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1  structure 146  species 0  interactions 186  sequences 1  architecture

Family: Lactococcin_972 (PF09683)

Summary: Bacteriocin (Lactococcin_972)

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Bacteriocin Edit Wikipedia article

Lactococcin-like family
Pfam clanCL0400
Bacteriocin (Lactococcin_972)

Bacteriocins are proteinaceous or peptidic toxins produced by bacteria to inhibit the growth of similar or closely related bacterial strain(s). They are similar to yeast and paramecium killing factors, and are structurally, functionally, and ecologically diverse. Applications of bacteriocins are being tested to assess their application as narrow-spectrum antibiotics.[1]

Bacteriocins were first discovered by André Gratia in 1925.[2][3] He was involved in the process of searching for ways to kill bacteria, which also resulted in the development of antibiotics and the discovery of bacteriophage, all within a span of a few years. He called his first discovery a colicine because it killed E. coli.


Bacteriocins are categorized in several ways, including producing strain, common resistance mechanisms, and mechanism of killing. There are several large categories of bacteriocin which are only phenomenologically related. These include the bacteriocins from gram-positive bacteria, the colicins,[4] the microcins, and the bacteriocins from Archaea. The bacteriocins from E. coli are called colicins (formerly called 'colicines', meaning 'coli killers'). They are the longest studied bacteriocins. They are a diverse group of bacteriocins and do not include all the bacteriocins produced by E. coli. In fact, one of the oldest known so-called colicins was called colicin V and is now known as microcin V. It is much smaller and produced and secreted in a different manner than the classic colicins.

This naming system is problematic for a number of reasons. First, naming bacteriocins by what they putatively kill would be more accurate if their killing spectrum were contiguous with genus or species designations. The bacteriocins frequently possess spectra that exceed the bounds of their named taxa and almost never kill the majority of the taxa for which they are named. Further, the original naming is generally derived not from the sensitive strain the bacteriocin kills, but instead the organism that produces the bacteriocin. This makes the use of this naming system a problematic basis for theory; thus the alternative classification systems.

Bacteriocins that contain the modified amino acid lanthionine as part of their structure are called lantibiotics. However, efforts to reorganize the nomenclature of the family of ribosomally synthesized and post-translationally modified peptide (RiPP) natural products have led to the differentiation of lantipeptides from bacteriocins based on biosynthetic genes.[5]

Methods of classification

Alternative methods of classification include: method of killing (pore-forming, nuclease activity, peptidoglycan production inhibition, etc.), genetics (large plasmids, small plasmids, chromosomal), molecular weight and chemistry (large protein, peptide, with/without sugar moiety, containing atypical amino acids such as lanthionine), and method of production (ribosomal, post-ribosomal modifications, non-ribosomal).

From Gram negative bacteria

Gram negative bacteriocins are typically classified by size. Microcins are less than 20 kDa in size, colicin-like bacteriocins are 20 to 90 kDa in size and tailocins or so called high molecular weight bacteriocins which are multi subunit bacteriocins that resemble the tails of bacteriophages. This size classification also coincides with genetic, structural and functional similarities.


See main article on microcins.

Colicin-like bacteriocins

Colicins are bacteriocins (CLBs) found in the Gram-negative E. coli. Similar bacteriocins occur in other Gram-negative bacteria. These CLBs are distinct from Gram-positive bacteriocins. They are modular proteins between 20 and 90 kDa in size. They often consist of a receptor binding domain, a translocation domain and a cytotoxic domain. Combinations of these domains between different CLBs occur frequently in nature and can be created in the laboratory. Due to these combinations further subclassification can be based on either import mechanism (group A and B) or on cytotoxic mechanism (nucleases, pore forming, M-type, L-type).[6]


Most well studied are the tailocins of Pseudomonas aeruginosa. They can be further subdivided into R-type and F-type pyocins.[7]

From Gram positive bacteria

Bacteriocins from Gram positive bacteria are typically classified into Class I, Class IIa/b/c, and Class III. [8]

Class I bacteriocins

The class I bacteriocins are small peptide inhibitors and include nisin and other lantibiotics.

Class II bacteriocins

The class II bacteriocins are small (<10 kDa) heat-stable proteins. This class is subdivided into five subclasses. The class IIa bacteriocins (pediocin-like bacteriocins) are the largest subgroup and contain an N-terminal consensus sequence -Tyr-Gly-Asn-Gly-Val-Xaa-Cys across this group. The C-terminal is responsible for species-specific activity, causing cell-leakage by permeabilizing the target cell wall.

