1qnl

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{{STRUCTURE_1qnl| PDB=1qnl | SCENE= }}
{{STRUCTURE_1qnl| PDB=1qnl | SCENE= }}
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'''AMIDE RECEPTOR/NEGATIVE REGULATOR OF THE AMIDASE OPERON OF PSEUDOMONAS AERUGINOSA (AMIC) COMPLEXED WITH BUTYRAMIDE'''
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===AMIDE RECEPTOR/NEGATIVE REGULATOR OF THE AMIDASE OPERON OF PSEUDOMONAS AERUGINOSA (AMIC) COMPLEXED WITH BUTYRAMIDE===
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==Overview==
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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--&gt;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--&gt;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.
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{{ABSTRACT_PUBMED_10708652}}
==About this Structure==
==About this Structure==
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[[Category: Gene regulator]]
[[Category: Gene regulator]]
[[Category: Receptor]]
[[Category: Receptor]]
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Revision as of 15:57, 28 July 2008

Image:1qnl.png

Template:STRUCTURE 1qnl

AMIDE RECEPTOR/NEGATIVE REGULATOR OF THE AMIDASE OPERON OF PSEUDOMONAS AERUGINOSA (AMIC) COMPLEXED WITH BUTYRAMIDE

Template:ABSTRACT PUBMED 10708652

About this Structure

1QNL is a Single protein structure of sequence from Pseudomonas aeruginosa. 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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