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J. Bacteriol., 11 1995, 6313-6315, Vol 177, No. 21
Copyright © 1995, American Society for Microbiology

The regulatory C proteins from different restriction-modification systems can cross-complement

CL Ives, A Sohail and JE Brooks
New England Biolabs, Beverly, Massachusetts 01915, USA.

The BamHI restriction-modification system contains a third gene, bamHIC, which positively regulates bamHIR. Similar small genes from other systems were tested in vivo for their ability to cross- complement. C.BamHI protein was identified, purified, and used to raise polyclonal antibodies. Attempts to detect other C proteins in cell extracts by cross-reactivity with C.BamHI antibodies proved unsuccessful.

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