Ni-Zn-[Fe4-S4] and Ni-Ni-[Fe4-S4] clusters in closed and open subunits of acetyl-CoA synthase/carbon monoxide dehydrogenase - PubMed (original) (raw)
Ni-Zn-[Fe4-S4] and Ni-Ni-[Fe4-S4] clusters in closed and open subunits of acetyl-CoA synthase/carbon monoxide dehydrogenase
Claudine Darnault et al. Nat Struct Biol. 2003 Apr.
Abstract
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.
Comment in
- Ni and CO: more surprises.
Hausinger RP. Hausinger RP. Nat Struct Biol. 2003 Apr;10(4):234-6. doi: 10.1038/nsb0403-234. Nat Struct Biol. 2003. PMID: 12660715 No abstract available.
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