1qf7

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{{STRUCTURE_1qf7| PDB=1qf7 | SCENE= }}
{{STRUCTURE_1qf7| PDB=1qf7 | SCENE= }}
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'''STRUCTURE OF THE MUTANT HIS392GLN OF CATALASE HPII FROM E. COLI'''
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===STRUCTURE OF THE MUTANT HIS392GLN OF CATALASE HPII FROM E. COLI===
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==Overview==
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The three-dimensional structures of two HPII variants, V169C and H392Q, have been determined at resolutions of 1.8 and 2.1 A, respectively. The V169C variant contains a new type of covalent bond between the sulfur atom of Cys(169) and a carbon atom on the imidazole ring of the essential His(128). This variant enzyme has only residual catalytic activity and contains heme b. The chain of water molecules visible in the main channel may reflect the organization of the hydrogen peroxide substrates in the active enzyme. Two alternative mechanisms, involving either compound I or free radical intermediates, are presented to explain the formation of the Cys-His covalent bond. The H392Q and H392E variants exhibit 75 and 25% of native catalytic activity, respectively. The Gln(392) variant contains only heme b, whereas the Glu(392) variant contains a mixture of heme b and cis and trans isomers of heme d, suggesting of a role for this residue in heme conversion. Replacement of either Gln(419) and Ser(414), both of which interact with the heme, affected the cis:trans ratio of spirolactone heme d. Implications for the heme oxidation mechanism and the His-Tyr bond formation in HPII are considered.
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(as it appears on PubMed at http://www.pubmed.gov), where 10488114 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10488114}}
==About this Structure==
==About this Structure==
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[[Category: Covalent modification]]
[[Category: Covalent modification]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:11:39 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 13:36:54 2008''

Revision as of 10:37, 27 July 2008

Image:1qf7.png

Template:STRUCTURE 1qf7

STRUCTURE OF THE MUTANT HIS392GLN OF CATALASE HPII FROM E. COLI

Template:ABSTRACT PUBMED 10488114

About this Structure

1QF7 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Mutants that alter the covalent structure of catalase hydroperoxidase II from Escherichia coli., Mate MJ, Sevinc MS, Hu B, Bujons J, Bravo J, Switala J, Ens W, Loewen PC, Fita I, J Biol Chem. 1999 Sep 24;274(39):27717-25. PMID:10488114

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