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- *********************************************************
- * Transcriptional antiterminators bglG family signature *
- *********************************************************
-
- Escherichia coli bglG protein mediates the positive regulation of the beta-
- glucoside (bgl) operon by functioning as a transcriptional antiterminator.
- bglG is a RNA-binding protein that recognizes a specific sequence located just
- upstream of two termination sites within the operon. The activity of bglG is
- supressed by its phosphorylation [2] by bglF (EII-bgl), the permease from the
- beta-glucoside PTS system.
-
- BglG is highly similar to the following proteins, which also probably act as
- transcriptional antiterminators:
-
- - arbG from Erwinia chrysanthemi [3], also involved in the regulation of a
- beta-glucoside operon. ArbG is probably phosphorylated by arbF (EII-bgl).
- - sacT from Bacillus subtilis, which regulates the expression of the sucrose
- operon (sacPA). SacT is probably phosphorylated by sacP (EII-scr).
- - sacY from Bacillus subtilis, which regulates the expression of the
- levansucrase operon (sacBX). SacY is probably phosphorylated by the sacX
- protein.
- - levR from Bacillus subtilis, which regulates the expression of the levanase
- operon (levDEFG and sacC). LevR is composed of two domains: a N-terminal
- section that contains a sigma-54 factor interaction ATP-binding domain and
- a C-terminal bglG-like domain. LevR could be phosphorylated by levD or
- levE.
-
- As a signature pattern for these proteins, we selected a conserved region that
- includes a conserved histidine that could be the site of phosphorylation.
-
- -Consensus pattern: [ST]-x-H-x(2)-[FA](2)-[LIVM]-x-R-x(2)-[QN]
- [H could be phosphorylated]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: Escherichia coli feoB.
- -Last update: June 1994 / Text revised.
-
- [ 1] Houman F., Diaz-Torre M.R., Wright A.
- Cell 62:1153-1163(1990).
- [ 2] Amster-Choder O., Wright A.
- Science 249:540-542(1990).
- [ 3] El Hassouni M., Henrissat B., Chippaux M., Barras F.
- J. Bacteriol. 174:765-777(1992).
-