The crystallization of a mutant precursor penicillin acylase [penicillin am
idohydrolase (amidase) E.C 3.5.1.11] from Escherichia coli W (ATCC 11105) u
sing the hanging-drop method is reported. The crystals are in space group P
1 with unit-cell parameters a = 51.04, b = 63.58, c = 71.17 Angstrom, alpha
= 103.0, beta = 110.6, gamma = 105.3 degrees, with one molecule in the asy
mmetric unit, and diffract to 1.8 Angstrom using synchrotron radiation.