home *** CD-ROM | disk | FTP | other *** search
- ********************************************************
- * Bacterial regulatory proteins, merR family signature *
- ********************************************************
-
- The many bacterial transcription regulation proteins which bind DNA through a
- 'helix-turn-helix' motif can be classified into subfamilies on the basis of
- sequence similarities. One of these subfamilies groups together:
-
- - Mercuric resistance operon regulatory protein merR [1,2]. MerR, which is
- found in many bacterial species mediates the mercuric-dependent induction
- of the mercury resistance operon. In the absence of mercury merR represses
- transcription by binding tightly, as a dimer, to the 'mer' operator region;
- when mercury is present the dimeric complex binds a single ion and becomes
- a potent transcriptional activator, while remaining bound to the mer site.
- - nolA, a nodulation protein from Bradyrhizobium japonicum [3]. Nola is
- involved in the genotype-specific nodulation of soybeans.
- - soxR, a protein that, with the soxS protein, controls a superoxide response
- regulon in Escherichia coli.
- - tipA from Streptomyces lividans [4]; tipA is a transcriptional activator
- which binds to and is activated by the antibiotic thiostrepton.
- - Escherichia coli hypothetical protein yehV.
- - Escherichia coli hypothetical protein yhdM [5].
-
- The 'helix-turn-helix' DNA-binding motif of these proteins is located in the
- N-terminal part of the sequences. The pattern we use to detect these proteins
- starts at position 2 of the helix-turn-helix motif and extend three residues
- upstream of its C-terminal extremity.
-
- -Consensus pattern: [GS]-x-[LIVMF]-A-x(2)-[STAC]-[GDE]-[IV]-[STAN]-x(2)-[STA]-
- [LIVM]-[RH]-x-[YW]-[DEQ]-x(2,3)-[GHQ]-[LIVM](2)
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Helmann J.D., Ballard B.T., Walsh C.T.
- Science 247:946-948(1990).
- [ 2] Helmann J.D., Wang Y., Mahler I., Walsh C.T.
- J. Bacteriol. 171:222-229(1989).
- [ 3] Sadowsky M.J., Cregan P.B., Gottfert M., Sharma A., Gerhold D.,
- Rodriguez-Quinones F., Keyser H.H., Hennecke H., Stacey G.
- Proc. Natl. Acad. Sci. U.S.A. 88:637-641(1991).
- [ 4] Holmes D.J., Caso J.L., Thompson C.J.
- EMBO J. 12:3183-3191(1993).
- [ 5] Christie G.E., White T.J., Goodwin T.S.
- Gene In press(1994).
-