>cd01543 PBP1_XylR Ligand-binding domain of DNA transcription repressor specific for xylose (XylR). Ligand-binding domain of DNA transcription repressor specific for xylose (XylR), a member of the LacI-GalR family of bacterial transcription regulators. The ligand-binding domain of XylR is structurally homologous to the periplasmic sugar-binding domain of ABC-type transporters and both domains contain the type I periplasmic binding protein-like fold. The LacI-GalR family repressors are composed of two functional domains: an N-terminal HTH (helix-turn-helix) domain, which is responsible for the DNA-binding specificity, and a C-terminal ligand-binding domain, which is homologous to the type I periplasmic binding proteins. As also observed in the periplasmic binding proteins, the C-terminal domain of the bacterial transcription repressor undergoes a conformational change upon ligand binding which in turn changes the DNA binding affinity of the repressor.

Probab=91.94 E-value=1.2 Score=25.13 Aligned_cols=122 Identities=14% Similarity=0.037 Sum_probs=77.0 Q ss_pred CEEEEEEECHHHHHHHHHHHHHHHHHHHCCCCEEEEE-----HHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEEEECCCC Q ss_conf 7179998031289999999999999998799555553-----00144226999999863311378535665412000665 Q gi|254780346|r 6 PHVLIIEARFYENLSAMLFEGCVNVLHSRAVQWSSIV-----TPGVLEIPAAVSMVMNAKTRSVTYDGIIVLGVVMRGKT 80 (149) Q Consensus 6 ~kI~IV~s~~~~~i~~~ll~ga~~~l~~~~~~~~~i~-----VPGa~EiP~a~~~~~~~~~~~~~~D~vIaLG~VIkGeT 80 (149) T Consensus 110 r~I~~i-g~~~~~~~~~R~~Gf~~al~~~g~~~~~~~~~~~~~~~~~~~--~~~~l~~~l~~~~~ptAi~~~-------- 178 (265) T cd01543 110 RHFAFY-GLPGARWSDEREEAFRQLVAEAGYECSFFYRGLSTDAQSWEE--EQEELAQWLQSLPKPVGIFAC-------- 178 (265) T ss_pred CEEEEE-CCCCCHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCHHH--HHHHHHHHHHCCCCCEEEEEC-------- T ss_conf 749998-999880699999999999997799976341245446753999--999999998359998399988-------- Q ss_pred CHHHHHHHHHHHHHHHHHHHCCCCCEEEEECCCCHHHHHHHHCC-------CCCCCHHHHHHHHHHHHH Q ss_conf 24678999999999999974399705654255889999995065-------657456999999999999 Q gi|254780346|r 81 AHCDVIAHAVTRGLVDLSINGSLPIGNGIVVVDSEQQAFDRVSP-------SHLDRGGCAARSALAMIE 142 (149) Q Consensus 81 ~H~e~I~~~v~~gl~~lsl~~~~PI~~gILt~~n~~QA~~R~~~-------~~~nkG~eaa~Aal~mi~ 142 (149) T Consensus 179 --nD~~A~g~l~~l~~~Gi--~VP~disViGfD~~~~~~~~~~P~LTtV~q~~~~mG~~Aa~lL~~~i~ 243 (265) T cd01543 179 --TDARARQLLEACRRAGI--AVPEEVAVLGVDNDELICELSRPPLSSVEQNAERIGYEAAKLLDRLMR 243 (265) T ss_pred --CHHHHHHHHHHHHHHHC--CCCCCEEEEEECCCHHHHHHCCCCCCEEEECHHHHHHHHHHHHHHHHC T ss_conf --36999999999998322--577755999982868889527999733962999999999999999967

HHsearch alignment for GI: 254780346 and conserved domain: cd01543