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From Proteopedia
Crystal Structure of Bacillus cereus D-alanyl Carrier Protein Ligase DltA in Complex with ATP: Implications for Adenylation Mechanism
Structural highlights
FunctionDLTA_BACCR Involved in the biosynthesis of D-alanyl-lipoteichoic acid (LTA). Catalyzes an ATP-dependent two-step reaction where it forms a high energy D-alanyl AMP intermediate and transfers the alanyl residues from AMP to Dcp (By similarity). 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 PubMedD-alanylation of lipoteichoic acids modulates the surface charge and ligand binding of the Gram-positive cell wall. Disruption of the bacterial dlt operon involved in teichoic acid alanylation, as well as inhibition of the DltA (D-alanyl carrier protein ligase) protein, has been shown to render the bacterium more susceptible to conventional antibiotics and host defense responses. The DltA catalyzes the adenylation and thiolation reactions of d-alanine. This enzyme belongs to a superfamily of AMP-forming domains such as the ubiquitous acetyl-coenzyme A synthetase. We have determined the 1.9-A-resolution crystal structure of a DltA protein from Bacillus cereus in complex with ATP. This structure sheds light on the geometry of the bound ATP. The invariant catalytic residue Lys492 appears to be mobile, suggesting a molecular mechanism of catalysis for this superfamily of enzymes. Specific roles are also revealed for two other invariant residues: the divalent cation-stabilizing Glu298 and the beta-phosphate-interacting Arg397. Mutant proteins with a glutamine substitution at position 298 or 397 are inactive. Crystal structure of Bacillus cereus D-alanyl carrier protein ligase (DltA) in complex with ATP.,Osman KT, Du L, He Y, Luo Y J Mol Biol. 2009 May 1;388(2):345-55. Epub 2009 Mar 24. PMID:19324056[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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