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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Crystallization of the activated ternary complex of ribulose-1,5-bisphosphate carboxylase-oxygenase isolated from Rhodospirillum rubrum and from an Escherichia coli clone.

Ribulose-1,5-bisphosphate carboxylase-oxygenase was purified from the photosynthetic bacterium Rhodospirillum rubrum as well as from an Escherichia coli clone overproducing the enzyme. Although the latter enzyme contains 25 additional amino acid residues at the N terminus, both preparations yielded isomorphous tetragonal, bipyramidal crystals of the ternary complex of the enzyme with CO2 and Mg2+. Crystallization is sensitive to variation in pH and to the addition of the transition state analog, 2-carboxyarabinitol-1,5-bisphosphate. The systematic absences in the X-ray diffraction photographs suggest a tetragonal space group P4(3)2(1)2 or the enantiomorph P4(1)2(1)2 with cell dimensions a = b = 83 A, c = 290 A. There is one molecule per asymmetric unit. The resolution on still photographs is 3 A. The crystals are comparable to some of those already published but differ from others.[1]


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