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- * Bacterial regulatory proteins, lacI 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 [1,2]:
-
- - ascG, the ascBF operon repressor.
- - ccpA, a transcriptional regulator involved in catabolic repression of
- alpha-amylase in Bacillus subtilis.
- - cytR, a repressor of genes such as deoCABD, udp, and cdd which encode
- catabolizing enzymes; and nupC, nupG, and tsx encoding transporting and
- pore-forming proteins.
- - ebgR, the repressor for the genes coding for beta galactosidase alpha and
- beta subunits.
- - fruR (or shl), the fructose repressor. FruR is implicated in the regulation
- of a large number of operons encoding enzymes which comprise central
- pathways of carbon metabolism.
- - galR, the galactose operon repressor.
- - galS, the mgl operon repressor and galactose ultrainduction factor.
- - lacI, the lactose operon repressor.
- - malI, a maltose regulon protein that represses the malXY genes.
- - nfxB, which may repress the expression of genes that are associated with
- cell permeability to drugs such as guinolones in Pseudomonas aeruginosa.
- - opnR, the opine utilization repressor in Agrobacterium rhizogenes.
- - purF, a repressor for genes encoding purine nucleotide synthesis enzymes.
- - rafR, the raffinose operon repressor.
- - rbsR, the ribose operon repressor.
- - rbtR, the ribitol operon repressor.
- - scrR, the repressor for the scr operon in enteric bacteria.
-
- Most of the proteins in this family recognize sugar-inducers. The 'helix-turn-
- helix' DNA-binding motif of these proteins is located in the N-terminal
- extremity of the sequences. The pattern we use to detect these proteins spans
- the complete motif except for the last residue.
-
- -Consensus pattern: [LIVM]-x-[DE]-[LIVM]-A-x(2)-[STAG]-x-V-[SP]-x(2)-[STAG]-
- [LIVMA]-x(2)-[FLIVMAN]-[LIVMC]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for rafR.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Reizer J.
- jreizer@ucsd.edu
-
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Vartak N.B., Reizer J., Reizer A., Gripp J.T., Groisman E.A., Wu L.-F.,
- Tomich J.M., Saier M.H. Jr.
- Res. Microbiol. 142:951-963(1991).
- [ 2] Weickert M.J., Adhya S.
- J. Biol. Chem. 267:15869-15874(1992).
-