1wx2

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{{STRUCTURE_1wx2| PDB=1wx2 | SCENE= }}
{{STRUCTURE_1wx2| PDB=1wx2 | SCENE= }}
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'''Crystal Structure of the oxy-form of the copper-bound Streptomyces castaneoglobisporus tyrosinase complexed with a caddie protein prepared by the addition of hydrogenperoxide'''
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===Crystal Structure of the oxy-form of the copper-bound Streptomyces castaneoglobisporus tyrosinase complexed with a caddie protein prepared by the addition of hydrogenperoxide===
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==Overview==
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At high resolution, we determined the crystal structures of copper-bound and metal-free tyrosinase in a complex with ORF378 designated as a "caddie" protein because it assists with transportation of two CuII ions into the tyrosinase catalytic center. These structures suggest that the caddie protein covers the hydrophobic molecular surface of tyrosinase and interferes with the binding of a substrate tyrosine to the catalytic site of tyrosinase. The caddie protein, which consists of one six-strandedbeta-sheet and one alpha-helix, has no similarity with all proteins deposited into the Protein Data Bank. Although tyrosinase and catechol oxidase are classified into the type 3 copper protein family, the latter enzyme lacks monooxygenase activity. The difference in catalytic activity is based on the structural observations that a large vacant space is present just above the active center of tyrosinase and that one of the six His ligands for the two copper ions is highly flexible. These structural characteristics of tyrosinase suggest that, in the reaction that catalyzes the ortho-hydroxylation of monophenol, one of the two Cu(II) ions is coordinated by the peroxide-originated oxygen bound to the substrate. Our crystallographic study shows evidence that the tyrosinase active center formed by dinuclear coppers is flexible during catalysis.
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(as it appears on PubMed at http://www.pubmed.gov), where 16436386 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16436386}}
==About this Structure==
==About this Structure==
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[[Category: Type-3 copper]]
[[Category: Type-3 copper]]
[[Category: Tyrosinase]]
[[Category: Tyrosinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 14:15:09 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:39:32 2008''

Revision as of 01:39, 29 July 2008

Image:1wx2.png

Template:STRUCTURE 1wx2

Crystal Structure of the oxy-form of the copper-bound Streptomyces castaneoglobisporus tyrosinase complexed with a caddie protein prepared by the addition of hydrogenperoxide

Template:ABSTRACT PUBMED 16436386

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystallographic evidence that the dinuclear copper center of tyrosinase is flexible during catalysis., Matoba Y, Kumagai T, Yamamoto A, Yoshitsu H, Sugiyama M, J Biol Chem. 2006 Mar 31;281(13):8981-90. Epub 2006 Jan 25. PMID:16436386

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