- Source: T-A hol family
The Putative 3-4 TMS Transglycosylase-associated Holin (T-A Hol) Family (TC# 1.E.43) is believed to be a group of holins that does not belong to one of the seven holin superfamilies. Homologues include thousands of diverse phage and bacterial proteins between 80 and 140 amino acyl residues (aas) in length that exhibit 3 to 4 transmembrane segments (TMSs). These proteins are holin-like in their size and topology and are designated 'Transglycosylase-associated', 'Putative holin', 'Phage-like transmembrane protein', 'YeaQ protein', etc. in the NCBI protein database. As of early 2016, they remain functionally uncharacterized. They derive from a wide range of bacterial and archaeal phyla including both Gram-negative and Gram-positive bacteria. These proteins are related to the RDD family (TC# 9.B.45) in the conserved domain database. A representative list of proteins belonging to the T-A Hol family can be found in the Transporter Classification Database.
See also
Holin
Lysin
Transporter Classification Database
Further reading
Reddy, BL; Saier, MH (2013). "Topological and phylogenetic analyses of bacterial holin families and superfamilies". Biochim. Biophys. Acta. 1828 (11): 2654–71. doi:10.1016/j.bbamem.2013.07.004. PMC 3788059. PMID 23856191..
Saier, MH; Reddy, BL (2015). "Holins in bacteria, eukaryotes, and archaea: multifunctional xenologues with potential biotechnological and biomedical applications". J. Bacteriol. 197 (1): 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..
Young, R; Bläsi, U (1995). "Holins: form and function in bacteriophage lysis". FEMS Microbiol. Rev. 17 (1–2): 191–205. doi:10.1111/j.1574-6976.1995.tb00202.x. PMID 7669346..
References
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