Please note: this site relies heavily on the use of javascript. Without a javascript-enabled browser, this site will not function correctly. Please enable javascript and reload the page, or switch to a different browser.
16  structures 1709  species 2  interactions 2493  sequences 43  architectures

Family: DNA_mis_repair (PF01119)

Summary: DNA mismatch repair protein, C-terminal domain

Pfam includes annotations and additional family information from a range of different sources. These sources can be accessed via the tabs below.

This is the Wikipedia entry entitled "DNA mismatch repair". More...

DNA mismatch repair Edit Wikipedia article

Diagram of DNA mismatch repair pathways. The first column depicts mismatch repair in eukaryotes, while the second depicts repair in most bacteria. The third column shows mistmatch repair, to be specific in E. coli.

DNA mismatch repair is a system for recognizing and repairing erroneous insertion, deletion, and mis-incorporation of bases that can arise during DNA replication and recombination, as well as repairing some forms of DNA damage.[1][2]

Mismatch repair is strand-specific. During DNA synthesis the newly synthesised (daughter) strand will commonly include errors. In order to begin repair, the mismatch repair machinery distinguishes the newly synthesised strand from the template (parental). In gram-negative bacteria, transient hemimethylation distinguishes the strands (the parental is methylated and daughter is not). However, in other prokaryotes and eukaryotes, the exact mechanism is not clear. It is suspected that, in eukaryotes, newly synthesized lagging-strand DNA transiently contains nicks (before being sealed by DNA ligase) and provides a signal that directs mismatch proofreading systems to the appropriate strand. This implies that these nicks must be present in the leading strand, and evidence for this has recently been found.[3] Recent work[4] has shown that nicks are sites for RFC-dependent loading of the replication sliding clamp PCNA, in an orientation-specific manner, such that one face of the donut-shape protein is juxtaposed toward the 3'-OH end at the nick. Oriented PCNA then directs the action of the MutLalpha endonuclease to one strand in the presence of a mismatch and MutSalpha or MutSbeta.

Any mutational event that disrupts the superhelical structure of DNA carries with it the potential to compromise the genetic stability of a cell. The fact that the damage detection and repair systems are as complex as the replication machinery itself highlights the importance evolution has attached to DNA fidelity.

Examples of mismatched bases include a G/T or A/C pairing (see DNA repair). Mismatches are commonly due to tautomerization of bases during G2. The damage is repaired by recognition of the deformity caused by the mismatch, determining the template and non-template strand, and excising the wrongly incorporated base and replacing it with the correct nucleotide. The removal process involves more than just the mismatched nucleotide itself. A few or up to thousands of base pairs of the newly synthesized DNA strand can be removed.

Mismatch repair proteins

DNA mismatch repair protein, C-terminal domain
PDB 1h7u EBI.jpg
hpms2-atpgs
Identifiers
Symbol DNA_mis_repair
Pfam PF01119
Pfam clan CL0329
InterPro IPR013507
PROSITE PDOC00057
SCOP 1bkn
SUPERFAMILY 1bkn

Mismatch repair is a highly conserved process from prokaryotes to eukaryotes. The first evidence for mismatch repair was obtained from S. pneumoniae (the hexA and hexB genes). Subsequent work on E. coli has identified a number of genes that, when mutationally inactivated, cause hypermutable strains. The gene products are, therefore, called the "Mut" proteins, and are the major active components of the mismatch repair system. Three of these proteins are essential in detecting the mismatch and directing repair machinery to it: MutS, MutH and MutL (MutS is a homologue of HexA and MutL of HexB).

