>TIGR00886 2A0108 nitrite transporter; InterPro: IPR004737 This family represents nitrate/nitrite antiporters in bacteria, fungi, algae and marine diatoms. Nitrate transporters in Escherichia coli are involved in excretion of nitrite produced by the dissimilatory reduction of nitrate. NarK is polytopic membrane protein with 12 transmembrane domains which is involved in nitrate uptake and nitrite excretion and is thought to function as a nitrate/nitrite antiporter. At low concentrations of nitrate, NarK mediates the electrogenic excretion of nitrite rather than nitrate/nitrite exchange. This process prevents intracellular accumulation of toxic levels of nitrite and allows further detoxification in the periplasm through the action of nitrite reductase . In the opportunistic fungal pathogen Aspergillus fumigatus the nitrate transporter crnA clusters with nitrite reductase (niiA) and nitrate reductase (niaD). NiaD, niiA and crnA are induced by nitrate and repressed by ammonium at the transcriptional level . In Hebeloma cylindrosporum the nitrate transporter polypeptide (NRT2) is characterised by 12 transmembrane domains and presents both a long putative intracellular loop and a short C-terminal tail, two structural features which distinguish fungal high-affinity transporters from their plant homologues. Transcription is repressed by ammonium and strongly stimulated by nitrate but also by organic nitrogen or nitrogen deficiency. ; GO: 0015103 inorganic anion transmembrane transporter activity, 0015698 inorganic anion transport, 0016021 integral to membrane.

Probab=99.96 E-value=1.6e-26 Score=149.26 Aligned_cols=337 Identities=15% Similarity=0.133 Sum_probs=227.2 Q ss_pred HHHHHHHHHHHHHH-HHHHHHHHHH---HHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCHHHHHHHHHHHHHHHH Q ss_conf 99999999999987-3899899999---9809998999999999999999999999999985262899999999764321 Q gi|254780843|r 15 YIFILFFLFGGITS-LNSILVPKLQ---NSFSLTYLQAMLVEAIFFSCYFFFSIPAGMFIQRYGYIKGICTGLLIMSLGC 90 (420) Q Consensus 15 ~i~~~ff~~g~~~~-~~~~~~p~l~---~~~~~s~~~~g~i~s~~~~~~~i~~~~~G~l~Dr~Grr~~l~~~~~~~~i~~ 90 (420) T Consensus 4 ~~S~~~F~lsF~~W~~~~~L~~~~~~G~~dl~Ls~~Q~~~~~~~p~~~g~~~R~~~G~l~d~~GpR~~~~~~~~~~~IP~ 83 (472) T TIGR00886 4 FFSWFGFFLSFLVWFAFSPLAVQIIKGKDDLGLSTAQLGNLVAVPVLAGAVLRIILGFLVDKFGPRKTTTLSLLLLAIPC 83 (472) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHH T ss_conf 45788999999999998777865415763314799999999999999999999998863477671899999999999999 Q ss_pred HCCHHCCC--CCHHHHHHHHHHHHHHHHHHHHHHHHCCHHCCCCHHHHHHHHHHHHHHCCCHHHHHHHHHH---HHHH-- Q ss_conf 00000013--2024678999887775678887653100001230357887766443110000345478888---8641-- Q gi|254780843|r 91 ILFTATIE--ITTFKVFLIALCILAIGVVIIQVALNPFISLLGDPNTAVSRLTFAQFFNSLGTAIFPYIGS---VLML-- 163 (420) Q Consensus 91 ll~~~a~~--~~~~~~~~~~~~i~g~g~~~~~~~~~~~~~~~~~~~~r~~~~~~~~~~~~~g~~~g~~~~~---~l~~-- 163 (420) T Consensus 84 ~~~~~~~~~p~~s~~~L~~~rlf~Gi~Gg~F-a~~~~~~s~fFp~~~~GtA~gl~aG~GN~G~~~~~~~~Pa~f~i~~~~ 162 (472) T TIGR00886 84 LLAGLAVQDPSTSYSVLLLLRLFIGIAGGSF-ASCMPWISFFFPKKIQGTALGLAAGWGNMGGGVAQFVMPALFAIIASL 162 (472) T ss_pred HHHHHHCCCCCCCHHHHHHHHHHHHHHHHHH-HHHHHHHHCCCCCCHHHHHHHHHHCHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 