2dln
VANCOMYCIN RESISTANCE: STRUCTURE OF D-ALANINE:D-ALANINE LIGASE AT 2.3 ANGSTROMS RESOLUTION
OverviewOverview
The molecular structure of the D-alanine:D-alanine ligase of the ddlB gene of Escherichia coli, co-crystallized with an S,R-methylphosphinate and adenosine triphosphate, was determined by x-ray diffraction to a resolution of 2.3 angstroms. A catalytic mechanism for the ligation of two D-alanine substrates is proposed in which a helix dipole and a hydrogen-bonded triad of tyrosine, serine, and glutamic acid assist binding and deprotonation steps. From sequence comparison, it is proposed that a different triad exists in a recently discovered D-alanine:D-lactate ligase (VanA) present in vancomycin-resistant enterococci. A molecular mechanism for the altered specificity of VanA is suggested.
About this StructureAbout this Structure
2DLN is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
Vancomycin resistance: structure of D-alanine:D-alanine ligase at 2.3 A resolution., Fan C, Moews PC, Walsh CT, Knox JR, Science. 1994 Oct 21;266(5184):439-43. PMID:7939684 Page seeded by OCA on Sun May 4 00:41:19 2008