A2 holin family

The Putative Archaeal 2 TMS Holin (A2-Hol) Family (TC# 9.B.109) consists of a few putative holins from Nitrososphaerota ranging in size from about 130 to 165 amino acyl residues (aas) and exhibiting 2 transmembrane segments (TMSs). A representative list of proteins belonging to the A2-Hol family can be found in the Transporter Classification Database. The archaeon, Candidatus Nitrosoarchaeum limnia, encodes adjacent genes designated Toxin Secretion/Lysis Holin. The "toxin" gene encodes a soluble protein of 325 aas stated as belonging to the "Glycosyltransferase GBT-type Superfamily". This protein brings up other glycosyltransferases in a NCBI BLAST search. The adjacent gene encodes a small protein of 132 aas and 2 TMSs (TC# 9.B.109.1.1) that could be a holin, based on its size and topology. This protein has the UniProt accession number of S2E3C4. Paralogues are found in this same organism (Candidatus Nitrosoarchaeum koreensis) and other closely related species.^[1]

• Holin
• Lysin
• Transporter Classification Database

• Saier, MH; Reddy, BL (2015). "Holins in bacteria, eukaryotes, and archaea: multifunctional xenologues with potential biotechnological and biomedical applications". J. Bacteriol. 197: 7–17. doi:10.1128/JB.02046-14. PMC 4288690. PMID 25157079..
• Wang, IN; Smith, DL; Young, R (2000). "Holins: the protein clocks of bacteriophage infections". Annu. Rev. Microbiol. 54: 799–825. doi:10.1146/annurev.micro.54.1.799. PMID 11018145..

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