Single crystals of an amino-terminal fragment of Escherichia coli alanine tRNA synthetase have been prepared by the vapor diffusion method. The fragment extends to amino acid residue 368 and catalyzes the synthesis of alanyl adenylate. The crystals grow in the presence of alanine as rhombic plates in space group P212121 and with unit cell dimensions of a = 67.9 A ̊, b = 98.5 A ̊ and c = 123.6 A ̊ (1 Å = 0.1 nm). They diffract to better than 3 Å resolution.
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