Abstract
Crystals of the aspartate aminotransferase from Escherichia coli (aspC gene product) have been examined by X-ray analysis. The crystals grow as elongated rectangular prisms, with the symmetry of space group C222 1. Unit cell dimensions are a = 156A, b = 87.6A, c = 80.6A and α = β = γ = 90 °. There is one protein subunit of molecular weight 43,600 per asymmetric unit.