DNAJ is a prokaryotic heat shock induced protein from the bacterium E.coli, which is under control of the htpr regulatory protein (1). DNAJ interacts with the chaperone Hsp70-like DNAK protein to disassemble a
protein complex found at a phage lambda’s origin of replication (ORI). DNAJ is also involved in a variety of difference biological processes in a living cell, including protein folding and transport, cell survival at high temperatures, negative autoregulation of the heat shock response, and the replication of bacteriophage lambda and other plasmids (2, 3).