The B2 subunit of ribonucleotide reductase from Escherichia coli has been crystallized from ammonium sulfate solutions at pH 6.0. Crystals grew as orthorhombic plates with cell dimensions a = 58 A, b = 73 A, and c = 205 A. The asymmetric unit probably contains one B2 dimer of molecular weight 2 X 43,000. The packing of molecules in the crystals is compatible with an elongated shape of the dimer. The crystals diffract to 2.5 A and are suitable for structural work.
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Joelson et al. (1984) studied this question.
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