MutS forms a dimer (MutS2) that recognises the mismatched base on the daughter strand and binds the mutated DNA. MutH binds at hemimethylated sites along the daughter DNA, but its action is latent, being activated only upon contact by a MutL dimer (MutL2), which binds the MutS-DNA complex and acts as a mediator between MutS2 and MutH, activating the latter. The DNA is looped out to search for the nearest d(GATC) methylation site to the mismatch, which could be up to 1 kb away. Upon activation by the MutS-DNA complex, MutH nicks the daughter strand near the hemimethylated site and recruits a UvrD helicase (DNA Helicase II) to separate the two strands with a specific 3' to 5' polarity. The entire MutSHL complex then slides along the DNA in the direction of the mismatch, liberating the strand to be excised as it goes. An exonuclease trails the complex and digests the ss-DNA tail. The exonuclease recruited is dependent on which side of the mismatch MutH incises the strand – 5’ or 3’. If the nick made by MutH is on the 5’ end of the mismatch, either RecJ or ExoVII (both 5’ to 3’ exonucleases) is used. If, however, the nick is on the 3’ end of the mismatch, ExoI (a 3' to 5' enzyme) is used.

The entire process ends past the mismatch site - i.e., both the site itself and its surrounding nucleotides are fully excised. The single-strand gap created by the exonuclease can then be repaired by DNA Polymerase III (assisted by single-strand-binding protein), which uses the other strand as a template, and finally sealed by DNA ligase. DNA methylase then rapidly methylates the daughter strand.

MutS homologs

When bound, the MutS2 dimer bends the DNA helix and shields approximately 20 base pairs. It has weak ATPase activity, and binding of ATP leads to the formation of tertiary structures on the surface of the molecule. The crystal structure of MutS reveals that it is exceptionally asymmetric, and, while its active conformation is a dimer, only one of the two halves interacts with the mismatch site.

In eukaryotes, MutS homologs form two major heterodimers: Msh2/Msh6 (MutSα) and Msh2/Msh3 (MutSβ). The MutSα pathway is involved primarily in base substitution and small-loop mismatch repair. The MutSβ pathway is also involved in small-loop repair, in addition to large-loop (~10 nucleotide loops) repair. However, MutSβ does not repair base substitutions.

MutL homologs

MutL also has weak ATPase activity (it uses ATP for purposes of movement). It forms a complex with MutS and MutH, increasing the MutS footprint on the DNA.

However, the processivity (the distance the enzyme can move along the DNA before dissociating) of UvrD is only ~40–50 bp. Because the distance between the nick created by MutH and the mismatch can average ~600 bp, if there is not another UvrD loaded the unwound section is then free to re-anneal to its complementary strand, forcing the process to start over. However, when assisted by MutL, the rate of UvrD loading is greatly increased. While the processivity (and ATP utilisation) of the individual UvrD molecules remains the same, the total effect on the DNA is boosted considerably; the DNA has no chance to re-anneal, as each UvrD unwinds 40-50 bp of DNA, dissociates, and then is immediately replaced by another UvrD, repeating the process. This exposes large sections of DNA to exonuclease digestion, allowing for quick excision (and later replacement) of the incorrect DNA.

Eukaryotes have MutL homologs designated Mlh1 and Pms1. They form a heterodimer that mimics MutL in E. coli. The human homologue of prokaryotic MutL has three forms designated as MutLα, MutLβ, and MutLγ. The MutLα complex is made of two subunits MLH1 and PMS2, the MutLβ heterodimer is made of MLH1 and PMS1, whereas MutLγ is made of MLH1 and MLH3. MutLα acts as the matchmaker or facilitator, coordinating events in mismatch repair. It has recently been shown to be a DNA endonuclease that introduces strand breaks in DNA upon activation by mismatch and other required proteins, MutSa and PCNA. These strand interruptions serve as entry points for an exonuclease activity that removes mismatched DNA. Roles played by MutLβ and MutLγ in mismatch repair are less-understood.

MutH: an endonuclease present in E. coli and Salmonella

MutH is a very weak endonuclease that is activated once bound to MutL (which itself is bound to MutS). It nicks unmethylated DNA and the unmethylated strand of hemimethylated DNA but does not nick fully methylated DNA. Experiments have shown that mismatch repair is random if neither strand is methylated. These behaviours led to the proposal that MutH determines which strand contains the mismatch. MutH has no eukaryotic homolog. Its endonuclease function is taken up by MutL homologs, which have some specialized 5'-3' exonuclease activity. The strand bias for removing mismatches from the newly synthesized daughter strand in eukaryotes may be provided by the free 3’ ends of Okazaki fragments in the new strand created during replication.

