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KMID : 0880220160540060440
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Journal of Microbiology
2016 Volume.54 No. 6 p.440 ~ p.444
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Purification, crystallization, and preliminary X-ray crystallographic analysis of the Group III chaperonin from Carboxydothermus hydrogenoformans
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An Young-Jun
Rowland Sara E.
Robb Frank T.
Cha Sun-Shin
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Abstract
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Chaperonins (CPNs) are megadalton sized ATP-dependent nanomachines that facilitate protein folding through complex cycles of complex allosteric articulation. They consist of two back-to-back stacked multisubunit rings. CPNs are usually classified into Group I and Group II. Here, we report the crystallization of both the AMPPNP (an ATP analogue) and ADP bound forms of a novel CPN, classified as belonging to a third Group, recently discovered in the extreme thermophile Carboxydothermus hydrogenoformans. Crystals of the two forms were grown by the vapor batch crystallization method at 295 K. Crystals of the Ch-CPN/AMPPNP complex diffracted to 3.0 A resolution and belonged to the space group P422, with unit-cell parameters a = b = 186.166, c = 160.742 A. Assuming the presence of four molecules in the asymmetric unit, the solvent content was estimated to be about 60.02%. Crystals of the Ch-CPN/ADP complex diffracted to 4.0 A resolution and belonged to the space group P4212, with unit-cell parameters a = b = 209.780, c = 169.813A. Assuming the presence of four molecules in the asymmetric unit, the solvent content was estimated to be about 70.19%.
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KEYWORD
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Group III chaperonins, protein folding, AT-Pfueled nanomachine, crystallization
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