1e8g

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{{STRUCTURE_1e8g| PDB=1e8g | SCENE= }}
{{STRUCTURE_1e8g| PDB=1e8g | SCENE= }}
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'''STRUCTURE OF THE H61T DOUBLE MUTANT OF VANILLYL-ALCOHOL OXIDASE IN COMPLEX WITH FLUORO-CRESOL'''
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===STRUCTURE OF THE H61T DOUBLE MUTANT OF VANILLYL-ALCOHOL OXIDASE IN COMPLEX WITH FLUORO-CRESOL===
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==Overview==
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Vanillyl-alcohol oxidase (VAO) is member of a newly recognized flavoprotein family of structurally related oxidoreductases. The enzyme contains a covalently linked FAD cofactor. To study the mechanism of flavinylation we have created a design point mutation (His-61 --&gt; Thr). In the mutant enzyme the covalent His-C8alpha-flavin linkage is not formed, while the enzyme is still able to bind FAD and perform catalysis. The H61T mutant displays a similar affinity for FAD and ADP (K(d) = 1.8 and 2.1 microm, respectively) but does not interact with FMN. H61T is about 10-fold less active with 4-(methoxymethyl)phenol) (k(cat) = 0.24 s(-)(1), K(m) = 40 microm) than the wild-type enzyme. The crystal structures of both the holo and apo form of H61T are highly similar to the structure of wild-type VAO, indicating that binding of FAD to the apoprotein does not require major structural rearrangements. These results show that covalent flavinylation is an autocatalytical process in which His-61 plays a crucial role by activating His-422. Furthermore, our studies clearly demonstrate that in VAO, the FAD binds via a typical lock-and-key approach to a preorganized binding site.
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==About this Structure==
==About this Structure==
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[[Category: Flavoenzyme]]
[[Category: Flavoenzyme]]
[[Category: Specificity]]
[[Category: Specificity]]
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Revision as of 21:19, 30 June 2008

Image:1e8g.png

Template:STRUCTURE 1e8g

STRUCTURE OF THE H61T DOUBLE MUTANT OF VANILLYL-ALCOHOL OXIDASE IN COMPLEX WITH FLUORO-CRESOL

Template:ABSTRACT PUBMED 10984479

About this Structure

1E8G is a Single protein structure of sequence from Penicillium simplicissimum. Full crystallographic information is available from OCA.

Reference

Structural analysis of flavinylation in vanillyl-alcohol oxidase., Fraaije MW, van Den Heuvel RH, van Berkel WJ, Mattevi A, J Biol Chem. 2000 Dec 8;275(49):38654-8. PMID:10984479

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