HHsearch alignment for GI: 254780868 and conserved domain: TIGR00121
>TIGR00121 birA_ligase biotin-[acetyl-CoA-carboxylase] ligase; InterPro: IPR004408 The biotin operon of Escherichia coli contains 5 structural genes involved in the synthesis of biotin. Transcription of the operon is regulated via one of these proteins, the biotin ligase BirA. BirA is an asymetric protein with 3 specific domains - an N-terminal DNA-binding domain, a central catalytic domain and a C-terminal of unknown function. The ligase reaction intermediate, biotinyl-5'-AMP, is the co-repressor that triggers DNA binding by BirA. The alpha-helical N-terminal domain of the BirA protein has the helix-turn-helix structure of DNA-binding proteins with a central DNA recognition helix. BirA undergoes several conformational changes related to repressor function and the N-terminal DNA-binding function is connected to the rest of the molecule through a hinge which will allow relocation of the domains during the reaction . Biotin-binding causes a large structural change thought to facilitate ATP-binding. Two repressor molecules form the operator-repressor complex, with dimer formation occuring simultaneously with DNA binding. DNA-binding may also cause a conformational change which allows this co-operative interaction. In the dimer structure, the beta-sheets in the central domain of each monomer are arranged side-by-side to form a single, seamless beta-sheet. The apparent orthologs among the eukaryotes are larger proteins that contain a domain with high sequence homology to BirA.; GO: 0004077 biotin-[acetyl-CoA-carboxylase] ligase activity, 0006464 protein modification process.
Probab=100.00 E-value=4.9e-37 Score=250.35 Aligned_cols=233 Identities=33% Similarity=0.530 Sum_probs=206.6
Q ss_pred EEEEEECCCCHHHHHHHHHHCCCCCCEEEEECCCCCCCCCCCCCCCCCCCC-CCCCCCCCCC-CCCHHCCCHHHHHHHHH
Q ss_conf 499981648568999999973999978999824467836799853166333-3413223532-24000210137799999
Q gi|254780868|r 15 RYEFFDTISSTNDECMKRALSGDLGNLWIVASCQTAGRGRRDNKWISDKGN-LYASLLLIDS-ISKDSLTLLSFAIAVAM 92 (252)
Q Consensus 15 ~i~~~~~~~STn~~~~~~~~~~~~~~~~v~A~~Qt~GrGr~gr~W~s~~G~-l~~S~~~~~~-~~~~~~~~l~~~~~~ai 92 (252)
T Consensus 1 ~~~~~~~~~~t~~~~~~~~~~~~~~~~~~~~~~~~~g~g~~g~~W~~~~g~~~~~~~~~~~~~~p~~~~~~~~l~~~~~~ 80 (248)
T TIGR00121 1 EVIYLDVLDSTNEYLLELAKEGKPKGDLVVADKQTAGRGRRGRVWLSPEGGGLYFSLILRPDDLPKSPAPGLTLLAGLAV 80 (248)
T ss_pred CEEECCCCCCHHHHHHHHHCCCCCCCEEEEEECCCCCCCCCCCCCCCCCCCCEEEEEEECCCCCCCHHHHHHHHHHHHHH
T ss_conf 91103455534689997520456655078850323577645750137667735899975353233000002455677899
Q ss_pred HHHHHHHCCCCCEEEEEECCCEEEEC----CCCCCCCCCCCCCCCCCEEEEEECCCCCCCCCCCCCC----CCCCC-CCC
Q ss_conf 99999744542102462146506710----2211222233232258326765215444446422336----53210-023
Q gi|254780868|r 93 RSVIASTLPVGTDVKIKWPNDILVFQ----RKIAGILIETLNLKNGLQAVVVGIGLNVKHCPVDTPY----PVTSL-QRE 163 (252)
Q Consensus 93 ~~~l~~~~~~~~~~~iKWPNDi~~~~----kKi~GIL~E~~~~~~~~~~~viGiGiNi~~~~~~~~~----~~tsL-~~~ 163 (252)
T Consensus 81 ~~~~~~~~---~~~~~kwpnd~~~~~~d~~~k~~g~l~~~~~~~~~~~~~~~g~g~~~n~~~~~~~~~~~~~~~~~~~~~ 157 (248)
T TIGR00121 81 AEVLKELG---LQVGLKWPNDLLLKGNDNYKKLGGILTELTGKENRLDYVVIGIGINVNVQLPKPPDGLAEGATSLKEEL 157 (248)
T ss_pred HHHHHHHC---CCCCCCCCCEEEEECCCCCHHHHHHHHHHCCCCCCCEEEEEEECCCCCCCCCCCHHHHHHHHHHHHHHH
T ss_conf 98887510---001122675036507754012322110000133550256774021135555420123433334445554
Q ss_pred CCCCCHHHHHHHHHHHHHHHHHHHHHCCCCHHHHHH-HHHHHHCCCCEEEEEECCEEEE-EEEEEECCCCCEEEECCCCC
Q ss_conf 677897899987779999999987303556488999-9987523897799997993899-99998769874899969998
Q gi|254780868|r 164 GGCIDLKDIFSLLFQDVARVLDLWKKDTGREEIMNL-WRCFACGIGDLITIKLSYGSIL-GRFVGVDDFGYLLLEEKKGC 241 (252)
Q Consensus 164 ~~~~~~~~l~~~l~~~l~~~~~~~~~~~~~~~i~~~-~~~~~~~~gk~V~i~~~~~~~~-G~~~gId~~G~L~i~~~~G~ 241 (252)
T Consensus 158 ~~~~~~~~~~~~~~~~~~~~~~~~~~-~~~~~~~~~~~~~~~~~~~~~~~~~~~~g~~~~g~~~~~~~~g~~~~~~~d~~ 236 (248)
T TIGR00121 158 GIDLDRGELLEGFLRNFEENLELFED-GGIDEILSLKWEKLSAHIGREVKLLTGNGEIEHGIALGIDEDGALLLELGDGG 236 (248)
T ss_pred HCCCCHHHHHHHHHHHHHHHHHHHHH-CCCCHHHHHHHHHHHHHCCCEEEEEECCCEEEECHHHCCCCCCEEEEECCCCC
T ss_conf 11210467899999888887776640-46336788888887530464037751456022011111344561677417760
Q ss_pred EEEEEEEEEC
Q ss_conf 9999963110
Q gi|254780868|r 242 VRQIFTGDIF 251 (252)
Q Consensus 242 ~~~i~sGeI~ 251 (252)
T Consensus 237 ~~~~~~g~~~ 246 (248)
T TIGR00121 237 IEKILSGECS 246 (248)
T ss_pred EEEEECCEEE
T ss_conf 2343065033