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1gsu

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{{STRUCTURE_1gsu| PDB=1gsu | SCENE= }}
{{STRUCTURE_1gsu| PDB=1gsu | SCENE= }}
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'''AN AVIAN CLASS-MU GLUTATHIONE S-TRANSFERASE, CGSTM1-1 AT 1.94 ANGSTROM RESOLUTION'''
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===AN AVIAN CLASS-MU GLUTATHIONE S-TRANSFERASE, CGSTM1-1 AT 1.94 ANGSTROM RESOLUTION===
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==Overview==
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Glutathione S-transferase cGSTM1-1, an avian class-mu enzyme with high sequence identity with rGSTM3-3, was expressed heterologously in Escherichia coli. The three-dimensional structure of this protein that co-crystallized with an inhibitor, S-hexylglutathione, was determined by the molecular replacement method and refined to 1.94 A resolution. The three-dimensional structure and the folding topology of the dimeric cGSTM1-1 closely resembles those of other class-mu GSTs. The bound inhibitor, S-hexylglutathione, orients in disparate directions in the two subunits. The combined space occupied by the hexyl moiety of the inhibitors overlaps with that reported for rGSTM1-1 co-crystallized with (9 S,10 S)-9-(S-glutathionyl)-10-hydroxy-9,10-dihydrophenanthrene. Conformational differences at a flexible loop (residue 35 to 40) were also observed between the crystal structures of cGSTM1-1 and rGSTM1-1.cGSTM1-1 has the highest epoxidase activity among all the class-mu enzymes reported. Tyr115, has been identified as a residue that participates in the epoxidase activity of class-mu glutathione S-transferase and is conserved in cGSTM1-1. The epoxidase and trans-4-phenyl-3-buten-2-one conjugating activity of cGSTM1-1 are decreased drastically but not abolished by replacing Tyr115 with phenylalanine. The specificity constant of the cGSTM1-1(Y115F) mutant, with 1-chloro-2,4-dinitrobenzene as substrate, is 15-fold higher than that of the wild-type enzyme.
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{{ABSTRACT_PUBMED_9571047}}
==About this Structure==
==About this Structure==
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[[Category: Glutathione s-transferase]]
[[Category: Glutathione s-transferase]]
[[Category: S-hexyl glutathione]]
[[Category: S-hexyl glutathione]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 17:57:54 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:01:06 2008''

Revision as of 03:01, 1 July 2008

Image:1gsu.png

Template:STRUCTURE 1gsu

AN AVIAN CLASS-MU GLUTATHIONE S-TRANSFERASE, CGSTM1-1 AT 1.94 ANGSTROM RESOLUTION

Template:ABSTRACT PUBMED 9571047

About this Structure

1GSU is a Single protein structure of sequence from Gallus gallus. Full crystallographic information is available from OCA.

Reference

The three-dimensional structure of an avian class-mu glutathione S-transferase, cGSTM1-1 at 1.94 A resolution., Sun YJ, Kuan IC, Tam MF, Hsiao CD, J Mol Biol. 1998 Apr 24;278(1):239-52. PMID:9571047

Page seeded by OCA on Tue Jul 1 06:01:06 2008

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