1cx9

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{{STRUCTURE_1cx9| PDB=1cx9 | SCENE= }}
{{STRUCTURE_1cx9| PDB=1cx9 | SCENE= }}
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'''CRYSTAL STRUCTURE OF THE COMPLEX OF BACTERIAL TRYPTOPHAN SYNTHASE WITH THE TRANSITION STATE ANALOGUE INHIBITOR 4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACID'''
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===CRYSTAL STRUCTURE OF THE COMPLEX OF BACTERIAL TRYPTOPHAN SYNTHASE WITH THE TRANSITION STATE ANALOGUE INHIBITOR 4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACID===
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==Overview==
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In 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.
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(as it appears on PubMed at http://www.pubmed.gov), where 10504236 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10504236}}
==About this Structure==
==About this Structure==
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[[Category: 8-fold alpha-beta barrel]]
[[Category: 8-fold alpha-beta barrel]]
[[Category: Enzyme-inhibitor complex]]
[[Category: Enzyme-inhibitor complex]]
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Revision as of 18:42, 30 June 2008

Image:1cx9.png

Template:STRUCTURE 1cx9

CRYSTAL STRUCTURE OF THE COMPLEX OF BACTERIAL TRYPTOPHAN SYNTHASE WITH THE TRANSITION STATE ANALOGUE INHIBITOR 4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACID

Template:ABSTRACT PUBMED 10504236

About this Structure

1CX9 is a Protein complex structure of sequences from Salmonella typhimurium. Full crystallographic information is available from OCA.

Reference

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

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