2bl7 | pdb_00002bl7

1.6 ANGSTROM CRYSTAL STRUCTURE OF ENTA-IM: A BACTERIAL IMMUNITY PROTEIN CONFERRING IMMUNITY TO THE ANTIMICROBIAL ACTIVITY OF THE PEDIOCIN-LIKE BACTERIOCIN, ENTEROCIN A

spinqualitylabelsall models 2bl7, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2bl7 is a 1 chain structure with sequence from Enterococcus faecium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: MSE Related: 2bl8 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Many Gram-positive bacteria produce ribosomally synthesized antimicrobial peptides, often termed bacteriocins. Genes encoding pediocin-like bacteriocins are generally cotranscribed with or in close vicinity to a gene encoding a cognate immunity protein that protects the bacteriocin-producer from their own bacteriocin. We present the first crystal structure of a pediocin-like immunity protein, EntA-im, conferring immunity to the bacteriocin enterocin A. Determination of the structure of this 103-amino acid protein revealed that it folds into an antiparallel four-helix bundle with a flexible C-terminal part. The fact that the immunity protein conferring immunity to carnobacteriocin B2 also consists of a four-helix bundle (Sprules, T., Kawulka, K. E., and Vederas, J. C. (2004) Biochemistry 43, 11740-11749) strongly indicates that this is a conserved structural motif in all pediocin-like immunity proteins. The C-terminal half of the immunity protein contains a region that recognizes the C-terminal half of the cognate bacteriocin, and the flexibility in the C-terminal end of the immunity protein might thus be an important characteristic that enables the immunity protein to interact with its cognate bacteriocin. By homology modeling of three other pediocin-like immunity proteins and calculation of the surface charge distribution for EntA-im and the three structure models, different charge distributions were observed. The differences in the latter part of helix 3, the beginning of helix 4, and the loop connecting these helices might also be of importance in determining the specificity. 1.6-Angstroms crystal structure of EntA-im. A bacterial immunity protein conferring immunity to the antimicrobial activity of the pediocin-like bacteriocin enterocin A.,Johnsen L, Dalhus B, Leiros I, Nissen-Meyer J J Biol Chem. 2005 May 13;280(19):19045-50. Epub 2005 Mar 7. PMID:15753083 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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