>TIGR01321 TrpR trp operon repressor; InterPro: IPR013335 The Trp repressor (TrpR) binds to at least five operators in the Escherichia coli genome, repressing gene expression. The operators at which it binds vary considerably in DNA sequence and location within the promoter; when bound to the Trp operon it recognises the sequence 5'-ACTAGT-3' and acts to prevent the initiation of transcription. The TrpR controls the trpEDCBA (trpO) operon and the genes for trpR, aroH, mtr and aroL, which are involved in the biosynthesis and uptake of the amino acid tryptophan . The repressor binds to the operators only in the presence of L-tryptophan, thereby controlling the intracellular level of its effector; the complex also regulates Trp repressor biosynthesis by binding to its own regulatory region. TrpR acts as a dimer that is composed of identical 6-helical subunits, where four of the helices form the core of the protein and intertwine with the corresponding helices from the other subunit. This entry represents Trp repressors found in proteobacterial and chlamydial species.; GO: 0016564 transcription repressor activity, 0006355 regulation of transcription DNA-dependent.

Probab=94.43  E-value=0.061  Score=32.34  Aligned_cols=38  Identities=24%  Similarity=0.307  Sum_probs=32.5

Q ss_pred             HHHHHHHHHHHHHH--HHCCCCHHHHHHHHHHHHHHHHHH
Q ss_conf             99999999999999--983994999999863429999887
Q gi|254781147|r   17 RERMIFVNNFRNIR--KEAKLTQKEIRNRTGFAQSWISEL   54 (83)
Q Consensus        17 ~~~~~~g~~ir~~R--~~~gltq~ela~~~gis~~~is~i   54 (83)
T Consensus        37 ~Er~dl~~R~~I~~~LL~~~~~QREi~~~lG~SiA~ITRG   76 (95)
T TIGR01321        37 DEREDLGSRVRIVEELLEGEMSQREIAEKLGVSIATITRG   76 (95)
T ss_pred             HHHHHHHHHHHHHHHHHCCCCCHHHHHHHHCCCHHHHHHH
T ss_conf             3799998799999999614897478888637616678787