9998412689989999999999996755468-876656630688220146758861432678999999999999999986 Q ss_pred -------------CCCCCHHHHHHHHHHHHHHHHHHHHHCCCCCCCHH---H---------HHHH-------HHHHHCCC Q ss_conf -------------23420467765555577898886420011211001---3---------4555-------54321012 Q gi|254780843|r 164 -------------GNLASPNTSMLADTMKDYQTDTARVISQMYLVLAI---I---------LFLA-------TWLCWMQR 211 (420) Q Consensus 164 -------------~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~---~---------~~~~-------~~~~~~~~ 211 (420) T Consensus 163 ~~~~f~G~p~~F~~~~~~g~~~~~~~~~i~~~~~~l~~~~~~~~~~~~ws~r~~~ARGl~v~~~~~~~~~~~~~~~~~~~ 242 (472) T TIGR00886 163 IKGAFGGLPQTFDAHLAWGWAFVIVPALILLLIALLIFFVVADTPPGKWSERHKSARGLEVTTLKDDYFLLIMNLPATAK 242 (472) T ss_pred HCCCCCCCCCCEEEECCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCHHHHCCCHHCCCCCCCC T ss_conf 22112789840110136504467698999999999999999862467644577655775410335430320102577754 Q ss_pred CCCH-----------------------------------HHHHHHCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHH Q ss_conf 3101-----------------------------------23321000111122211111110001110001355677899 Q gi|254780843|r 212 NSFA-----------------------------------DHKRNHISFLKTLDILANPRFTMGAVCIFLYVGAEVAIGSI 256 (420) Q Consensus 212 ~~~~-----------------------------------~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 256 (420) T Consensus 243 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~l~~~~~~~~~~~~~~~~~~~~~~~~~~~~tW~~~l~Y~~tFGsflg~~s~ 322 (472) T TIGR00886 243 LSVKSARLSKIAFLVAALKVVVEPLLGTEALATYNIWVLNAIIESLSLKEQLKVFRDKHTWILALLYSVTFGSFLGVSSI 322 (472) T ss_pred CCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCHHHHHCCCCHHHHHHHHHHHCCHHHHHHHH T ss_conf 45201003677767754223210212133233443577788741556432798743631477776565224069999999 Q ss_pred HHH---HHHHHCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCCHHHC-----CCHHHHHHHHHHHHHHHHHH-CC---- Q ss_conf 998---754201222101246888999987643100111111000000-----00012455554567689962-23---- Q gi|254780843|r 257 MAN---YLMRHDTLHLDGISAGQHTAIYWGSAMIGRFIGTWILSRFSA-----EKTLCAFATTACSLVILSSY-TT---- 323 (420) Q Consensus 257 ~~~---~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-----~~~~~~~~~~~~~~~~~~~~-~~---- 323 (420) T Consensus 323 ~~~vfl~~~--~~fg~~~~~aG~~a~~~~~~g~~~RP~GG~lsD~~gg~~g~~ar~~~~~~~~~~~g~~~~~~~~~~~~~ 400 (472) T TIGR00886 323 FAMVFLLFK--DQFGLSKVQAGAYASLGGLLGLLARPLGGLLSDRLGGRFGTRARKLLMSFLGVAMGAALVVLGLVGPGS 400 (472) T ss_pred HHHHHHHHC--CCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCCC T ss_conf 988998741--679988733999999999898886376668998726866824999999999999987655330016886 Q ss_pred ---HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf ---3689999999999999999999999996301 Q gi|254780843|r 324 ---GFISGWSLIAVGLFNSIMFPTIFSLASASLE 354 (420) Q Consensus 324 ---~~~~~~~~~~~g~~~~~~~~~~~~~~~~~~~ 354 (420) T Consensus 401 ~~~l~~~~~~~~~~~~f~~~GnGs~F~~vP~~~~ 434 (472) T TIGR00886 401 SGSLAVFIVLFVALFFFVGAGNGSTFALVPHIFR 434 (472) T ss_pred CHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCH T ss_conf 4058899999999999863310654032243262

HHsearch alignment for GI: 254780843 and conserved domain: TIGR00886