1x60
From Proteopedia
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Solution structure of the peptidoglycan binding domain of B. subtilis cell wall lytic enzyme CwlC
Overview
Bacillus subtilis CwlC is a cell wall lytic N-acetylmuramoyl-l-alanine, amidase that plays an important role in mother-cell lysis during, sporulation. The enzyme consists of an N-terminal catalytic domain with, C-terminal tandem repeats. The repeats [repeat 1 (residues 184-219) and, repeat 2 (residues 220-255)] are termed CwlCr. We report on the solution, structure of CwlCr as determined by multidimensional NMR, including the, use of 36 (h3)J(NC)'-derived hydrogen bond restraints and 64 residual, (1)D(NH) dipolar couplings. Two tandem repeats fold into a pseudo-2-fold, symmetric single-domain structure consisting of a, betaalphabetabetaalphabeta-fold containing numerous contacts between the, repeats. Hydrophobic residues important for structural integrity are, conserved between the repeats, and are located symmetrically. We also, present NMR analysis of the circularly permuted repeat mutant of CwlCr., Secondary structure content from the chemical shifts and hydrogen bonds, derived from (h3)J(NC)' show that the mutant folds into a structure, similar to that of the wild type, suggesting that the repeats are, exchangeable. This implies that conserved hydrophobic residues are crucial, for maintaining the folding of the repeats. While monitoring the chemical, shift perturbations following the addition of digested soluble, peptidoglycan fragments, we identified two peptidoglycan interaction sites, of CwlCr at the edges of the protein symmetrically, and they are located, approximately 28 A from each other.
About this Structure
1X60 is a Single protein structure of sequence from Bacillus subtilis. Active as N-acetylmuramoyl-L-alanine amidase, with EC number 3.5.1.28 Full crystallographic information is available from OCA.
Reference
Solution structure of the peptidoglycan binding domain of Bacillus subtilis cell wall lytic enzyme CwlC: characterization of the sporulation-related repeats by NMR., Mishima M, Shida T, Yabuki K, Kato K, Sekiguchi J, Kojima C, Biochemistry. 2005 Aug 2;44(30):10153-63. PMID:16042392
Page seeded by OCA on Wed Nov 21 05:51:22 2007