Class IIa bacteriocins have a large potential for use in food preservation as well medical applications due to their strong anti-Listeria activity and broad range of activity. One example of Class IIa bacteriocin is pediocin PA-1.[9]
The class IIb bacteriocins (two-peptide bacteriocins) require two different peptides for activity. One such an example is lactococcin G, which permeabilizes cell membranes for monovalent sodium and potassium cations, but not for divalent cations. Almost all of these bacteriocins have a GxxxG motifs. This motif is also found in transmembrane proteins, where they are involved in helix-helix interactions. Accordingly, the bacteriocin GxxxG motifs can interact with the motifs in the membranes of the bacterial cells, killing the cells.[10]
Class IIc encompasses cyclic peptides, in which the N-terminal and C-terminal regions are covalentely linked. Enterocin AS-48 is the prototype of this group.
Class IId cover single-peptide bacteriocins, which are not post-translationally modified and do not show the pediocin-like signature. The best example of this group is the highly stable aureocin A53. This bacteriocin is stable under highly acidic conditions, high temperatures, and is not affected by proteases.[11]

The most recently proposed subclass is the Class IIe, which encompasses those bacteriocins composed of three or four non-pediocin like peptides. The best example is aureocin A70, a four-peptide bacteriocin, highly active against Listeria monocytogenes, with potential biotechnological applications.[12]

Class III bacteriocins

Class III bacteriocins are large, heat-labile (>10 kDa) protein bacteriocins. This class is subdivided in two subclasses: subclass IIIa (bacteriolysins) and subclass IIIb. Subclass IIIa comprises those peptides that kill bacterial cells by cell wall degradation, thus causing cell lysis. The best studied bacteriolysin is lysostaphin, a 27 kDa peptide that hydrolyzes the cell walls of several Staphylococcus species, principally S. aureus.[13] Subclass IIIb, in contrast, comprises those peptides that do not cause cell lysis, killing the target cells by disrupting plasma membrane potential.

Class IV bacteriocins

Class IV bacteriocins are defined as complex bacteriocins containing lipid or carbohydrate moieties. Confirmation by experimental data was established with the characterisation of sublancin and glycocin F (GccF) by two independent groups.[14][15]


Two databases of bacteriocins are available: BAGEL[16] and BACTIBASE.[17][18]


As of 2016, nisin was the only bacteriocin generally recognized as safe by the FDA and was used as a food preservative in several countries.[19] Generally bacteriocidins are not useful as food preservatives because they are expensive to make, are broken down in food products, they harm some proteins in food, and they target too narrow a range of microbes.[19]

Relevance to human health

Bacteriocins are made by non-pathogenic Lactobacilli in the vagina and help maintain the stability of the vaginal microbiome.[20]


Bacteriocins have been proposed as a replacement for antibiotics to which pathogenic bacteria have become resistant. Potentially, the bacteriocins could be produced by bacteria intentionally introduced into the patient to combat infection.[21] There are several strategies by which new bacteriocins can be discovered. In the past, bacteriocins had to be identified by intensive culture-based screening for antimicrobial activity against suitable targets and subsequently purified using fastidious methods prior to testing. However, since the advent of the genomic era, the availability of the bacterial genome sequences has revolutionized the approach to identifying bacteriocins. Recently developed in silico-based methods can be applied to rapidly screen thousands of bacterial genomes in order to identify novel antimicrobial peptides.[22]

As of 2014 some bacteriocins had been studied in in vitro studies to see if they can stop viruss from replicating, namely staphylococcin 188 against Newcastle disease virus, influenza virus, and coliphage HSA virus; each of enterocin AAR-71 class IIa, enterocin AAR-74 class IIa, and erwiniocin NA4 against coliphage HSA virus; each of enterocin ST5Ha, enterocin NKR-5-3C, and subtilosine against HSV-1; each of enterocin ST4V and enterocin CRL35 class IIa against HSV-1 and HSV-2; labyrinthopeptin A1 against HIV-1 and HSV-1; and bacteriocin from Lactobacillus delbrueckii against influenza virus.[23]

As of 2009, some bacteriocins, cytolysin, pyocyn S2, colicins A and E1, and the microcin MccE492 had been tested on cancer cell lines and in a mouse model of cancer.[24]

