HHsearch alignment for GI: 254781218 and conserved domain: TIGR01321

>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=94.46  E-value=0.071  Score=31.40  Aligned_cols=57  Identities=16%  Similarity=0.253  Sum_probs=42.5

Q ss_pred             HHHCCCHHHHHHHHHHHHHHHHHHHHC--CCCHHHHHHHHCCCHHHHHHHHCCCCCCCHHHH
Q ss_conf             100015668999999999999999985--998899999848999999988779988899999
Q gi|254781218|r   17 YTLIITPEIRQYWKDVGTRIKDIRKAN--NKTQKEMAIGANQLESAVNLFENGMCSTSIRYA   76 (205)
Q Consensus        17 ~~~~~~~~~~~~~~~iG~rik~lR~~~--gltQ~elA~~~gis~~~is~~E~G~~~psi~~l   76 (205)
T Consensus        30 L~L~Lt~~---Er~dl~~R~~I~~~LL~~~~~QREi~~~lG~SiA~ITRGSn~Lk~~D~~~~   88 (95)
T TIGR01321        30 LELLLTAD---EREDLGSRVRIVEELLEGEMSQREIAEKLGVSIATITRGSNALKALDPEFK   88 (95)
T ss_pred             HHHHCCHH---HHHHHHHHHHHHHHHHCCCCCHHHHHHHHCCCHHHHHHHHHHHCCCCHHHH
T ss_conf             99736863---799998799999999614897478888637616678787887516987889