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Nucleic Acids Research, 1992, Vol. 20, No. 12 3085-3090
© 1992

MOLECULAR BIOLOGY

The c4 repressor of bacteriophage P1 is a processed 77 base antisense RNA

Martin Citron and Heinz Schuster*

Max-Planck Institut für Molekulare Genetik Ihnestrasse 73, D-1000 Berlin 33, Germany

* To whom correspondence should be addressed

Received March 6, 1992. Revised May 18, 1992. Accepted May 18, 1992.

The c4 repressors of the temperate bacteriophages P1 and P7 inhibit antirepressor synthesis and are essential for establishment and maintenance of lysogeny. Using in vivo complementation tests we have previously shown that c4 is an antisense RNA acting on a target, ant mRNA, which is transcribed from the same promoter. Here we identify the c4 repressor molecule of P1 as a 77±1 base RNA by mapping its termini and show that the c4 RNA in P7 lysogens has the same or a similar size. P1 c4 RNA is encoded in a region shown to be sufficient for c4 complementation. It covers exactly the 74 bases previously suggested to fold into a stem-loop secondary structure essential for c4 function. Furthermore, we demonstrate that the 5' end of c4 RNA is generated by processing. Thus, c4 is the first example of an antisense RNA to be processed. A possible mechanism of processing is discussed.


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