>TIGR01817 nifA Nif-specific regulatory protein; InterPro: IPR010113 This entry represents NifA, a DNA-binding regulatory protein for nitrogen fixation. Not included in this group are: the homologue in Aquifex aeolicus (which lacks nitrogenase), transcriptional activators of alternative nitrogenases (VFe or FeFe instead of MoFe), and truncated forms. In diazotrophic proteobacteria, the sigma54-dependent activator NifA activates transcription of the nif (nitrogen fixation) genes by a conserved mechanism common to members of the enhancer binding protein family. Although NifA proteins have similar domain structures, both transcriptional regulation of nifA expression and posttranslational regulation of NifA activity by oxygen and fixed nitrogen vary significantly from one organism to another. In Klebsiella pneumoniae and Azotobacter vinelandii, nifA is co-ordinately transcribed with a second gene, nifL, whose product inhibits NifA activity in response to oxygen and fixed nitrogen .; GO: 0003677 DNA binding, 0016563 transcription activator activity, 0009399 nitrogen fixation.

Probab=99.50 E-value=1.2e-13 Score=103.02 Aligned_cols=205 Identities=22% Similarity=0.294 Sum_probs=143.2 Q ss_pred HHCCCCCHHHHCCHHHHHHHHHH-HHHHHHHCCCCCCCEEEECCCCCCHHHHHHHHHHHC---CCCCCCCCCCCCCCH-- Q ss_conf 75078987782397999999999-999866146776707997378855778999999861---898531257644334-- Q gi|254780552|r 20 SLLRPRTLEEFTGQVEACSNLKV-FIEAAKARAEALDHVLFVGPPGLGKTTLAQVVAREL---GVNFRSTSGPVIAKA-- 93 (334) Q Consensus 20 ~~lRP~~l~dviGQ~~~~~~l~~-~i~a~~~~~~~~~h~Lf~GPpG~GKTtlA~iiA~~l---~~~~~~~s~~~~~~~-- 93 (334) T Consensus 204 ~~~~~~~~~~i~G~Spam~~v~~~~~~vA~~----nSTVLlRGESGTGKEl~A~AIH~~SpR~~~PFVK~NCAALse~lL 279 (574) T TIGR01817 204 ARRRSGKEDGIVGKSPAMRQVVDQIKVVARS----NSTVLLRGESGTGKELIAKAIHELSPRAKRPFVKLNCAALSETLL 279 (574) T ss_pred HHHHCCCCCCCCCCCHHHHHHHHHHHHHCCC----CCEEEEECCCCCCHHHHHHHHCCCCCCCCCCCEEEECCCCCCCHH T ss_conf 2331234474012478999999886520131----766785056574433444234046645578854500644776112 Q ss_pred -HHH----HHHHHHH----------HCCCHHHHHHHHHCCHHHHHHHHHHHHCCCCCCCCCCCCCCCEEECCCCCCEEEE Q ss_conf -676----6666641----------0163788875761698999999998634751002567876520004667400552 Q gi|254780552|r 94 -GDL----AALLTNL----------EDRDVLFIDEIHRLSIIVEEILYPAMEDFQLDLMVGEGPSARSVKINLSRFTLIA 158 (334) Q Consensus 94 -~dl----~~~~~~~----------~~~~vlfiDEihrl~~~~q~~Ll~~mE~~~i~i~~~~~~~a~~~~~~~~~f~lI~ 158 (334) T Consensus 280 ESELFGHEKGAFTGA~~~RkGRFElAdGGTLFLDEIGEISPaFQAKLLRVLQEGEFERV----GG~~TlKVd---VRlva 352 (574) T TIGR01817 280 ESELFGHEKGAFTGAVAQRKGRFELADGGTLFLDEIGEISPAFQAKLLRVLQEGEFERV----GGNRTLKVD---VRLVA 352 (574) T ss_pred HHHHHCCCCHHHHHHHHHCCCCEEECCCCCCCCCCCCCCCHHHHHHHHHHHHCCCEEEE----CCCEEEEEE---EEEEE T ss_conf 45451343014688875177753302788320000146785688899887521002532----787248873---67886 Q ss_pred CCCCC---------------------CCCCHHHHHCCCCEEECCCCCHHHHH-HHHHHHHHH--CC-CHHHHHHHHHHHC Q ss_conf 04554---------------------33554544201206732645479999-987776541--21-0111111123320 Q gi|254780552|r 159 ATTRV---------------------GLLTNPLQDRFGIPIRLNFYEIEDLK-TIVQRGAKL--TG-LAVTDEAACEIAM 213 (334) Q Consensus 159 ATt~~---------------------~~l~~~l~sR~~~~~~~~~~~~~el~-~il~~~~~~--~~-i~~~~~al~~ia~ 213 (334) T Consensus 353 ATNrdLE~aV~~GeFRaDLYYRinVvPl~lPPLRER~~--------DIP~LA~~fL~kf~~en~R~mL~~~~~Ai~~Lm~ 424 (574) T TIGR01817 353 ATNRDLEEAVAKGEFRADLYYRINVVPLILPPLRERRE--------DIPLLAEAFLEKFNRENGRPMLTLSPSAIRVLMS 424 (574) T ss_pred CCCCCHHHHHHCCCCCCHHHHHHHHHHHHCCCCCCCCC--------HHHHHHHHHHHHHHHHHCCCEEEECHHHHHHHHC T ss_conf 13735588972789730235544222340787778731--------1689999999987665187203226789989751 Q ss_pred CC-CCCHHHHHHHHHHHHHHHHHHCCCCCCHHHH Q ss_conf 22-1015678877754333455415886427787 Q gi|254780552|r 214 RS-RGTPRIAGRLLRRVRDFAEVAHAKTITREIA 246 (334) Q Consensus 214 ~s-~Gd~R~AlnlLe~v~d~a~~~~~~~i~~~~~ 246 (334) T Consensus 425 c~wPGNVRELENC~eRt---AtLs~~~~It~~df 455 (574) T TIGR01817 425 CKWPGNVRELENCVERT---ATLSRSGTITRSDF 455 (574) T ss_pred CCCCCCCEEHHHHHHHH---HHHCCCCCCCCCEE T ss_conf 78999740044378778---75416885164236

HHsearch alignment for GI: 254780552 and conserved domain: TIGR01817