PCNA β-sliding clamp

PCNA and the β-sliding clamp associate with MutSα/β and MutS, respectively. Although initial reports suggested that the PCNA-MutSα complex may enhance mismatch recognition,[5] it has been recently demonstrated[6] that there is no apparent change in affinity of MutSα for a mismatch in the presence or absence of PCNA. Furthermore, mutants of MutSα that are unable to interact with PCNA in vitro exhibit the capacity to carry out mismatch recognition and mismatch excision to near wild type levels. Such mutants are defective in the repair reaction directed by a 5' strand break, suggesting for the first time MutSα function in a post-excision step of the reaction.

Clinical significance

Defects in mismatch repair

Mutations in the human homologues of the Mut proteins affect genomic stability, which can result in microsatellite instability (MI). MI is implicated in most human cancers. To be specific, the overwhelming majority of hereditary nonpolyposis colorectal cancers (HNPCC) are attributed to mutations in the genes encoding the MutS and MutL homologues MSH2 and MLH1 respectively, which allows them to be classified as tumour suppressor genes. A subtype of HNPCC is known as Muir-Torre Syndrome (MTS), which is associated with skin tumors.

Mismatch repair cancer syndrome (also called mismatch repair deficiency or Turcot syndrome) typically combines familial adenomatous polyposis with brain tumors.[7]

Epigenetic defects in cancer

Only a minority of sporadic cancers with a DNA repair deficiency have a mutation in a DNA repair gene. However, a majority of sporadic cancers with a DNA repair deficiency do have one or more epigenetic alterations that reduce or silence DNA repair gene expression.[8] About 13% of colorectal cancers are deficient in DNA mismatch repair, with 9.8% due to loss of MLH1 and smaller percentages due to losses of MSH2 (1.4%), MSH6 (0.5%) and PMS2 (1.5%).[9] For 65 out of 66 cases of sporadic cancer in which MLH1 was deficient, the deficiency was due to methylation of the promoter region of MLH1.[9]

Other cancers have higher frequencies of loss of MMR due to loss of MLH1 (see table, below). As indicated in the table, defects in MMR that were due to loss of MLH1 expression were evaluated, and it was found that deficiencies of MLH1 were largely a result of methylation of the promoter region of the MLH1 gene.

Another epigenetic mechanism by which MLH1 and MSH2 expression is reduced is over-expression of miR-155.[10] MiR-155 targets MLH1 and MSH2. In human colorectal cancer an inverse correlation between the expression of miR-155 and the expression of MLH1 or MSH2 proteins was found.[10]

Deficient expression in cancers

Cancers deficient in MLH1
Cancer type Frequency of deficiency in cancer Frequency of deficiency in adjacent field defect
Stomach 32%[11][12] 24%-28%
Stomach (foveolar type tumors) 74%[13] 71%
Stomach in high-incidence Kashmir Valley 73%[14] 20%
Esophageal 73%[15] 27%
Head and neck squamous cell carcinoma (HNSCC) 31%-33%[16][17] 20%-25%
Non-small cell lung cancer (NSCLC) 69%[18] 72%
Colorectal 10%[9]

Deficiency in field defects

A field defect is an area or "field" of epithelium that has been preconditioned by epigenetic changes and/or mutations so as to predispose it towards development of cancer. As pointed out by Rubin, "The vast majority of studies in cancer research has been done on well-defined tumors in vivo, or on discrete neoplastic foci in vitro.[19] Yet there is evidence that more than 80% of the somatic mutations found in mutator phenotype human colorectal tumors occur before the onset of terminal clonal expansion."[20] Similarly, Vogelstein et al.[21] point out that more than half of somatic mutations identified in tumors occurred in a pre-neoplastic phase (in a field defect), during growth of apparently normal cells.

