are important for initiating synthesis of many inflammatory proteins. RNA interference technology tools such as siRNA or vector-based reagents can either silence or stimulate interferon pathways.[9] Release of IFN from cells is also induced by mitogens. Other cytokines, such as interleukin 1, interleukin 2, interleukin-12, tumor necrosis factor and colony-stimulating factor, can also enhance interferon production.[10]

Downstream signaling[edit]

By interacting with their specific receptors, IFNs activate signal transducer and activator of transcription (STAT) complexes; STATs are a family of transcription factors that regulate the expression of certain immune system genes. Some STATs are activated by both type I and type II IFNs. However each IFN type can also activate unique STATs.[11]

STAT activation initiates the most well-defined cell signaling pathway for all IFNs, the classical Janus kinase-STAT (JAK-STAT) signaling pathway.[11] In this pathway, JAKs associate with IFN receptors and, following receptor engagement with IFN, phosphorylate both STAT1 and STAT2. As a result, an IFN-stimulated gene factor 3 (ISGF3) complex forms—this contains STAT1, STAT2 and a third transcription factor called IRF9—and moves into the cell nucleus. Inside the nucleus, the ISGF3 complex binds to specific nucleotide sequences called IFN-stimulated response elements (ISREs) in the promoters of certain genes, known as IFN stimulated genes ISGs. Binding of ISGF3 and other transcriptional complexes activated by IFN signaling to these specific regulatory elements induces transcription of those genes.[11] A collection of known ISGs is available on Interferome, a curated online database of ISGs (;[12] Additionally, STAT homodimers or heterodimers form from different combinations of STAT-1, -3, -4, -5, or -6 during IFN signaling; these dimers initiate gene transcription by binding to IFN-activated site (GAS) elements in gene promoters.[11] Type I IFNs can induce expression of genes with either ISRE or GAS elements, but gene induction by type II IFN can occur only in the presence of a GAS element.[11]

In addition to the JAK-STAT pathway, IFNs can activate several other signaling cascades. Both type I and type II IFNs activate a member of the CRK family of adaptor proteins called CRKL, a nuclear adaptor for STAT5 that also regulates signaling through the C3G/Rap1 pathway.[11] Type I IFNs further activate p38 mitogen-activated protein kinase (MAP kinase) to induce gene transcription.[11] Antiviral and antiproliferative effects specific to type I IFNs result from p38 MAP kinase signaling. The phosphatidylinositol 3-kinase (PI3K) signaling pathway is also regulated by both type I and type II IFNs. PI3K activates P70-S6 Kinase 1, an enzyme that increases protein synthesis and cell proliferation; phosphorylates of ribosomal protein s6, which is involved in protein synthesis; and phosphorylates a translational repressor protein called eukaryotic translation-initiation factor 4E-binding protein 1 (EIF4EBP1) in order to deactivate it.[11]

Virus resistance to interferons[edit]

Many viruses have evolved mechanisms to resist interferon activity.[13] They circumvent the IFN response by blocking downstream signaling events that occur after the cytokine binds to its receptor, by preventing further IFN production, and by inhibiting the functions of proteins that are induced by IFN.[14] Viruses that inhibit IFN signaling include Japanese Encephalitis Virus (JEV), dengue type 2 virus (DEN-2) and viruses of the herpesvirus family, such as human cytomegalovirus (HCMV) and Kaposi's sarcoma-associated herpesvirus (KSHV or HHV8).[14][15] Viral proteins proven to affect IFN signaling include EBV nuclear antigen 1 (EBNA1) and EBV nuclear antigen 2 (EBNA-2) from Epstein-Barr virus, the large T antigen of Polyomavirus, the E7 protein of Human papillomavirus (HPV), and the B18R protein of vaccinia virus.[15][16] Reducing IFN-α activity may prevent signaling via STAT1, STAT2, or IRF9 (as with JEV infection) or through the JAK-STAT pathway (as with DEN-2 infection).[14] Several poxviruses encode soluble IFN receptor homologs—like the B18R protein of the vaccinia virus—that bind to and prevent IFN interacting with its cellular receptor, impeding communication between this cytokine and its target cells.[16] Some viruses can encode proteins that bind to double-stranded RNA (dsRNA) to prevent the activity of RNA-dependent protein kinases; this is the mechanism reovirus adopts using its sigma 3 (σ3) protein, and vaccinia virus employs using the gene product of its E3L gene, p25.[17][18][19] The ability of interferon to induce protein production from interferon stimulated genes (ISGs) can also be affected. Production of protein kinase R, for example, can be disrupted in cells infected with JEV or flaviviruses.[14] Some viruses escape the anti-viral activities of interferons by gene (and thus protein) mutation. The H5N1 influenza virus, also known as bird flu, has resistance to interferon and other anti-viral cytokines that is attributed to a single amino acid change in its Non-Structural Protein 1 (NS1), although the precise mechanism of how this confers immunity is unclear.[20]

