>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=93.39  E-value=0.47  Score=27.21  Aligned_cols=21  Identities=19%  Similarity=0.396  Sum_probs=11.1

Q ss_pred             HHHHHHHHHHHHC-CCCCCCCC
Q ss_conf             7999999998531-65454387
Q gi|254780847|r   83 SGDLTHHLLVEES-HNIFFIGP  103 (282)
Q Consensus        83 s~~~~~~~l~~~~-~~v~viG~  103 (282)
T Consensus        96 ~~~~a~~~L~~~Ghr~I~~ig~  117 (265)
T cd01543          96 IGRMAAEHFLERGFRHFAFYGL  117 (265)
T ss_pred             HHHHHHHHHHHCCCCEEEEECC
T ss_conf             9999999999869974999899