2a57

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{{STRUCTURE_2a57| PDB=2a57 | SCENE= }}
{{STRUCTURE_2a57| PDB=2a57 | SCENE= }}
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'''Structure of 6,7-Dimthyl-8-ribityllumazine synthase from Schizosaccharomyces pombe mutant W27Y with bound ligand 6-carboxyethyl-7-oxo-8-ribityllumazine'''
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===Structure of 6,7-Dimthyl-8-ribityllumazine synthase from Schizosaccharomyces pombe mutant W27Y with bound ligand 6-carboxyethyl-7-oxo-8-ribityllumazine===
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==Overview==
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The amino acid residue tryptophan 27 of 6,7-dimethyl-8-ribityllumazine synthase of the yeast Schizosaccharomyces pombe was replaced by tyrosine. The structures of the W27Y mutant protein in complex with riboflavin, the substrate analogue 5-nitroso-6-ribitylamino-2,4(1H,3H)-pyrimidinedione, and the product analogue 6-carboxyethyl-7-oxo-8-ribityllumazine, were determined by X-ray crystallography at resolutions of 2.7-2.8 A. Whereas the indole system of W27 forms a coplanar pi-complex with riboflavin, the corresponding phenyl ring in the W27Y mutant establishes only peripheral contact with the heterocyclic ring system of the bound riboflavin. These findings provide an explanation for the absence of the long wavelength shift in optical absorption spectra of riboflavin bound to the mutant enzyme. The structures of the mutants are important tools for the interpretation of the unusual physical properties of riboflavin in complex with lumazine synthase.
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(as it appears on PubMed at http://www.pubmed.gov), where 15265040 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15265040}}
==About this Structure==
==About this Structure==
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[[Category: Riboflavin]]
[[Category: Riboflavin]]
[[Category: Riboflavin biosynthesis]]
[[Category: Riboflavin biosynthesis]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 15:10:57 2008''

Revision as of 12:11, 27 July 2008

Image:2a57.png

Template:STRUCTURE 2a57

Structure of 6,7-Dimthyl-8-ribityllumazine synthase from Schizosaccharomyces pombe mutant W27Y with bound ligand 6-carboxyethyl-7-oxo-8-ribityllumazine

Template:ABSTRACT PUBMED 15265040

About this Structure

2A57 is a Single protein structure of sequence from Schizosaccharomyces pombe. Full crystallographic information is available from OCA.

Reference

Structural basis of charge transfer complex formation by riboflavin bound to 6,7-dimethyl-8-ribityllumazine synthase., Koch M, Breithaupt C, GerhardtHaase S, Weber S, Cushman M, Huber R, Bacher A, Fischer M, Eur J Biochem. 2004 Aug;271(15):3208-14. PMID:15265040

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