1goh: Difference between revisions

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NOVEL THIOETHER BOND REVEALED BY A 1.7 ANGSTROMS CRYSTAL STRUCTURE OF GALACTOSE OXIDASE

OverviewOverview

Galactose oxidase is an extracellular enzyme secreted by the fungus Dactylium dendroides. It is monomeric, with a relative molecular mass of 68,000, catalyses the stereospecific oxidation of a broad range of primary alcohol substrates and possesses a unique mononuclear copper site essential for catalysing a two-electron transfer reaction during the oxidation of primary alcohols to corresponding aldehydes. Recent evidence arguing against a Cu(III)-Cu(I) couple implies the existence of a second redox-active site proposed to involve pyrroloquinoline quinone or a tyrosine radical. We now report the crystal structure of galactose oxidase at 1.7 A resolution. This reveals a unique structural feature at the copper site with a novel thioether bond linking Cys 228 and Tyr 272 in a stacking interaction with Trp 290. We propose that these molecular components stabilize the protein free-radical species essential for catalysis and thus provide a 'built-in' secondary cofactor. This feature may represent a new mechanism for mediating electron transfer in metalloenzymes in the absence of exogenous cofactors.

About this StructureAbout this Structure

1GOH is a Single protein structure of sequence from Hypomyces rosellus. Full crystallographic information is available from OCA.

ReferenceReference

Novel thioether bond revealed by a 1.7 A crystal structure of galactose oxidase., Ito N, Phillips SE, Stevens C, Ogel ZB, McPherson MJ, Keen JN, Yadav KD, Knowles PF, Nature. 1991 Mar 7;350(6313):87-90. PMID:2002850 Page seeded by OCA on Fri May 2 17:49:28 2008

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OCA

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 [[Image:1goh.gif|left|200px]]
- {{Structure
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-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Galactose_oxidase Galactose oxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.3.9 1.1.3.9] </span>
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-}}
 '''NOVEL THIOETHER BOND REVEALED BY A 1.7 ANGSTROMS CRYSTAL STRUCTURE OF GALACTOSE OXIDASE'''
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 [[Category: Knowles, P F.]]
 [[Category: Phillips, S E.V.]]
-[[Category: oxidoreductase(oxygen(a))]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 17:49:28 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:48:10 2008''