Interferon therapy[edit]

Three vials filled with human leukocyte interferon


The immune effects of interferons have been exploited to treat several diseases. Agents that activate the immune system, such as small imidazoquinoline molecules that activate TLR7, can induce IFN-α. Imidazoquinoline is the main ingredient of Aldara (Imiquimod) cream, a treatment approved in the United States by the Food and Drug Administration (FDA) for actinic keratosis, superficial basal cell carcinoma, papilloma and external genital warts.[21] Synthetic IFNs are also made, and administered as antiviral, antiseptic and anticarcinogenic drugs, and to treat some autoimmune diseases.

New research has shown that imiquimod's anti-proliferative effect is totally independent of immune system activation or function. Imiquimod exerts its effect by increasing levels of the opioid growth factor receptor (OGFr). Blocking OGFr function with siRNA technology resulted in loss of any antiproliferative effect of imiquimod.[22]

Interferon beta-1a and interferon beta-1b are used to treat and control multiple sclerosis, an autoimmune disorder. This treatment is effective for slowing disease progression and activity in relapsing-remitting multiple sclerosis and reducing attacks in secondary progressive multiple sclerosis.[23]

Interferon therapy is used (in combination with chemotherapy and radiation) as a treatment for many cancers.[21] This treatment is most effective for treating hematological malignancy; leukemia and lymphomas including hairy cell leukemia, chronic myeloid leukemia, nodular lymphoma, cutaneous T-cell lymphoma.[21] Patients with recurrent melanomas receive recombinant IFN-α2b.[24] Type I IFNs have a therapeutic potential for the treatment of a wide variety of leukemias and solid tumors due to their antiproliferative and apoptotic effects, their anti-angiogenic effects and their ability to modulate an immune response specifically activating dendritic cells, cytolytic T cells and NK cells. Research in this area is receiving intensive investigation.[25] Interferon a 2b is also being used for treatment of ocular surface squamous neoplasia (OSSN) in the form of perilesional injection followed by topical interferon a 2b drops at Lahore General Hospital Eye unit II.[citation needed]

Both hepatitis B and hepatitis C are treated with IFN-α, often in combination with other antiviral drugs.[26][27] Some of those treated with interferon have a sustained virological response and can eliminate hepatitis virus. The most harmful strain—hepatitis C genotype I virus—can be treated with a 60-80% success rate with the current standard-of-care treatment of interferon-α, ribavirin and recently approved protease inhibitors such as Telaprevir (Incivek) or Boceprevir (Victrelis).[28] Biopsies of patients given the treatment show reductions in liver damage and cirrhosis. Some evidence shows giving interferon immediately following infection can prevent chronic hepatitis C, although diagnosis early in infection is difficult since physical symptoms are sparse in early hepatitis C infection. Control of chronic hepatitis C by IFN is associated with reduced hepatocellular carcinoma.[29]

Administered intranasally in very low doses, interferon is extensively used in Eastern Europe and Russia as a method to prevent and treat viral respiratory diseases such as cold and flu. However, mechanisms of such action of interferon are not well understood; it is thought that doses must be larger by several orders of magnitude to have any effect on the virus. Although most scientists are skeptical of any claims of good efficacy,[30] recent findings suggest that interferon applied to mucosa may act as an adjuvant against influenza virus, boosting the specific immune system response against the virus.[29] A flu vaccine that uses interferon as adjuvant is currently under clinical trials in the US.[31]

