1kyx

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{{STRUCTURE_1kyx| PDB=1kyx | SCENE= }}
{{STRUCTURE_1kyx| PDB=1kyx | SCENE= }}
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'''Lumazine Synthase from S.pombe bound to carboxyethyllumazine'''
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===Lumazine Synthase from S.pombe bound to carboxyethyllumazine===
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==Overview==
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Riboflavin is an essential cofactor in all organisms. Its direct biosynthetic precursor, 6,7-dimethyl-8-ribityllumazine, is synthesised by the enzyme 6,7-dimethyl-8-ribityllumazine synthase. Recently, we have found that the enzyme from Schizosaccharomyces pombe binds riboflavin, the final product of the pathway with a relatively high affinity with a KD of 1.2 microM. Here, we report on the crystal structure of lumazine synthase from S. pombe with bound riboflavin and compare the binding mode with those of the substrate analogue inhibitor 5-nitro-6-(D-ribitylamino)-2,4(1H,3H)-pyrimidinedione and of the product analogue 6-carboxyethyl-7-oxo-8-ribityllumazine. In all complexes the pyrimidinedione moieties of each respective ligand bind in a very similar orientation. Binding of riboflavin additionally involves a stacking interaction of the dimethylbenzene moiety with the side-chain of His94, a highly conserved residue in all lumazine synthases. The enzyme from Bacillus subtilis showed a KD of at least 1 mM whereas the very homologous enzyme from Saccharomyces cerevisiae had a comparable KD of 3.9 microM. Structural comparison of the S. cerevisiae, the S. pombe, and the mutant enzymes suggests that fine tuning of affinity is achieved by influencing this stacking interaction.
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{{ABSTRACT_PUBMED_12083520}}
==About this Structure==
==About this Structure==
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[[Category: Riboflavin biosynthesis]]
[[Category: Riboflavin biosynthesis]]
[[Category: Schizosaccharomyces pombe]]
[[Category: Schizosaccharomyces pombe]]
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Revision as of 08:19, 2 July 2008

Image:1kyx.png

Template:STRUCTURE 1kyx

Lumazine Synthase from S.pombe bound to carboxyethyllumazine

Template:ABSTRACT PUBMED 12083520

About this Structure

1KYX is a Single protein structure of sequence from Schizosaccharomyces pombe. Full crystallographic information is available from OCA.

Reference

The structural basis of riboflavin binding to Schizosaccharomyces pombe 6,7-dimethyl-8-ribityllumazine synthase., Gerhardt S, Haase I, Steinbacher S, Kaiser JT, Cushman M, Bacher A, Huber R, Fischer M, J Mol Biol. 2002 May 17;318(5):1317-29. PMID:12083520

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