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2h9a

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[[Image:2h9a.gif|left|200px]]
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{{STRUCTURE_2h9a| PDB=2h9a | SCENE= }}
{{STRUCTURE_2h9a| PDB=2h9a | SCENE= }}
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'''Corrinoid Iron-Sulfur Protein'''
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===Corrinoid Iron-Sulfur Protein===
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==Overview==
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The cobalt- and iron-containing corrinoid iron-sulfur protein (CoFeSP) is functional in the acetyl-CoA (Ljungdahl-Wood) pathway of autotrophic carbon fixation in various bacteria and archaea, where it is essential for the biosynthesis of acetyl-CoA. CoFeSP acts in two methylation reactions: the transfer of a methyl group from methyltransferase (MeTr)-bound methyltetrahydrofolate to the cob(I)amide of CoFeSP and the transfer of the methyl group of methyl-cob(III)amide to the reduced Ni-Ni-[4Fe-4S] active site cluster A of acetyl-CoA synthase (ACS). We have solved the crystal structure of as-isolated CoFeSP(Ch) from the CO-oxidizing hydrogenogenic bacterium Carboxydothermus hydrogenoformans at 1.9-A resolution. The heterodimeric protein consists of two tightly interacting subunits with pseudo-twofold symmetry. The large CfsA subunit comprises three domains, of which the N-terminal domain binds the [4Fe-4S] cluster, the middle domain is a (betaalpha)(8)-barrel, and the C-terminal domain shows an open fold and binds Cobeta-aqua-(5,6-dimethylbenzimidazolylcobamide) in a "base-off" state without a protein ligand at the cobalt ion. The small CfsB subunit also displays a (betaalpha)(8)-barrel fold and interacts with the upper side of the corrin macrocycle. Structure-based alignments show that both (betaalpha)(8)-barrel domains are related to the MeTr in the acetyl-CoA pathway and to the folate domain of methionine synthase. We suggest that the C-terminal domain of the large subunit is the mobile element that allows the necessary interaction of CoFeSP(Ch) with the active site of ACS(Ch) and the methyltetrahydrofolate carrying MeTr. The conformation in the crystal structure shields the two open coordinations of cobalt and likely represents a resting state.
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(as it appears on PubMed at http://www.pubmed.gov), where 16983091 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16983091}}
==About this Structure==
==About this Structure==
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[[Category: Beta-alpha-barrel]]
[[Category: Beta-alpha-barrel]]
[[Category: Heterodimer]]
[[Category: Heterodimer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 06:00:49 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 15:08:32 2008''

Revision as of 12:08, 29 July 2008

Image:2h9a.png

Template:STRUCTURE 2h9a

Corrinoid Iron-Sulfur Protein

Template:ABSTRACT PUBMED 16983091

About this Structure

2H9A is a Protein complex structure of sequences from Carboxydothermus hydrogenoformans. Full crystallographic information is available from OCA.

Reference

Structural insights into methyltransfer reactions of a corrinoid iron-sulfur protein involved in acetyl-CoA synthesis., Svetlitchnaia T, Svetlitchnyi V, Meyer O, Dobbek H, Proc Natl Acad Sci U S A. 2006 Sep 26;103(39):14331-6. Epub 2006 Sep 18. PMID:16983091

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