When used in the systemic therapy, IFNs are mostly administered by an intramuscular injection. The injection of IFNs in the muscle, in the vein, or under skin is generally well tolerated. The most frequent adverse effects are flu-like symptoms: increased body temperature, feeling ill, fatigue, headache, muscle pain, convulsion, dizziness, hair thinning, and depression. Erythema, pain and hardness on the spot of injection are also frequently observed. IFN therapy causes immunosuppression, in particular through neutropenia and can result in some infections manifesting in unusual ways.[32]

Drug formulations[edit]

Pharmaceutical forms of interferons
Generic name Trade name
Interferon alpha 2a Roferon A
Interferon alpha 2b Intron A/Reliferon/Uniferon
Human leukocyte Interferon-alpha (HuIFN-alpha-Le) Multiferon
Interferon beta 1a, liquid form Rebif
Interferon beta 1a, lyophilized Avonex
Interferon beta 1a, biogeneric (Iran) Cinnovex
Interferon beta 1b Betaseron / Betaferon
Interferon gamma 1b Actimmune
PEGylated interferon alpha 2a Pegasys
PEGylated interferon alpha 2a (Egypt) Reiferon Retard
PEGylated interferon alpha 2b PegIntron
PEGylated interferon alpha 2b plus ribavirin (Canada) Pegetron

Several different types of interferon are now approved for use in humans. By March 10, 2009, Multiferon — a brand name known generically as human leukocyte interferon-alpha (HuIFN-alpha-Le) — was being used in 14 European countries. This drug was approved for treatment of patients with high risk (stage IIb–III) cutaneous melanoma, after two treatment cycles with dacarbazine, following a clinical trial performed in Germany.[33][34][35]

In January 2001, the Food and Drug Administration (FDA) approved the use of PEGylated interferon-alpha in the USA; in this formulation, polyethylene glycol is added to make the interferon last longer in the body. Initially used for production of PEGylated interferon-alpha-2b (Pegintron), approval for PEGylated interferon-alpha-2a (Pegasys) followed in October 2002. These PEGylated drugs are injected once weekly, rather than administering three times per week, as is necessary for conventional interferon-alpha. When used with the antiviral drug ribavirin, PEGylated interferon is effective in treatment of hepatitis C; at least 75% people with hepatitis C genotypes 2 or 3 benefit from interferon treatment, although this is effective in less than 50% of people infected with genotype 1 (the more common form of hepatitis C virus in both the U.S. and Western Europe).[36][37][38] Interferon-containing regimens may also include protease inhibitors such as boceprevir and telaprevir.


During research to produce a more efficient vaccine for smallpox, Yasu-ichi Nagano and Yasuhiko Kojima—two Japanese virologists working at the Institute for Infectious Diseases at the University of Tokyo—noticed inhibition of viral growth in an area of rabbit-skin or testis previously inoculated with UV-inactivated virus. They hypothesised that some "viral inhibitory factor" was present in the tissues infected with virus and attempted to isolate and characterize this factor from tissue homogenates. In 1954, these findings were published in a French journal now known as the Journal de la Société de Biologie.[39] After Nagano and Kojima separated the viral inhibitory factor from the viral particles using ultracentrifugation, they confirmed its antiviral activity lasted 1–4 days and did not result from antibody production; their findings were published in 1958.[40][41][42] Nagano's work was never fully appreciated in the scientific community; possibly because it was printed in French, but also because his in vivo system was perhaps too complex to provide clear results in the characterisation and purification of interferon.[43]

