1szx

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{{STRUCTURE_1szx| PDB=1szx | SCENE= }}
{{STRUCTURE_1szx| PDB=1szx | SCENE= }}
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'''Role Of Hydrogen Bonding In The Active Site Of Human Manganese Superoxide Dismutase'''
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===Role Of Hydrogen Bonding In The Active Site Of Human Manganese Superoxide Dismutase===
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==Overview==
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The side chain of Gln143, a conserved residue in manganese superoxide dismutase (MnSOD), forms a hydrogen bond with the manganese-bound solvent and is critical in maintaining catalytic activity. The side chains of Tyr34 and Trp123 form hydrogen bonds with the carboxamide of Gln143. We have replaced Tyr34 and Trp123 with Phe in single and double mutants of human MnSOD and measured their catalytic activity by stopped-flow spectrophotometry and pulse radiolysis. The replacements of these side chains inhibited steps in the catalysis as much as 50-fold; in addition, they altered the gating between catalysis and formation of a peroxide complex to yield a more product-inhibited enzyme. The replacement of both Tyr34 and Trp123 in a double mutant showed that these two residues interact cooperatively in maintaining catalytic activity. The crystal structure of Y34F/W123F human MnSOD at 1.95 A resolution suggests that this effect is not related to a conformational change in the side chain of Gln143, which does not change orientation in Y34F/W123F, but rather to more subtle electronic effects due to the loss of hydrogen bonding to the carboxamide side chain of Gln143. Wild-type MnSOD containing Trp123 and Tyr34 has approximately the same thermal stability compared with mutants containing Phe at these positions, suggesting the hydrogen bonds formed by these residues have functional rather than structural roles.
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{{ABSTRACT_PUBMED_15170341}}
==About this Structure==
==About this Structure==
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[[Category: Tainer, J A.]]
[[Category: Tainer, J A.]]
[[Category: Mnsod manganese superoxide dismutase]]
[[Category: Mnsod manganese superoxide dismutase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:19:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:31:33 2008''

Revision as of 06:31, 28 July 2008

Image:1szx.png

Template:STRUCTURE 1szx

Role Of Hydrogen Bonding In The Active Site Of Human Manganese Superoxide Dismutase

Template:ABSTRACT PUBMED 15170341

About this Structure

1SZX is a Single protein structure of sequence from Homo sapiens. This structure supersedes the now removed PDB entry 1rfw. Full crystallographic information is available from OCA.

Reference

Role of hydrogen bonding in the active site of human manganese superoxide dismutase., Greenleaf WB, Perry JJ, Hearn AS, Cabelli DE, Lepock JR, Stroupe ME, Tainer JA, Nick HS, Silverman DN, Biochemistry. 2004 Jun 8;43(22):7038-45. PMID:15170341

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