By name

  • acidocin
  • actagardine
  • agrocin
  • alveicin
  • aureocin
  • aureocin A53
  • aureocin A70
  • bisin
  • carnocin
  • carnocyclin
  • caseicin
  • cerein[25]
  • circularin A[26]
  • colicin
  • curvaticin
  • divercin
  • duramycin
  • enterocin
  • enterolysin
  • epidermin/gallidermin
  • erwiniocin
  • gardimycin
  • gassericin A[27]
  • glycinecin
  • halocin
  • haloduracin
  • klebicin
  • lactocin S[28]
  • lactococcin
  • lacticin
  • leucoccin
  • lysostaphin
  • macedocin
  • mersacidin
  • mesentericin
  • microbisporicin
  • microcin S
  • mutacin
  • nisin
  • paenibacillin
  • planosporicin
  • pediocin
  • pentocin
  • plantaricin
  • pneumocyclicin[29]
  • pyocin[30]
  • reutericin 6[31]
  • sakacin
  • salivaricin[32]
  • sublancin
  • subtilin
  • sulfolobicin
  • tasmancin[33]
  • thuricin 17
  • trifolitoxin
  • variacin
  • vibriocin
  • warnericin
  • warnerin

See also


  1. ^ Cotter, Paul D.; Ross, R. Paul; Hill, Colin (2012). "Bacteriocins — a viable alternative to antibiotics?". Nature Reviews Microbiology. 11 (2): 95–105. doi:10.1038/nrmicro2937. ISSN 1740-1526. PMID 23268227.
  2. ^ Gratia A (1925). "Sur un remarquable example d'antagonisme entre deux souches de colibacille". Compt. Rend. Soc. Biol. 93: 1040–2.
  3. ^ Gratia JP (October 2000). "André Gratia: a forerunner in microbial and viral genetics". Genetics. 156 (2): 471–6. PMC 1461273. PMID 11014798.
  4. ^ Cascales E, Buchanan SK, Duché D, et al. (March 2007). "Colicin Biology". Microbiol. Mol. Biol. Rev. 71 (1): 158–229. doi:10.1128/MMBR.00036-06. PMC 1847374. PMID 17347522.
  5. ^ Arnison PG, Bibb MJ, Bierbaum G, Bowers AA, Bugni TS, Bulaj G, Camarero JA, Campopiano DJ, Challis GL, Clardy J, Cotter PD, Craik DJ, Dawson M, Dittmann E, Donadio S, Dorrestein PC, Entian KD, Fischbach MA, Garavelli JS, Göransson U, Gruber CW, Haft DH, Hemscheidt TK, Hertweck C, Hill C, Horswill AR, Jaspars M, Kelly WL, Klinman JP, Kuipers OP, Link AJ, Liu W, Marahiel MA, Mitchell DA, Moll GN, Moore BS, Müller R, Nair SK, Nes IF, Norris GE, Olivera BM, Onaka H, Patchett ML, Piel J, Reaney MJ, Rebuffat S, Ross RP, Sahl HG, Schmidt EW, Selsted ME, Severinov K, Shen B, Sivonen K, Smith L, Stein T, Süssmuth RD, Tagg JR, Tang GL, Truman AW, Vederas JC, Walsh CT, Walton JD, Wenzel SC, Willey JM, van der Donk WA (2013). "Ribosomally synthesized and post-translationally modified peptide natural products: overview and recommendations for a universal nomenclature". Nat Prod Rep. 30 (1): 108–60. doi:10.1039/c2np20085f. PMC 3954855. PMID 23165928.
  6. ^ Eric Cascales and others, ‘Colicin Biology’, MICROBIOLOGY AND MOLECULAR BIOLOGY REVIEWS, 71.1 (2007), 158–229 <>.
  7. ^ Maarten G K Ghequire and René De Mot, 'Ribosomally Encoded Antibacterial Proteins and Peptides from Pseudomonas', FEMS Microbiology Reviews, 38.4 (2014), 523–68 <>.
  8. ^ Cotter PD, Hill C, Ross RP (2006). "What's in a name? Class distinction for bacteriocins". Nature Reviews Microbiology. 4 (2): 160. doi:10.1038/nrmicro1273-c2. is author reply to comment on article :Cotter PD, Hill C, Ross RP (2005). "Bacteriocins: developing innate immunity for food". Nature Reviews Microbiology. 3 (?): 777–88. doi:10.1038/nrmicro1273. PMID 16205711.
  9. ^ HENG, C. K. N., WESCOMBE, P. A., BURTON, J. P., JACK, R. W., & TAGG, J. R. (2007). The diversity of bacteriocins in Gram-positive bacteria. In: Bacteriocins: Ecology and Evolution. 1st ed., Riley, M. A. & Chavan, M. A., Eds. Springer, Hildberg, p. 45-83.
  10. ^ Nissen-Meyer, J; Rogne, P; OppegÃ¥rd, C; Haugen, HS; Kristiansen, PE (2013-08-12). "Structure-function relationships of the non-lanthionine-containing peptide (class II) bacteriocins produced by gram-positive bacteria". Curr Pharm Biotechnol. 10 (1): 19–37. doi:10.2174/138920109787048661. PMID 19149588.