Meanwhile, the British virologist Alick Isaacs and the Swiss researcher Jean Lindenmann, at the National Institute for Medical Research in London, noticed an interference effect caused by heat-inactivated influenza virus on the growth of live influenza virus in chicken egg chorioallantoic membrane. They published their results, attaining wide recognition, in 1957;[44] in this paper they coined the term "interferon", and today that specific interfering agent is known as a "Type I interferon".[45] Independently, Monto Ho, in John Ender's lab, made a seminal discovery in 1957 that the RMC virus conferred a species specific anti-viral effect in human amniotic cell cultures. They named this effect the viral inhibitory factor (VIF). Subsequently, Enders and Isaacs agreed that the VIF and Interferon belonged to the same class of viral inhibitory factors.[46] The majority of the credit for discovering interferon goes to Isaacs and Lindenmann, with whom there is no record of Nagano ever having made personal contact.[43] It took another fifteen to twenty years, using somatic cell genetics, to show that the interferon action gene and interferon gene reside in different human chromosomes.[47][48][49] The purification of human beta interferon did not occur until 1977. Chris Y.H. Tan and his co-workers purified and produced biologically active, radio-labeled human beta interferon by superinducing the interferon gene in fibroblast cells, and they showed its active site contains tyrosine residues.[50][51] Tan's laboratory isolated sufficient enough amounts of human beta interferon to perform its first amino acid, sugar composition and N-terminal analyses .[52] They showed that human beta interferon was an unusually hydrophobic glycoprotein. This explained a large loss of interferon activity when interferon preparations were transferred from test tube to test tube or from vessel to vessel during purification. The analyses ascertained once and for all, the reality of interferon activity by chemical verification.[52][53][54][55] The purification of human alpha interferon was not reported until 1978. A series of publications from the laboratories of Sidney Pestka and Alan Waldman between 1978 and 1981, describe the purification of the type I interferons IFN-α and IFN-β.[56] By the early 1980s, the genes for these interferons were cloned, allowing for further definitive proof that interferons really were responsible for interfering with viral replication.[57][58] Gene cloning also confirmed that IFN-α was encoded by, not one gene, but a family of related genes.[59] The type II IFN (IFN-γ) gene was also isolated around this time.[60]

Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing mass cultivation and purification from bacterial cultures[61] or derived from yeast (e.g. Reiferon Retard is the first yeast derived interferon-alpha 2a) Interferon can also be derived from recombinant mammalian cells.[62] Before this, in the early 1970s the large scale reproduction of human interferon was pioneered by Kari Cantell. He produced large amounts of human alpha interferon from massive quantities of human white blood cells collected from and by the Finnish Blood Bank.[63] Large amounts of human beta interferon were made by superinducing the beta interferon gene in human fibroblast cells, a procedure Chris Y.H.Tan discovered with Monto Ho.[64][65] Cantell's and Tan's methods of making large amounts of natural interferons were critical to make purified interferons for their chemical characterisation,for their clinical trials and for the preparations of the scarce amount of interferon messenger RNAs to the clone the human alpha and beta interferon genes. The superinduced human beta interferon messenger RNA was prepared by Tan's lab for Cetus corp. to clone the human beta interferon gene into bacteria and the recombinant interferon was developed as 'betaseron' and approved for the treatment of MS. Superinduction of the human beta interferon gene was also used by Israeli scientists to manufacture human beta interferon, used as a topical anti-herpes agent.

Human interferons[edit]

See also[edit]


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  46. ^ Ho, Monto. "Several Worlds: Reminiscences And Reflections of a Chinese-american Physician", 2005
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  48. ^ Tan, Y.H. Chromosome 21 and the cell growth inhibitory effect of human interferon preparations" Nature 260: 141-143, 1976
  49. ^ Meager A., Graves H,. Burke D.C. and Swallow D.M. Involvement of a gene on chromosome 9 in human fibroblast interferon production, Nature 280: 493-495, 1979
  50. ^ Berthold, W., Tan, C. and Tan, Y.H. Chemical modifications of tyrosyl residue(s) and action of human-fibroblast interferon" Eur. J. Biochem 87: 367-370, 1978
  51. ^ Berthold, W., Tan, C. and Tan, Y.H. Purification and in vitro labelling of interferon from a human fibroblastoid cell line" J. Biol. Chem 253: 5206-5212, 1978
  52. ^ a b Tan, Y.H., Barakat, F., Berthold, W., Smith-Johannsen, H. and Tan, C. The isolation and amino acid/sugar composition of human fibroblastoid interferon" J. Biol. Chem 254: 8067-8073, 1979
  53. ^ Zoon K.C. Smith M.E. Bridgen P.J. Anfinsen C.B. Hunkapillar M.W. and Hood L.E. Amino terminal sequence of the major component of human lymphoblastoid interferon, Science 207: 527 – 528 1980
  54. ^ Okamura, H., Berthold, W., Hood, L., Hunkapiller, M., Inoue, M., Smith-Johannsen, H. and Tan, Y.H. Human fibroblastoid interferon; Immunosorbent column chromatography and N-terminal amino acid sequence" Biochemistry 19: 3831-3835, 1980
  55. ^ Knight, E., JR., Hunkapillar, M. W., Korant, B. D., Hardy, R. W. F., and Hood, L. E" Science 207: 525-526, 1980
  56. ^ Pestka S (July 2007). "The interferons: 50 years after their discovery, there is much more to learn". J. Biol. Chem. 282 (28): 20047–51. doi:10.1074/jbc.R700004200. PMID 17502369. 
  57. ^ Weissenbach J, Chernajovsky Y, Zeevi M, et al. (December 1980). "Two interferon mRNAs in human fibroblasts: in vitro translation and Escherichia coli cloning studies". Proc. Natl. Acad. Sci. U.S.A. 77 (12): 7152–6. Bibcode:1980PNAS...77.7152W. doi:10.1073/pnas.77.12.7152. PMC 350459. PMID 6164058. 
  58. ^ Taniguchi T, Fujii-Kuriyama Y, Muramatsu M (July 1980). "Molecular cloning of human interferon cDNA". Proc. Natl. Acad. Sci. U.S.A. 77 (7): 4003–6. Bibcode:1980PNAS...77.4003T. doi:10.1073/pnas.77.7.4003. PMC 349756. PMID 6159625. 
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  62. ^ Tan Y.H. and Hong W.J. Gene expression in mammalian cells. US patent 6207146, 2001
  63. ^ Cantell, K. The Story of Interferon, 1998
  64. ^ Tan, Y.H., Armstrong, J.A., Ke, Y.H. and Ho, M. Regulation of cellular interferon production" Proc. Natl. Acad. Sci. U.S.A 67: 464-471, 1970
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This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.

