>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=99.56  E-value=1.1e-14  Score=123.73  Aligned_cols=57  Identities=44%  Similarity=0.539  Sum_probs=55.9

Q ss_pred             CCHHHHHHHHHHHCCCCHHHHHHHHCCCHHHHHHHHHHHHHHCCCCCHHHHHHHHHH
Q ss_conf             998999999999879997899999499988999999999998079978999999997
Q gi|254780693|r  174 LTERETSCLQLAGDGYTSEEIAEKLGLSVHTVNAYLGSATVKLDAVNRIQAIAKAIR  230 (235)
Q Consensus       174 LT~RE~evL~l~a~G~t~~eIA~~L~iS~~TV~~hl~~i~~KLg~~nR~qava~A~~  230 (235)
T Consensus         1 LT~rE~~il~~~~~G~s~~eIA~~L~is~~TV~~~~~~i~~Kl~~~~r~elv~~A~r   57 (57)
T cd06170           1 LTPREREVLRLLAEGKTNKEIADILGISEKTVKTHLRNIMRKLGVKSRTQLVAYAIR   57 (57)
T ss_pred             CCHHHHHHHHHHHCCCCHHHHHHHHCCCHHHHHHHHHHHHHHHCCCCHHHHHHHHHC
T ss_conf             988999999999807999999999897899999999999998689999999998729