1qnl
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(New page: 200px<br /><applet load="1qnl" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qnl, resolution 2.7Å" /> '''AMIDE RECEPTOR/NEGATI...)
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Revision as of 22:42, 20 November 2007
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AMIDE RECEPTOR/NEGATIVE REGULATOR OF THE AMIDASE OPERON OF PSEUDOMONAS AERUGINOSA (AMIC) COMPLEXED WITH BUTYRAMIDE
Overview
The AmiC protein in Pseudomonas aeruginosa is the negative regulator and, ligand receptor for an amide-inducible aliphatic amidase operon. In the, wild-type PAC1 strain, amidase expression is induced by acetamide or, lactamide, but not by butyramide. A mutant strain of P. aeruginosa, PAC181, was selected for its sensitivity to induction by butyramide. The, molecular basis for the butyramide inducible phenotype of P.aeruginosa, PAC181 has now been determined, and results from a Thr-->Asn mutation at, position 106 in PAC181-AmiC. In the wild-type PAC1-AmiC protein this, residue forms part of the side wall of the amide-binding pocket but does, not interact with the acetamide ligand directly. In the crystal structure, of PAC181-AmiC complexed with butyramide, the Thr-->Asn mutation increases, the size of the ligand binding site such that the mutant protein is able, to close into its 'on' configuration even in the presence of butyramide., Although the mutation allows butyramide to be recognized as an inducer of, amidase expression, the mutation is structurally sub-optimal, and produces, a significant decrease in the stability of the mutant protein.
About this Structure
1QNL is a Single protein structure of sequence from Pseudomonas aeruginosa with BMD as ligand. Full crystallographic information is available from OCA.
Reference
Structural adaptation to selective pressure for altered ligand specificity in the Pseudomonas aeruginosa amide receptor, amiC., O'Hara BP, Wilson SA, Lee AW, Roe SM, Siligardi G, Drew RE, Pearl LH, Protein Eng. 2000 Feb;13(2):129-32. PMID:10708652
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