Interferon alpha/beta domain Provide feedback

No Pfam abstract.

External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR000471

Interferons [PUBMED:3022999] are proteins which produce antiviral and antiproliferative responses in cells. On the basis of their sequence interferons are classified into five groups: alpha, alpha-II (or omega), beta, delta (or trophoblast). The sequence differences may possibly cause different responses to various inducers, or result in the recognition of different target cell types [PUBMED:6170983]. The main conserved structural feature of interferons is a disulphide bond that, except in mouse beta interferon, occurs in all alpha, beta and omega sequences.

Gene Ontology

The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.

Domain organisation

Below is a listing of the unique domain organisations or architectures in which this domain is found. More...

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Pfam Clan

This family is a member of clan 4H_Cytokine (CL0053), which has the following description:

Cytokines are regulatory peptides that can be produced by various cells for communicating and orchestrating the large multicellular system. Cytokines are key mediators of hematopoiesis, immunity, allergy, inflammation, tissue remodeling, angiogenesis, and embryonic development [2]. This superfamily includes both the long and short chain helical cytokines.

The clan contains the following 22 members:

CNTF EPO_TPO Flt3_lig GM_CSF Hormone_1 IFN-gamma IL10 IL11 IL12 IL13 IL2 IL22 IL3 IL34 IL4 IL5 IL6 Interferon Leptin LIF_OSM PRF SCF


We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database using the family HMM. We also generate alignments using four representative proteomes (RP) sets, the NCBI sequence database, and our metagenomics sequence database. More...

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We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.

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Format an alignment

Representative proteomes NCBI

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We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.

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You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

External links

MyHits provides a collection of tools to handle multiple sequence alignments. For example, one can refine a seed alignment (sequence addition or removal, re-alignment or manual edition) and then search databases for remote homologs using HMMER3.

HMM logo

HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...


This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.

Note: You can also download the data file for the tree.

Curation and family details

This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.

Curation View help on the curation process

Seed source: Prosite
Previous IDs: interferon;
Type: Domain
Author: Sonnhammer ELL
Number in seed: 15
Number in full: 1000
Average length of the domain: 150.70 aa
Average identity of full alignment: 39 %
Average coverage of the sequence by the domain: 85.89 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild --amino -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 25.0 25.0
Trusted cut-off 25.8 25.1
Noise cut-off 23.9 23.6
Model length: 162
Family (HMM) version: 14
Download: download the raw HMM for this family

Species distribution

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This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the adjacent tab. More...

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The tree shows the occurrence of this domain across different species. More...


Please note: for large trees this can take some time. While the tree is loading, you can safely switch away from this tab but if you browse away from the family page entirely, the tree will not be loaded.


For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Interferon domain has been found. There are 18 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.

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