  11. ^ NETZ D. J., POHL , BECK-SICKINGER A. G., SELMER , PIERIK , SAHL H. G. (2002). "Biochemical characterisation and genetic analysis of aureocin A53, a new, atypical bacteriocin from Staphylococcus aureus". J. Mol. Biol. 319 (3): 745–756. doi:10.1016/s0022-2836(02)00368-6. PMID 12054867.CS1 maint: uses authors parameter (link)
  12. ^ NETZ D. J. A., SAHL , NASCIMENTO , OLIVEIRA , SOARES , BASTOS M. C. F. (2001). "Molecular characterisation of aureocin A70, a multiple-peptide bacteriocin isolated from Staphylococcus aureus". J. Mol. Biol. 311 (5): 939–949. doi:10.1006/jmbi.2001.4885. PMID 11531330.CS1 maint: uses authors parameter (link)
  13. ^ Bastos M.C.F., Coutinho B.G., Coelho M.L.V. Lysostaphin: A Staphylococcal Bacteriolysin with Potential Clinical Applications. Pharmaceuticals. 2010; 3(4):1139-1161.
  14. ^ Oman T. J., Boettcher J. M., Wang H., Okalibe X. N., Van der Donk W. A (2011). "Sublancin is not a Lantibiotic but an s-Linked Glycopeptide". Nat Chem Biol. 7 (2): 78–80. doi:10.1038/nchembio.509. PMC 3060661. PMID 21196935.CS1 maint: uses authors parameter (link)
  15. ^ Stepper J.; Shastri S.; Loo T. S.; Preston J. C.; Novak P.; Man P.; Moore C. H.; Havlíček V.; Patchett M. L.; Norris G. E (2011). "Cysteine s-Glycosylation, A New Post-Translational Modification Found In Glycopeptide Bacteriocins". FEBS Letters. 585 (4): 645–650. doi:10.1016/j.febslet.2011.01.023. PMID 21251913.
  16. ^ de Jong A; van Hijum S A F T; Bijlsma J J E; Kok J; Kuipers O P (2006). "BAGEL: a web-based bacteriocin genome mining tool". Nucleic Acids Research. 34 (Web Server issue): W273–W279. doi:10.1093/nar/gkl237. PMC 1538908. PMID 16845009.
  17. ^ Hammami R, Zouhir A, Ben Hamida J, Fliss I (2007). "BACTIBASE: a new web-accessible database for bacteriocin characterization". BMC Microbiology. 7: 89. doi:10.1186/1471-2180-7-89. PMC 2211298. PMID 17941971.
  18. ^ Hammami R, Zouhir A, Le Lay C, Ben Hamida J, Fliss I (2010). "BACTIBASE second release: a database and tool platform for bacteriocin characterization". BMC Microbiology. 10: 22. doi:10.1186/1471-2180-10-22. PMC 2824694. PMID 20105292.
  19. ^ a b Fahim, Hazem A.; Khairalla, Ahmed S.; El-Gendy, Ahmed O. (2016-01-01). "Nanotechnology: A Valuable Strategy to Improve Bacteriocin Formulations". Frontiers in Microbiology. 7: 1385. doi:10.3389/fmicb.2016.01385. PMC 5026012. PMID 27695440.
  20. ^ Nardis, C.; Mastromarino, P.; Mosca, L. (Sep–Oct 2013). "Vaginal microbiota and viral sexually transmitted diseases". Annali di Igiene. 25 (5): 443–56. doi:10.7416/ai.2013.1946. PMID 24048183.
  21. ^ Cotter, PD; Ross, RP; Hill, C (February 2013). "Bacteriocins - a viable alternative to antibiotics?". Nature Reviews. Microbiology. 11 (2): 95–105. doi:10.1038/nrmicro2937. PMID 23268227.
  22. ^ Rezaei Javan, Reza; Van Tonder, Andries; King, James; Harrold, Caroline; Brueggemann, Angela (August 2018). "Genome Sequencing Reveals a Large and Diverse Repertoire of Antimicrobial Peptides". Frontiers in Microbiology. 2012 (9): 2012. doi:10.3389/fmicb.2018.02012. PMC 6120550. PMID 30210481.
  23. ^ Al Kassaa, I; Hober, D; Hamze, M; Chihib, NE; Drider, D (December 2014). "Antiviral potential of lactic acid bacteria and their bacteriocins". Probiotics and Antimicrobial Proteins. 6 (3–4): 177–85. doi:10.1007/s12602-014-9162-6. PMID 24880436.
  24. ^ Lagos, R; Tello, M; Mercado, G; García, V; Monasterio, O (January 2009). "Antibacterial and antitumorigenic properties of microcin E492, a pore-forming bacteriocin". Current Pharmaceutical Biotechnology. 10 (1): 74–85. doi:10.2174/138920109787048643. PMID 19149591.
  25. ^ Naclerio, G; Ricca, E; Sacco, M; De Felice, M (December 1993). "Antimicrobial activity of a newly identified bacteriocin of Bacillus cereus". Appl Environ Microbiol. 59 (12): 4313–6. PMC 195902. PMID 8285719.
