Crystallization and preliminary X-ray analysis of theEscherichia coli replication terminator protein complexed with DNA

Crystals of the Escherichia coli replication terminator protein (Tus) complexed with its binding site DNA were obtained by a microdialysis method using PEG 4000. They belong to the tetragonal space group P4(1)2(1)2 or P4(3)2(1)2 with the unit cell parameter: a = 68.1 A, c = 230.7 A and contain one protein-DNA complex in an asymmetric unit. The native data set has been collected to 2.7 A resolution.