In the Table above, MLH1 deficiencies were noted in the field defects (histologically normal tissues) surrounding most of the cancers. If MLH1 is epigenetically reduced or silenced, it would not likely confer a selective advantage upon a stem cell. However, reduced or absent expression of MLH1 would cause increased rates of mutation, and one or more of the mutated genes may provide the cell with a selective advantage. The expression-deficient MLH1 gene could then be carried along as a selectively neutral or only slightly deleterious passenger (hitch-hiker) gene when the mutated stem cell generates an expanded clone. The continued presence of a clone with an epigenetically repressed MLH1 would continue to generate further mutations, some of which could produce a tumor.

MMR deficiency in humans

In humans, seven DNA mismatch repair (MMR) proteins (MLH1, MLH3, MSH2, MSH3, MSH6, PMS1 and PMS2) work coordinately in sequential steps to initiate repair of DNA mismatches.[22] In addition, there are Exo1-dependent and Exo1-independent MMR subpathways.[23]

Other gene products involved in mismatch repair (subsequent to initiation by MMR genes) in humans include DNA polymerase delta, PCNA, RPA, HMGB1, RFC and DNA ligase I, plus histone and chromatin modifying factors.[24][25]

Lack of MMR and mutation frequency

Recognizing mismatches and repairing them is important for cells because failure to do so results in microsatellite instability (MSI) and an elevated spontaneous mutation rate (mutator phenotype). Among 20 cancers evaluated, (see Mutation frequencies in cancers) mismatch repair deficient microsatellite instable (MSI) colon cancer had the second highest frequency of mutations (after melanoma).

However, lack of MMR often occurs in coordination with loss of other DNA repair genes.[8] In one example, involving MLH1 and MLH3, Jiang et al.[26] conducted a study where they evaluated the mRNA expression of 27 DNA repair genes in 40 astrocytomas compared to normal brain tissues from non-astrocytoma individuals. Among the 27 DNA repair genes evaluated, 13 DNA repair genes, MLH1, MLH3, MGMT, NTHL1, OGG1, SMUG1, ERCC1, ERCC2, ERCC3, ERCC4, RAD50, XRCC4 and XRCC5 were all significantly down-regulated in all three grades (II, III and IV) of astrocytomas. The repression of these 13 genes in lower grade as well as in higher grade astrocytomas suggested that they may be important in early as well as in later stages of astrocytoma. In another example, Kitajima et al.[27] found that immunoreactivity for MLH1 and MGMT expression was closely correlated in 135 specimens of gastric cancer and loss of MLH1 and MGMT appeared to be synchronously accelerated during tumor progression.

Deficient expression of multiple DNA repair genes is often found in cancers,[8] and may contribute to the thousands of mutations usually found in cancers (see Mutation frequencies in cancers).

