1mqx
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(New page: 200px<br /><applet load="1mqx" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mqx" /> '''NMR Solution Structure of Type-B Lantibiotic...)
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Revision as of 19:44, 24 November 2007
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NMR Solution Structure of Type-B Lantibiotics Mersacidin in MeOH/H2O Mixture
Overview
Mersacidin belongs to the type B lantibiotics (lanthionine-containing, antibiotics) that contain post-translationally modified amino acids and, cyclic ring structures. It targets the cell wall precursor lipid II and, thereby inhibits cell wall synthesis. In light of the emerging antibiotics, resistance problem, the understanding of the antibacterial activity on a, structural basis provides a key to circumvent this issue. Here we present, solution NMR studies of mersacidin-lipid II interaction in, dodecylphosphocholine (DPC) micelles. Distinct solution structures of, mersacidin were determined in three different states: in water/methanol, solution and in DPC micelles with and without lipid II. The structures in, various sample conditions reveal remarkable conformational changes in, which the junction between Ala-12 and Abu-13 (where Abu is aminobutyric, acid) effectively serves as the hinge for the opening and closure of the, ring structures. The DPC micelle-bound form resembles the previously, determined NMR and x-ray crystal structures of mersacidin in pure methanol, but substantially deviates from the other two states in our current, report. The structural changes delineate the large chemical shift, perturbations observed during the course of a two-step (15)N-(1)H, heteronuclear single quantum coherence titration. They also modulate the, surface charge distribution of mersacidin suggesting that electrostatics, play a central role in the mersacidin-lipid II interaction. The observed, conformational adaptability of mersacidin might be a general feature of, lipid II-interacting antibiotics/peptides.
About this Structure
1MQX is a Single protein structure of sequence from Bacillus sp.. Full crystallographic information is available from OCA.
Reference
NMR study of mersacidin and lipid II interaction in dodecylphosphocholine micelles. Conformational changes are a key to antimicrobial activity., Hsu ST, Breukink E, Bierbaum G, Sahl HG, de Kruijff B, Kaptein R, van Nuland NA, Bonvin AM, J Biol Chem. 2003 Apr 11;278(15):13110-7. Epub 2003 Jan 31. PMID:12562773
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