>cd06170 LuxR_C_like C-terminal DNA-binding domain of LuxR-like proteins. This domain contains a helix-turn-helix motif and binds DNA. Proteins belonging to this group are response regulators; some act as transcriptional activators, others as transcriptional repressors. Many are active as homodimers. Many are two domain proteins in which the DNA binding property of the C-terminal DNA binding domain is modulated by modifications of the N-terminal domain. For example in the case of Lux R which participates in the regulation of gene expression in response to fluctuations in cell-population density (quorum-sensing), a signaling molecule, the pheromone Acyl HSL (N-acyl derivatives of homoserine lactone), binds to the N-terminal domain and leads to LuxR dimerization. For others phophorylation of the N-terminal domain leads to multimerization, for example Escherichia coli NarL and Sinorhizobium melilot FixJ. NarL controls gene expression of many respiratory-related operons when environmental

Probab=93.28  E-value=0.34  Score=26.29  Aligned_cols=45  Identities=16%  Similarity=0.293  Sum_probs=41.6

Q ss_pred             CHHHHHHHHHHHHHCCHHHHHHHHCCCHHHHHHHHHHHHHHHCCE
Q ss_conf             889999999999827689999882899789999999999995882
Q gi|254780282|r    4 DWDKLRVFYVVARSGSFTHAAEQLHLSQSSISRQISGLETEVGIK   48 (299)
Q Consensus         4 d~~~L~~f~~v~~~gs~s~AA~~L~itq~avS~~i~~LE~~lg~~   48 (299)
T Consensus         2 T~rE~~il~~~~~G~s~~eIA~~L~is~~TV~~~~~~i~~Kl~~~   46 (57)
T cd06170           2 TPREREVLRLLAEGKTNKEIADILGISEKTVKTHLRNIMRKLGVK   46 (57)
T ss_pred             CHHHHHHHHHHHCCCCHHHHHHHHCCCHHHHHHHHHHHHHHHCCC
T ss_conf             889999999998079999999998978999999999999986899