See also

References

  1. ^ Iyer R, Pluciennik A, Burdett V, Modrich P (2006). "DNA mismatch repair: functions and mechanisms". Chem Rev 106 (2): 302–23. doi:10.1021/cr0404794. PMID 16464007. 
  2. ^ Larrea AA, Lujan SA, Kunkel TA (2010). "DNA mismatch repair". Cell 141 (4): 730. doi:10.1016/j.cell.2010.05.002. PMID 20478261. 
  3. ^ Heller RC, Marians KJ (2006). "Replisome assembly and the direct restart of stalled replication forks". Nat Rev Mol Cell Biol 7 (12): 932–43. doi:10.1038/nrm2058. PMID 17139333. 
  4. ^ Pluciennik; et al. (2010). "PCNA function in the activation and strand direction of MutLα endonuclease in mismatch repair.". PNAS 107 (37): 16066–71. doi:10.1073/pnas.1010662107. PMC 2941292. PMID 20713735. 
  5. ^ Flores-Rozas H, Clark D, Kolodner RD (2000). "Proliferating cell nuclear antigen and Msh2p-Msh6p interact to form an active mispair recognition complex". Nature Genetics 26 (3): 375–8. doi:10.1038/81708. PMID 11062484. 
  6. ^ Iyer RR, Pohlhaus TJ, Chen S, Hura GL, Dzantiev L, Beese LS, Modrich P (2008). "The MutSalpha-proliferating cell nuclear antigen interaction in human DNA mismatch repair". Journal of Biological Chemistry 283 (19): 13310–9. doi:10.1074/jbc.M800606200. PMC 2423938. PMID 18326858. 
  7. ^ Online 'Mendelian Inheritance in Man' (OMIM) 276300
  8. ^ a b c Bernstein C, Bernstein H (2015). "Epigenetic reduction of DNA repair in progression to gastrointestinal cancer". World J Gastrointest Oncol 7 (5): 30–46. doi:10.4251/wjgo.v7.i5.30. PMC 4434036. PMID 25987950. 
  9. ^ a b c Truninger K, Menigatti M, Luz J, Russell A, Haider R, Gebbers JO, Bannwart F, Yurtsever H, Neuweiler J, Riehle HM, Cattaruzza MS, Heinimann K, Schär P, Jiricny J, Marra G (2005). "Immunohistochemical analysis reveals high frequency of PMS2 defects in colorectal cancer". Gastroenterology 128 (5): 1160–71. doi:10.1053/j.gastro.2005.01.056. PMID 15887099. 
  10. ^ a b Valeri N, Gasparini P, Fabbri M, Braconi C, Veronese A, Lovat F, Adair B, Vannini I, Fanini F, Bottoni A, Costinean S, Sandhu SK, Nuovo GJ, Alder H, Gafa R, Calore F, Ferracin M, Lanza G, Volinia S, Negrini M, McIlhatton MA, Amadori D, Fishel R, Croce CM (2010). "Modulation of mismatch repair and genomic stability by miR-155". Proc. Natl. Acad. Sci. U.S.A. 107 (15): 6982–7. doi:10.1073/pnas.1002472107. PMC 2872463. PMID 20351277. 
  11. ^ Kupčinskaitė-Noreikienė R, Skiecevičienė J, Jonaitis L, Ugenskienė R, Kupčinskas J, Markelis R, Baltrėnas V, Sakavičius L, Semakina I, Grižas S, Juozaitytė E (2013). "CpG island methylation of the MLH1, MGMT, DAPK, and CASP8 genes in cancerous and adjacent noncancerous stomach tissues". Medicina (Kaunas) 49 (8): 361–6. PMID 24509146. 
  12. ^ Waki T, Tamura G, Tsuchiya T, Sato K, Nishizuka S, Motoyama T (2002). "Promoter methylation status of E-cadherin, hMLH1, and p16 genes in nonneoplastic gastric epithelia". Am. J. Pathol. 161 (2): 399–403. doi:10.1016/S0002-9440(10)64195-8. PMC 1850716. PMID 12163364. 
  13. ^ Endoh Y, Tamura G, Ajioka Y, Watanabe H, Motoyama T (2000). "Frequent hypermethylation of the hMLH1 gene promoter in differentiated-type tumors of the stomach with the gastric foveolar phenotype". Am. J. Pathol. 157 (3): 717–22. doi:10.1016/S0002-9440(10)64584-1. PMC 1949419. PMID 10980110. 
