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Purification, crystallization and preliminary X-ray studies of two isoforms of Rubisco from Alcaligenes eutrophus.

Two different isoforms of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) from Alcaligenes eutrophus have been purified and crystallized. Both isoforms crystallize in space group P43212. Crystals of isoform I (unit-cell dimensions a = 112.0 and c = 402.7 A) diffract to 2.7 A, whereas isoform II (unit-cell dimensions a = 111.8 and c = 400.0 A) presently diffract to 3.2 A, using synchrotron radiation in both cases.