2b98

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{{STRUCTURE_2b98| PDB=2b98 | SCENE= }}
{{STRUCTURE_2b98| PDB=2b98 | SCENE= }}
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'''Crystal Structure of an archaeal pentameric riboflavin synthase'''
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===Crystal Structure of an archaeal pentameric riboflavin synthase===
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==Overview==
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Whereas eubacterial and eukaryotic riboflavin synthases form homotrimers, archaeal riboflavin synthases from Methanocaldococcus jannaschii and Methanothermobacter thermoautrophicus are homopentamers with sequence similarity to the 6,7-dimethyl-8-ribityllumazine synthase catalyzing the penultimate step in riboflavin biosynthesis. Recently it could be shown that the complex dismutation reaction catalyzed by the pentameric M. jannaschii riboflavin synthase generates riboflavin with the same regiochemistry as observed for trimeric riboflavin synthases. Here we present crystal structures of the pentameric riboflavin synthase from M. jannaschii and its complex with the substrate analog inhibitor, 6,7-dioxo-8-ribityllumazine. The complex structure shows five active sites located between adjacent monomers of the pentamer. Each active site can accommodate two substrate analog molecules in anti-parallel orientation. The topology of the two bound ligands at the active site is well in line with the known stereochemistry of a pentacyclic adduct of 6,7-dimethyl-8-ribityllumazine that has been shown to serve as a kinetically competent intermediate. The pentacyclic intermediates of trimeric and pentameric riboflavin synthases are diastereomers.
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{{ABSTRACT_PUBMED_16272154}}
==About this Structure==
==About this Structure==
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[[Category: Schott, A K.]]
[[Category: Schott, A K.]]
[[Category: Lumazine riboflavin]]
[[Category: Lumazine riboflavin]]
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Revision as of 16:16, 27 July 2008

Image:2b98.png

Template:STRUCTURE 2b98

Crystal Structure of an archaeal pentameric riboflavin synthase

Template:ABSTRACT PUBMED 16272154

About this Structure

2B98 is a Single protein structure of sequence from Methanocaldococcus jannaschii. Full crystallographic information is available from OCA.

Reference

Crystal structure of an archaeal pentameric riboflavin synthase in complex with a substrate analog inhibitor: stereochemical implications., Ramsperger A, Augustin M, Schott AK, Gerhardt S, Krojer T, Eisenreich W, Illarionov B, Cushman M, Bacher A, Huber R, Fischer M, J Biol Chem. 2006 Jan 13;281(2):1224-32. Epub 2005 Nov 4. PMID:16272154

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