  14. ^ Wani M, Afroze D, Makhdoomi M, Hamid I, Wani B, Bhat G, Wani R, Wani K (2012). "Promoter methylation status of DNA repair gene (hMLH1) in gastric carcinoma patients of the Kashmir valley". Asian Pac. J. Cancer Prev. 13 (8): 4177–81. doi:10.7314/apjcp.2012.13.8.4177. PMID 23098428. 
  15. ^ Chang Z, Zhang W, Chang Z, Song M, Qin Y, Chang F, Guo H, Wei Q (2015). "Expression characteristics of FHIT, p53, BRCA2 and MLH1 in families with a history of oesophageal cancer in a region with a high incidence of oesophageal cancer". Oncol Lett 9 (1): 430–436. doi:10.3892/ol.2014.2682. PMC 4246613. PMID 25436004. 
  16. ^ Tawfik HM, El-Maqsoud NM, Hak BH, El-Sherbiny YM (2011). "Head and neck squamous cell carcinoma: mismatch repair immunohistochemistry and promoter hypermethylation of hMLH1 gene". Am J Otolaryngol 32 (6): 528–36. doi:10.1016/j.amjoto.2010.11.005. PMID 21353335. 
  17. ^ Zuo C, Zhang H, Spencer HJ, Vural E, Suen JY, Schichman SA, Smoller BR, Kokoska MS, Fan CY (2009). "Increased microsatellite instability and epigenetic inactivation of the hMLH1 gene in head and neck squamous cell carcinoma". Otolaryngol Head Neck Surg 141 (4): 484–90. doi:10.1016/j.otohns.2009.07.007. PMID 19786217. 
  18. ^ Safar AM, Spencer H, Su X, Coffey M, Cooney CA, Ratnasinghe LD, Hutchins LF, Fan CY (2005). "Methylation profiling of archived non-small cell lung cancer: a promising prognostic system". Clin. Cancer Res. 11 (12): 4400–5. doi:10.1158/1078-0432.CCR-04-2378. PMID 15958624. 
  19. ^ Rubin H (March 2011). "Fields and field cancerization: the preneoplastic origins of cancer: asymptomatic hyperplastic fields are precursors of neoplasia, and their progression to tumors can be tracked by saturation density in culture". BioEssays 33 (3): 224–31. doi:10.1002/bies.201000067. PMID 21254148. 
  20. ^ Tsao JL, Yatabe Y, Salovaara R, Järvinen HJ, Mecklin JP, Aaltonen LA, Tavaré S, Shibata D (February 2000). "Genetic reconstruction of individual colorectal tumor histories". Proc. Natl. Acad. Sci. U.S.A. 97 (3): 1236–41. doi:10.1073/pnas.97.3.1236. PMC 15581. PMID 10655514. 
  21. ^ Vogelstein B, Papadopoulos N, Velculescu VE, Zhou S, Diaz LA, Kinzler KW (March 2013). "Cancer genome landscapes". Science 339 (6127): 1546–58. doi:10.1126/science.1235122. PMC 3749880. PMID 23539594. 
  22. ^ Pal T, Permuth-Wey J, Sellers TA (2008). "A review of the clinical relevance of mismatch-repair deficiency in ovarian cancer". Cancer 113 (4): 733–42. doi:10.1002/cncr.23601. PMC 2644411. PMID 18543306. 
  23. ^ Goellner EM, Putnam CD, Kolodner RD (2015). "Exonuclease 1-dependent and independent mismatch repair". DNA Repair (Amst.) 32: 24–32. doi:10.1016/j.dnarep.2015.04.010. PMID 25956862. 
  24. ^ Li GM (2008). "Mechanisms and functions of DNA mismatch repair". Cell Res. 18 (1): 85–98. doi:10.1038/cr.2007.115. PMID 18157157. 
  25. ^ Li GM (2014). "New insights and challenges in mismatch repair: getting over the chromatin hurdle". DNA Repair (Amst.) 19: 48–54. doi:10.1016/j.dnarep.2014.03.027. PMC 4127414. PMID 24767944. 
  26. ^ Jiang Z, Hu J, Li X, Jiang Y, Zhou W, Lu D (2006). "Expression analyses of 27 DNA repair genes in astrocytoma by TaqMan low-density array". Neurosci. Lett. 409 (2): 112–7. doi:10.1016/j.neulet.2006.09.038. PMID 17034947. 
  27. ^ Kitajima Y, Miyazaki K, Matsukura S, Tanaka M, Sekiguchi M (2003). "Loss of expression of DNA repair enzymes MGMT, hMLH1, and hMSH2 during tumor progression in gastric cancer". Gastric Cancer 6 (2): 86–95. doi:10.1007/s10120-003-0213-z. PMID 12861399. 

