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PDOC00477
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1995-07-26
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* Bacterial regulatory proteins, merR family signature *
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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).