2dab

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{{STRUCTURE_2dab| PDB=2dab | SCENE= }}
{{STRUCTURE_2dab| PDB=2dab | SCENE= }}
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'''L201A MUTANT OF D-AMINO ACID AMINOTRANSFERASE COMPLEXED WITH PYRIDOXAL-5'-PHOSPHATE'''
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===L201A MUTANT OF D-AMINO ACID AMINOTRANSFERASE COMPLEXED WITH PYRIDOXAL-5'-PHOSPHATE===
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==Overview==
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The leucine-to-alanine mutation at residue 201 of D-amino acid aminotransferase provides a unique enzyme which gradually loses its activity while catalyzing the normal transamination; the co-enzyme form is converted from pyridoxal 5'-phosphate to pyridoxamine 5'-phosphate upon the inactivation [Kishimoto,K., Yoshimura,T., Esaki,N., Sugio,S., Manning,J.M. and Soda,K. (1995) J. Biochem., 117, 691-696]. Crystal structures of both co-enzyme forms of the mutant enzyme have been determined at 2.0 A resolution: they are virtually identical, and are quite similar to that of the wild-type enzyme. Significant differences in both forms of the mutant are localized only on the bound co-enzyme, the side chains of Lys145 and Tyr31, and a water molecule sitting on the putative substrate binding site. Detailed comparisons of the structures of the mutant, together with that of the pyridoxamine-5'-phosphate form of the wild-type enzyme, imply that Leu201 would play a crucial role in the transamination reaction by keeping the pyridoxyl ring in the proper location without disturbing its oscillating motion, although the residue seems to not be especially important for the structural integrity of the enzyme.
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{{ABSTRACT_PUBMED_9749913}}
==About this Structure==
==About this Structure==
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[[Category: Pyridoxal-5'-phosphate]]
[[Category: Pyridoxal-5'-phosphate]]
[[Category: Transferase]]
[[Category: Transferase]]
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Revision as of 03:31, 28 July 2008

Image:2dab.png

Template:STRUCTURE 2dab

L201A MUTANT OF D-AMINO ACID AMINOTRANSFERASE COMPLEXED WITH PYRIDOXAL-5'-PHOSPHATE

Template:ABSTRACT PUBMED 9749913

About this Structure

2DAB is a Single protein structure of sequence from Bacillus sp.. Full crystallographic information is available from OCA.

Reference

Crystal structures of L201A mutant of D-amino acid aminotransferase at 2.0 A resolution: implication of the structural role of Leu201 in transamination., Sugio S, Kashima A, Kishimoto K, Peisach D, Petsko GA, Ringe D, Yoshimura T, Esaki N, Protein Eng. 1998 Aug;11(8):613-9. PMID:9749913

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