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1w5r

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[[Image:1w5r.gif|left|200px]]
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{{STRUCTURE_1w5r| PDB=1w5r | SCENE= }}
{{STRUCTURE_1w5r| PDB=1w5r | SCENE= }}
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'''X-RAY CRYSTALLOGRAPHIC STRCUTURE OF A C70Q MYCOBACTERIUM SMEGMATIS N-ARYLAMINE ACETYLTRANSFERASE'''
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===X-RAY CRYSTALLOGRAPHIC STRCUTURE OF A C70Q MYCOBACTERIUM SMEGMATIS N-ARYLAMINE ACETYLTRANSFERASE===
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==Overview==
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The NATs (arylamine N-acetyltransferases) are a well documented family of enzymes found in both prokaryotes and eukaryotes. NATs are responsible for the acetylation of a range of arylamine, arylhydrazine and hydrazine compounds. We present here an investigation into the catalytic triad of residues (Cys-His-Asp) and other structural features of NATs using a variety of methods, including site-directed mutagenesis, X-ray crystallography and bioinformatics analysis, in order to investigate whether each of the residues of the catalytic triad is essential for catalytic activity. The catalytic triad of residues, Cys-His-Asp, is a well defined motif present in several families of enzymes. We mutated each of the catalytic residues in turn to investigate the role they play in catalysis. We also mutated a key residue, Gly126, implicated in acetyl-CoA binding, to examine the effects on acetylation activity. In addition, we have solved the structure of a C70Q mutant of Mycobacterium smegmatis NAT to a resolution of 1.45 A (where 1 A=0.1 nm). This structure confirms that the mutated protein is correctly folded, and provides a structural model for an acetylated NAT intermediate. Our bioinformatics investigation analysed the extent of sequence conservation between all eukaryotic and prokaryotic NAT enzymes for which sequence data are available. This revealed several new sequences, not yet reported, of NAT paralogues. Together, these studies have provided insight into the fundamental core of NAT enzymes, and the regions where sequence differences account for the functional diversity of this family. We have confirmed that each of the three residues of the triad is essential for acetylation activity.
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{{ABSTRACT_PUBMED_15869465}}
==About this Structure==
==About this Structure==
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[[Category: Acyltransferase]]
[[Category: Acyltransferase]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:11:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 01:45:33 2008''

Revision as of 22:45, 28 July 2008

Image:1w5r.png

Template:STRUCTURE 1w5r

X-RAY CRYSTALLOGRAPHIC STRCUTURE OF A C70Q MYCOBACTERIUM SMEGMATIS N-ARYLAMINE ACETYLTRANSFERASE

Template:ABSTRACT PUBMED 15869465

About this Structure

1W5R is a Single protein structure of sequence from Mycobacterium smegmatis. Full crystallographic information is available from OCA.

Reference

Investigation of the catalytic triad of arylamine N-acetyltransferases: essential residues required for acetyl transfer to arylamines., Sandy J, Mushtaq A, Holton SJ, Schartau P, Noble ME, Sim E, Biochem J. 2005 Aug 15;390(Pt 1):115-23. PMID:15869465

Page seeded by OCA on Tue Jul 29 01:45:33 2008

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