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[[Image:2cla.jpg|left|200px]]
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[[Image:2cla.png|left|200px]]


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{{STRUCTURE_2cla|  PDB=2cla  |  SCENE=  }}  
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'''CRYSTAL STRUCTURE OF THE ASP-199-ASN MUTANT OF CHLORAMPHENICOL ACETYLTRANSFERASE TO 2.35 ANGSTROMS RESOLUTION. STRUCTURAL CONSEQUENCES OF DISRUPTION OF A BURIED SALT-BRIDGE'''
===CRYSTAL STRUCTURE OF THE ASP-199-ASN MUTANT OF CHLORAMPHENICOL ACETYLTRANSFERASE TO 2.35 ANGSTROMS RESOLUTION. STRUCTURAL CONSEQUENCES OF DISRUPTION OF A BURIED SALT-BRIDGE===




==Overview==
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The crystal structure of the Asp-199----Asn mutant of chloramphenicol acetyltransferase (CAT) has been determined to 2.35-A resolution. In wild-type CAT Asp-199 is involved in a fully buried intrasubunit salt bridge with Arg-18, an interaction that is adjacent to the active site. Replacement of aspartate with asparagine by site-directed mutagenesis disrupts this salt bridge and causes extensive conformational changes within the active site. The imidazole group of the catalytically essential His-195 is reoriented, with the loss of interactions thought to stabilize the preferred tautomer of this residue. Arg-18 and Asn-199 form three new intersubunit interactions as a result of large side-chain torsion angle changes which cause the movement of two polypeptide loops, some residues of which are up to 20 A away from the site of the mutation. The new interactions of Arg-18 and Asn-199 compensate for the loss of the buried salt bridge and afford near-wild-type thermostability to Asn-199 CAT, albeit with a greatly reduced activity.
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{{ABSTRACT_PUBMED_2271709}}


==About this Structure==
==About this Structure==
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[[Category: Leslie, A G.W.]]
[[Category: Leslie, A G.W.]]
[[Category: Moody, P C.E.]]
[[Category: Moody, P C.E.]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 22:24:54 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:33:47 2008''

Revision as of 06:33, 29 July 2008

File:2cla.png

Template:STRUCTURE 2cla

CRYSTAL STRUCTURE OF THE ASP-199-ASN MUTANT OF CHLORAMPHENICOL ACETYLTRANSFERASE TO 2.35 ANGSTROMS RESOLUTION. STRUCTURAL CONSEQUENCES OF DISRUPTION OF A BURIED SALT-BRIDGE

Template:ABSTRACT PUBMED 2271709

About this Structure

2CLA is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystal structure of the aspartic acid-199----asparagine mutant of chloramphenicol acetyltransferase to 2.35-A resolution: structural consequences of disruption of a buried salt bridge., Gibbs MR, Moody PC, Leslie AG, Biochemistry. 1990 Dec 25;29(51):11261-5. PMID:2271709

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