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We note the existence of a "partially cis-acting" regulatory protein of bacteriophage λ: the product of the phage Q gene. We suggest that there may be a complete spectrum from "all cis" to "all trans" for such regulatory proteins. This behavior might arise because a DNA-binding protein either acts at a nearby (cis) site soon after synthesis or becomes "lost" for its trans activity on another genome through nonspecific interactions with DNA. Our proposed explanation provides one evolutionary basis for the linkage of genes for regulatory proteins and the sites at which such proteins act; it also suggests a possible rationale for the "metabolic instability" of certain regulatory proteins.

ON THE NATURE OF CIS-ACTING REGULATORY PROTEINS AND GENETIC ORGANIZATION IN BACTERIOPHAGE: THE EXAMPLE OF GENE Q OF BACTERIOPHAGE Λ