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- * Lambdoid phages regulatory protein CIII signature *
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-
- The lambdoid phage regulatory protein CIII [1] is a very small protein
- whose presence in the cell results in the stabilization of the CII
- transcriptional activator, a usually very unstable protein. The stabilized CII
- protein is then able to activate CI, the gene for the repressor protein which
- prevents the transcription of proteins necessary for lytic development and
- thus promotes the establishment of lysogeny.
-
- The exact mechanism of the action of CIII on the stability of CII is not yet
- known, although it has been proposed that CIII acts as an inhibitor of a
- protease that degrades CII.
-
- It has been shown that a region of 22 residues, located in the central part of
- various lambdoid phage CIII's, is the region of highest sequence similarity
- and sufficient for the activity of the protein. We have derived a pattern
- from this region.
-
- -Consensus pattern: E-S-x-L-x-R-x(2)-[KR]-x-L-x(4)-[KR](2)-x(2)-[DE]-x-L
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: December 1991 / First entry.
-
- [ 1] Kornitzer D., Altuvia S., Oppenheim A.B.
- Proc. Natl. Acad. Sci. U.S.A. 88:5217-5221(1991).
-