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Publication Abstract from PubMed

Bacteriocin-producing lactic acid bacteria (LAB) possess a self-protection factor, which is generally called an immunity protein. In this study, we determine the crystal structure of an immunity protein, designated Mun-im, which was classified into subgroup B immunity proteins for class IIa bacteriocins. The Mun-im protein takes a left-turning antiparallel four-helix bundle structure with the flexible N- and C-terminal parts. Although the amino acid sequences of the subgroup B immunity proteins are distinguished from those of the subgroup A, the core structure of Mun-im is well-superimposed with that of the subgroup A immunity protein, EntA-im, and the C-terminus of both proteins is flexible. However, the C-terminus of Mun-im is obviously shorter than that of the subgroup A. We found through mutagenic study of Mun-im that the C-terminus and the K86 residue on the helix 4 in the immunity protein molecule are important for expression of the immunity activity on the subgroup B immunity proteins.

Crystal structure and mutagenic analysis of a bacteriocin immunity protein, Mun-im.,Jeon HJ, Noda M, Matoba Y, Kumagai T, Sugiyama M Biochem Biophys Res Commun. 2009 Jan 16;378(3):574-8. Epub 2008 Dec 4. PMID:19061861^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.