1oao
From Proteopedia
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==Overview== | ==Overview== | ||
| - | The crystal structure of the tetrameric alpha2beta2 acetyl-coenzyme A, synthase/carbon monoxide dehydrogenase from Moorella thermoacetica has, been solved at 1.9 A resolution. Surprisingly, the two alpha subunits, display different (open and closed) conformations. Furthermore, X-ray data, collected from crystals near the absorption edges of several metal ions, indicate that the closed form contains one Zn and one Ni at its active, site metal cluster (A-cluster) in the alpha subunit, whereas the open form, has two Ni ions at the corresponding positions. Alternative metal contents, at the active site have been observed in a recent structure of the same, protein in which A-clusters contained one Cu and one Ni, and in, reconstitution studies of a recombinant apo form of a related acetyl-CoA, .. | + | The crystal structure of the tetrameric alpha2beta2 acetyl-coenzyme A, synthase/carbon monoxide dehydrogenase from Moorella thermoacetica has, been solved at 1.9 A resolution. Surprisingly, the two alpha subunits, display different (open and closed) conformations. Furthermore, X-ray data, collected from crystals near the absorption edges of several metal ions, indicate that the closed form contains one Zn and one Ni at its active, site metal cluster (A-cluster) in the alpha subunit, whereas the open form, has two Ni ions at the corresponding positions. Alternative metal contents, at the active site have been observed in a recent structure of the same, protein in which A-clusters contained one Cu and one Ni, and in, reconstitution studies of a recombinant apo form of a related acetyl-CoA, synthase. On the basis of our observations along with previously reported, data, we postulate that only the A-clusters containing two Ni ions are, catalytically active. |
==About this Structure== | ==About this Structure== | ||
| - | 1OAO is a | + | 1OAO is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Moorella_thermoacetica Moorella thermoacetica] with SO4, FE2, BCT, ZN, NI, ACT, SF4, XCC, SX, FLH and GOL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Carbon-monoxide_dehydrogenase_(acceptor) Carbon-monoxide dehydrogenase (acceptor)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.99.2 1.2.99.2] Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1OAO OCA]. |
==Reference== | ==Reference== | ||
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[[Category: wood/ljungdahl pathway]] | [[Category: wood/ljungdahl pathway]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 14:19:25 2007'' |
Revision as of 12:14, 5 November 2007
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NIZN[FE4S4] AND NINI[FE4S4] CLUSTERS IN CLOSED AND OPEN ALPHA SUBUNITS OF ACETYL-COA SYNTHASE/CARBON MONOXIDE DEHYDROGENASE
Overview
The crystal structure of the tetrameric alpha2beta2 acetyl-coenzyme A, synthase/carbon monoxide dehydrogenase from Moorella thermoacetica has, been solved at 1.9 A resolution. Surprisingly, the two alpha subunits, display different (open and closed) conformations. Furthermore, X-ray data, collected from crystals near the absorption edges of several metal ions, indicate that the closed form contains one Zn and one Ni at its active, site metal cluster (A-cluster) in the alpha subunit, whereas the open form, has two Ni ions at the corresponding positions. Alternative metal contents, at the active site have been observed in a recent structure of the same, protein in which A-clusters contained one Cu and one Ni, and in, reconstitution studies of a recombinant apo form of a related acetyl-CoA, synthase. On the basis of our observations along with previously reported, data, we postulate that only the A-clusters containing two Ni ions are, catalytically active.
About this Structure
1OAO is a Protein complex structure of sequences from Moorella thermoacetica with SO4, FE2, BCT, ZN, NI, ACT, SF4, XCC, SX, FLH and GOL as ligands. Active as Carbon-monoxide dehydrogenase (acceptor), with EC number 1.2.99.2 Structure known Active Site: AC1. Full crystallographic information is available from OCA.
Reference
Ni-Zn-[Fe4-S4] and Ni-Ni-[Fe4-S4] clusters in closed and open subunits of acetyl-CoA synthase/carbon monoxide dehydrogenase., Darnault C, Volbeda A, Kim EJ, Legrand P, Vernede X, Lindahl PA, Fontecilla-Camps JC, Nat Struct Biol. 2003 Apr;10(4):271-9. PMID:12627225
Page seeded by OCA on Mon Nov 5 14:19:25 2007
Categories: Carbon-monoxide dehydrogenase (acceptor) | Moorella thermoacetica | Protein complex | Darnault, C. | Fontecilla-Camps, J.C. | Kim, E.J. | Legrand, P. | Lindahl, P.A. | Vernede, X. | Volbeda, A. | ACT | BCT | FE2 | FLH | GOL | NI | SF4 | SO4 | SX | XCC | ZN | Acetyl-coa formation | Electron transfer | Nickel | Oxidoreductase | Wood/ljungdahl pathway
