Nature of the promoter activated by C.PvuII, an unusual regulatory protein conserved among restriction-modification systems.

ABSTRACT: A widely distributed family of small regulators, called C proteins, controls a subset of restriction-modification systems. The C proteins studied to date activate transcription of their own genes and that of downstream endonuclease genes; this arrangement appears to delay endonuclease expression relative to that of the protective methyltransferase when the genes enter a new cell. C proteins bind to conserved sequences called C boxes. In the PvuII system, the C boxes have been reported to extend from -23 to +3 relative to the transcription start for the gene for the C protein, an unexpected starting position relative to a bound activator. This study suggests that transcript initiation within the C boxes represents initial, C-independent transcription of pvuIICR. The major C protein-dependen

SUBMITTER: Knowle D 

PROVIDER: S-EPMC543531 | biostudies-literature | 2005 Jan

REPOSITORIES: biostudies-literature