  26. ^ Kawai Y, Kemperman R, Kok J, Saito T (2004). "The circular bacteriocins gassericin A and circularin A". Current Protein & Peptide Science. 5 (5): 393–8. doi:10.2174/1389203043379549. PMID 15544534.
  27. ^ Pandey N, Malik RK, Kaushik JK, Singroha G (2013). "Gassericin A: a circular bacteriocin produced by lactic acid bacteria Lactobacillus gasseri". World Journal of Microbiology & Biotechnology. 29 (11): 1977–87. doi:10.1007/s11274-013-1368-3. PMID 23712477.
  28. ^ Mørtvedt, C. I.; Nissen-Meyer, J.; Sletten, K.; Nes, I. F. (1991). "Purification and amino acid sequence of lactocin S, a bacteriocin produced by Lactobacillus sake L45". Applied and Environmental Microbiology. 57 (6): 1829–1834. PMC 183476. PMID 1872611.
  29. ^ Bogaardt, C.; van Tonder, A. J.; Brueggemann, A. (2015). "Genomic analyses of pneumococci reveal a wide diversity of bacteriocins – including pneumocyclicin, a novel circular bacteriocin". BMC Genomics. 16: 554. doi:10.1186/s12864-015-1729-4. PMC 4517551. PMID 26215050.
  30. ^ Michel-Briand, Y.; Baysse, C. (2002). "The pyocins of Pseudomonas aeruginosa". Biochimie. 84 (5–6): 499–510. doi:10.1016/s0300-9084(02)01422-0. PMID 12423794.
  31. ^ Kabuki T, Saito T, Kawai Y, Uemura J, Itoh T (1997). "Production, purification and characterization of reutericin 6, a bacteriocin with lytic activity produced by Lactobacillus reuteri LA6". International Journal of Food Microbiology. 34 (2): 145–56. doi:10.1016/s0168-1605(96)01180-4. PMID 9039561.
  32. ^ Wescombe, PA; Upton, M; Dierksen, KP; Ragland, NL; Sivabalan, S; Wirawan, RE; Inglis, MA; Moore, CJ; Walker, GV; Chilcott, CN; Jenkinson, HF; Tagg, JR (February 2006). "Production of the lantibiotic salivaricin A and its variants by oral streptococci and use of a specific induction assay to detect their presence in human saliva". Applied and Environmental Microbiology. 72 (2): 1459–66. doi:10.1128/aem.72.2.1459-1466.2006. PMC 1392966. PMID 16461700.
  33. ^ Müller, Ina; Lurz, Rudi; Geider, Klaus (25 July 2012). "Tasmancin and lysogenic bacteriophages induced from Erwinia tasmaniensis strains". Microbiological Research. 167 (7): 381–387. doi:10.1016/j.micres.2012.01.005. PMID 22381912.

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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.

Bacteriocin (Lactococcin_972) Provide feedback

These sequences represent bacteriocins related to lactococcin. Members tend to be found in association with a seven transmembrane putative immunity protein.

This tab holds annotation information from the InterPro database.

InterPro entry IPR006540

These sequences represent bacteriocins related to lactococcin 972 [ PUBMED:10589723 ]. Members tend to be found in association with a seven transmembrane putative immunity protein.

Domain organisation

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Seed source: TIGRFAMs
Previous IDs: none
Type: Family
Sequence Ontology: SO:0100021
Author: TIGRFAMs, Coggill P
Number in seed: 16
Number in full: 186
Average length of the domain: 63.50 aa
Average identity of full alignment: 28 %
Average coverage of the sequence by the domain: 56.02 %

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HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 57096847 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 22.0 22.0
Trusted cut-off 22.9 22.5
Noise cut-off 21.4 21.9
Model length: 63
Family (HMM) version: 12
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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 Lactococcin_972 domain has been found. There are 1 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 sequence.

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