1bd0

ALANINE RACEMASE COMPLEXED WITH ALANINE PHOSPHONATE

spinqualitylabelsall models 1bd0, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1bd0 is a 2 chain structure with sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: IN5 Activity: Alanine racemase, with EC number 5.1.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ALR_GEOSE] Catalyzes the interconversion of L-alanine and D-alanine. Also weakly active on serine. 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 (R)-1-Aminoethylphosphonic acid (L-Ala-P), a synthetic L-alanine analogue, has antibacterial activity and is a time-dependent inactivator of all purified Gram-positive bacterial alanine racemases that have been tested. L-Ala-P forms an external aldimine with the bound pyridoxal 5'-phosphate (PLP) cofactor, but is neither racemized nor efficiently hydrolyzed. To understand the structural basis of the inactivation of the enzyme by L-Ala-P, we determined the crystal structure of the complex between L-Ala-P and alanine racemase at 1.6 A resolution. The cofactor derivative in the inhibited structure tilts outward from the protein approximately 20 degrees relative to the internal aldimine. The phosphonate oxygens are within hydrogen bonding distance of four amino acid residues and two water molecules in the active site of the enzyme. L-Ala-P is an effective inhibitor of alanine racemase because, upon formation of the external aldimine, the phosphonate group interacts with putative catalytic residues, thereby rendering them unavailable for catalysis. Furthermore, this aldimine appears to be inappropriately aligned for efficient Calpha proton abstraction. The combination of these effects leads to a stable aldimine derivative and potent inactivation of alanine racemase by this compound. Reaction of alanine racemase with 1-aminoethylphosphonic acid forms a stable external aldimine.,Stamper GF, Morollo AA, Ringe D Biochemistry. 1998 Jul 21;37(29):10438-45. PMID:9671513 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Alanine racemase 3D structures

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