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Crystallization and preliminary X-ray analysis of the 12S central subunit of transcarboxylase from Propionibacterium
Y F Wang1, D C Hyatt, R E Rivera
1Department of Molecular Cardiology and Center for Structural Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
Abstract:
The hexameric 12S central subunit of transcarboxylase has been crystallized in both free and substrate-bound forms. The apo crystals belong to the cubic space group P4(2)32, with unit-cell parameters a = b = c = 188.5 A, and diffract to 3.5 A resolution. Crystals of two substrate-bound complexes, 12S with methylmalonyl CoA and 12S with malonyl CoA, are isomorphous and belong to space group C2, with unit-cell parameters a = 115.5, b = 201.4, c = 146.9 A, beta = 102.7 degrees. These crystals diffract to 1.9 A resolution with synchrotron radiation. Two useful heavy-atom phasing derivatives of methylmalonyl CoA-bound crystals have been obtained by co-crystallization or crystal soaking.
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