1cx9
CRYSTAL STRUCTURE OF THE COMPLEX OF BACTERIAL TRYPTOPHAN SYNTHASE WITH THE TRANSITION STATE ANALOGUE INHIBITOR 4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACIDCRYSTAL STRUCTURE OF THE COMPLEX OF BACTERIAL TRYPTOPHAN SYNTHASE WITH THE TRANSITION STATE ANALOGUE INHIBITOR 4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACID
Structural highlights
Function[TRPA_SALTY] The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate. [TRPB_SALTY] The beta subunit is responsible for the synthesis of L-tryptophan from indole and L-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 PubMedIn an effort to use a structure-based approach for the design of new herbicides, the crystal structures of complexes of tryptophan synthase with a series of phosphonate enzyme inhibitors were determined at 2.3 A or higher resolution. These inhibitors were designed to mimic the transition state formed during the alpha-reaction of the enzyme and, as expected, have affinities much greater than that of the natural substrate indole-3-glycerol phosphate or its nonhydrolyzable analogue indole propanol phosphate (IPP). These inhibitors are ortho-substituted arylthioalkylphosphonate derivatives that have an sp(3)-hybridized sulfur atom, designed to mimic the putative tetrahedral transition state at the C3 atom of the indole, and lack the C2 atom to allow for higher conformational flexibility. Overall, the inhibitors bind in a fashion similar to that of IPP. Glu-49 and Phe-212 are the two active site residues whose conformation changes upon inhibitor binding. A very short hydrogen bond between a phosphonate oxygen and the Ser-235 hydroxyl oxygen may be responsible for stabilization of the enzyme-inhibitor complexes. Implications for the mechanism of catalysis as well as directions for more potent inhibitors are discussed. Crystallographic studies of phosphonate-based alpha-reaction transition-state analogues complexed to tryptophan synthase.,Sachpatzidis A, Dealwis C, Lubetsky JB, Liang PH, Anderson KS, Lolis E Biochemistry. 1999 Sep 28;38(39):12665-74. PMID:10504236[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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