Further reading

External links

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.

DNA mismatch repair protein, C-terminal domain Provide feedback

This family represents the C-terminal domain of the mutL/hexB/PMS1 family. This domain has a ribosomal S5 domain 2-like fold.

External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR013507

This entry represents the C-terminal domain of DNA mismatch repair proteins, such as MutL. This domain functions in promoting dimerisation [PUBMED:16024043]. The dimeric MutL protein has a key function in communicating mismatch recognition by MutS to downstream repair processes. Mismatch repair contributes to the overall fidelity of DNA replication by targeting mispaired bases that arise through replication errors during homologous recombination and as a result of DNA damage. It involves the correction of mismatched base pairs that have been missed by the proofreading element of the DNA polymerase complex [PUBMED:14527292].

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...

Loading domain graphics...

Pfam Clan

This family is a member of clan S5 (CL0329), which has the following description:

This superfamily contains a wide range of families that possess a structure similar to the second domain of ribosomal S5 protein.

The clan contains the following 17 members:

ChlI DNA_gyraseB DNA_mis_repair EFG_IV Fae GalKase_gal_bdg GHMP_kinases_N IGPD Lon_C LpxC Ribonuclease_P Ribosomal_S5_C Ribosomal_S9 RNase_PH Topo-VIb_trans UPF0029 Xol-1_N

Alignments

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 (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets, the UniProtKB sequence database, the NCBI sequence database, and our metagenomics sequence database. More...

View options

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.

  Seed
(127)
Full
(2493)
Representative proteomes UniProt
(10088)
NCBI
(15277)
Meta
(761)
RP15
(736)
RP35
(1639)
RP55
(2367)
RP75
(3106)
Jalview View  View  View  View  View  View  View  View  View 
HTML View  View               
PP/heatmap 1 View               

1Cannot generate PP/Heatmap alignments for seeds; no PP data available

Key: ✓ available, x not generated, not available.

Format an alignment

  Seed
(127)
Full
(2493)
Representative proteomes UniProt
(10088)
NCBI
(15277)
Meta
(761)
RP15
(736)
RP35
(1639)
RP55
(2367)
RP75
(3106)
Alignment:
Format:
Order:
Sequence:
Gaps:
Download/view:

Download options

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.

  Seed
(127)
Full
(2493)
Representative proteomes UniProt
(10088)
NCBI
(15277)
Meta
(761)
RP15
(736)
RP35
(1639)
RP55
(2367)
RP75
(3106)
Raw Stockholm Download   Download   Download   Download   Download   Download   Download   Download   Download  
Gzipped Download   Download   Download   Download   Download   Download   Download   Download   Download  

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

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...

Trees

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: SCOP
Previous IDs: none
Type: Family
Author: Finn RD, Bateman A, Griffiths-Jones SR
Number in seed: 127
Number in full: 2493
Average length of the domain: 118.70 aa
Average identity of full alignment: 25 %
Average coverage of the sequence by the domain: 16.44 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 11927849 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 20.6 20.6
Trusted cut-off 20.6 20.7
Noise cut-off 20.5 20.5
Model length: 119
Family (HMM) version: 16
Download: download the raw HMM for this family

Species distribution

Sunburst controls

Hide

Weight segments by...


Change the size of the sunburst

Small
Large

Colour assignments

Archea Archea Eukaryota Eukaryota
Bacteria Bacteria Other sequences Other sequences
Viruses Viruses Unclassified Unclassified
Viroids Viroids Unclassified sequence Unclassified sequence

Selections

Align selected sequences to HMM

Generate a FASTA-format file

Clear selection

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...

Loading sunburst data...

Tree controls

Hide

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

Loading...

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.

Interactions

There are 2 interactions for this family. More...

HATPase_c_3 HATPase_c

Structures

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 DNA_mis_repair domain has been found. There are 16 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.

Loading structure mapping...