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- * Bacterial regulatory proteins, asnC 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:
-
- - asnC, a regulatory protein from Escherichia coli, which is an activator of
- asnA transcription and a repressor of the expression of gidA at a post-
- transcriptional level.
- - gylR, from Streptomyces [1], a possible activator protein for the gylABX
- glycerol operon.
- - lrp, the leucine-responsive regulatory protein from Escherichia coli [2].
- Lrp activates a number of operons in response to the presence of exogenous
- leucine.
-
- 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
- spans the complete helix-turn-helix motif and extend three residues downstream
- and six residues upstream of both extremities.
-
- -Consensus pattern: R-x-[GSA]-x(2)-[DE]-[LIVM]-[SA]-x(2)-[LIVMFY]-G-[LIVM]-
- [SA]-x(7)-[LIVM]-x(2)-[LIVM]-x(3)-G
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Last update: December 1991 / First entry.
-
- [ 1] Bolotin A., Biro S.
- Gene 87:151-152(1990).
- [ 2] Willins D.A., Ryan C., Platko J.V., Calvo J.M.
- J. Biol. Chem. 266:10768-10774(1991).
-