BlyA, a small holin found in Borrelia circular plasmids that is encoded by a prophage. BlyA contains two largely hydrophobic helices and a highly charged C-terminus and has two transmembrane segments [1].

1: Characterization of Borrelia burgdorferi BlyA and BlyB proteins: a prophage-encoded holin-like system. Damman CJ, Eggers CH, Samuels DS, Oliver DB; J Bacteriol 2000;182:6791-6797. PMID:11073925

2: Release of latent ClyA cytolysin from Escherichia coli mediated by a bacteriophage-associated putative holin (BlyA) from Borrelia burgdorferi. Ludwig A, von Rhein C, Mischke A, Brade V; Int J Med Microbiol. 2008;298:473-481. PMID:17897882