1ru3
From Proteopedia
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'''Crystal Structure of the monomeric acetyl-CoA synthase from Carboxydothermus hydrogenoformans''' | '''Crystal Structure of the monomeric acetyl-CoA synthase from Carboxydothermus hydrogenoformans''' | ||
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[[Category: Svetlitchnyi, V.]] | [[Category: Svetlitchnyi, V.]] | ||
[[Category: Thiele, B.]] | [[Category: Thiele, B.]] | ||
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| - | [[Category: | + | [[Category: Nickel]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:54:41 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 04:54, 3 May 2008
Crystal Structure of the monomeric acetyl-CoA synthase from Carboxydothermus hydrogenoformans
Overview
In anaerobic microorganisms employing the acetyl-CoA pathway, acetyl-CoA synthase (ACS) and CO dehydrogenase (CODH) form a complex (ACS/CODH) that catalyzes the synthesis of acetyl-CoA from CO, a methyl group, and CoA. Previously, a [4Fe-4S] cubane bridged to a copper-nickel binuclear site (active site cluster A of the ACS component) was identified in the ACS(Mt)/CODH(Mt) from Moorella thermoacetica whereas another study revealed a nickel-nickel site in the open form of ACS(Mt), and a zink-nickel site in the closed form. The ACS(Ch) of the hydrogenogenic bacterium Carboxydothermus hydrogenoformans was found to exist as an 82.2-kDa monomer as well as in a 1:1 molar complex with the 73.3-kDa CODHIII(Ch). Homogeneous ACS(Ch) and ACS(Ch)/CODHIII(Ch) catalyzed the exchange between [1-(14)C]acetyl-CoA and (12)CO with specific activities of 2.4 or 5.9 micromol of CO per min per mg, respectively, at 70 degrees C and pH 6.0. They also catalyzed the synthesis of acetyl-CoA from CO, methylcobalamin, corrinoid iron-sulfur protein, and CoA with specific activities of 0.14 or 0.91 micromol of acetyl-CoA formed per min per mg, respectively, at 70 degrees C and pH 7.3. The functional cluster A of ACS(Ch) contains a Ni-Ni-[4Fe-4S] site, in which the positions proximal and distal to the cubane are occupied by Ni ions. This result is apparent from a positive correlation of the Ni contents and negative correlations of the Cu or Zn contents with the acetyl-CoA/CO exchange activities of different preparations of monomeric ACS(Ch), a 2.2-A crystal structure of the dithionite-reduced monomer in an open conformation, and x-ray absorption spectroscopy.
About this Structure
1RU3 is a Single protein structure of sequence from Carboxydothermus hydrogenoformans. Full crystallographic information is available from OCA.
Reference
A functional Ni-Ni-[4Fe-4S] cluster in the monomeric acetyl-CoA synthase from Carboxydothermus hydrogenoformans., Svetlitchnyi V, Dobbek H, Meyer-Klaucke W, Meins T, Thiele B, Romer P, Huber R, Meyer O, Proc Natl Acad Sci U S A. 2004 Jan 13;101(2):446-51. Epub 2003 Dec 29. PMID:14699043 Page seeded by OCA on Sat May 3 07:54:41 2008
