>TIGR02139 permease_CysT sulfate ABC transporter, permease protein CysT; InterPro: IPR011865 ABC transporters belong to the ATP-Binding Cassette (ABC) superfamily, which uses the hydrolysis of ATP to energize diverse biological systems. ABC transporters are minimally constituted of two conserved regions: a highly conserved ATP binding cassette (ABC) and a less conserved transmembrane domain (TMD). These regions can be found on the same protein or on two different ones. Most ABC transporters function as a dimer and therefore are constituted of four domains, two ABC modules and two TMDs. ABC transporters are involved in the export or import of a wide variety of substrates ranging from small ions to macromolecules. The major function of ABC import systems is to provide essential nutrients to bacteria. They are found only in prokaryotes and their four constitutive domains are usually encoded by independent polypeptides (two ABC proteins and two TMD proteins). Prokaryotic importers require additional extracytoplasmic binding proteins (one or more per systems) for function. In contrast, export systems are involved in the extrusion of noxious substances, the export of extracellular toxins and the targeting of membrane components. They are found in all living organisms and in general the TMD is fused to the ABC module in a variety of combinations. Some eukaryotic exporters encode the four domains on the same polypeptide chain . The ABC module (approximately two hundred amino acid residues) is known to bind and hydrolyze ATP, thereby coupling transport to ATP hydrolysis in a large number of biological processes. The cassette is duplicated in several subfamilies. Its primary sequence is highly conserved, displaying a typical phosphate-binding loop: Walker A, and a magnesium binding site: Walker B. Besides these two regions, three other conserved motifs are present in the ABC cassette: the switch region which contains a histidine loop, postulated to polarize the attaching water molecule for hydrolysis, the signature conserved motif (LSGGQ) specific to the ABC transporter, and the Q-motif (between Walker A and the signature), which interacts with the gamma phosphate through a water bond. The Walker A, Walker B, Q-loop and switch region form the nucleotide binding site , , . The 3D structure of a monomeric ABC module adopts a stubby L-shape with two distinct arms. ArmI (mainly beta-strand) contains Walker A and Walker B. The important residues for ATP hydrolysis and/or binding are located in the P-loop. The ATP-binding pocket is located at the extremity of armI. The perpendicular armII contains mostly the alpha helical subdomain with the signature motif. It only seems to be required for structural integrity of the ABC module. ArmII is in direct contact with the TMD. The hinge between armI and armII contains both the histidine loop and the Q-loop, making contact with the gamma phosphate of the ATP molecule. ATP hydrolysis leads to a conformational change that could facilitate ADP release. In the dimer the two ABC cassettes contact each other through hydrophobic interactions at the antiparallel beta-sheet of armI by a two-fold axis , , , , , . Proteins known to belong to this family are classified in several functional subfamilies depending on the substrate used (for further information see http://www.tcdb.org/tcdb/index.php?tc=3.A.1). This entry represents CysT, one of two homologous, tandem permeases in the sulphate ABC transporter system; the other is CysW (IPR011866 from INTERPRO). The sulphate transporter has been described in Escherichia coli as transporting sulphate, thiosulphate, selenate, and selenite. Sulphate transporters may also transport molybdate ion if a specific molybdate transporter is not present.; GO: 0015116 sulfate transmembrane transporter activity, 0008272 sulfate transport, 0009276 1-2nm peptidoglycan-based cell wall, 0016021 integral to membrane.

Probab=100.00  E-value=8.8e-44  Score=249.71  Aligned_cols=239  Identities=15%  Similarity=0.270  Sum_probs=211.4

Q ss_pred             HHHHHHHHHHHHCCCCCCCCCCC--CHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCHHH
Q ss_conf             99999999997412322100011--0013467643835479999999999997656652111122100022115651267
Q gi|255764501|r  292 FFLISCAIWFFILPLLAIIIEGM--NAKLLLRLLQQSGLWSSFFNSIYIAINAGVLCMIFTIMLLWTKRELRLRRLKFFN  369 (535)
Q Consensus       292 ~~~~~~~~l~~i~pl~~ii~~~~--~~~~~~~~~~~~~~~~a~~~Sl~~s~~~~~i~~~l~l~~a~~~~~~~~~~~~~~~  369 (535)
T Consensus        10 G~tl~YL~livllPl~al~~k~~~~gw~~FW~~~~~P~vlaay~~sf~~Al~Aa~~N~vFG~l~AWVLVRY~F----PGK   85 (265)
T TIGR02139        10 GVTLLYLSLIVLLPLAALFLKASQLGWAGFWQIITEPRVLAAYKLSFGTALIAALINAVFGTLLAWVLVRYRF----PGK   85 (265)
T ss_pred             HHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC----CHH
T ss_conf             9999999999999999999998327988999998538999999999999999999999999999889861247----505


Q ss_pred             HHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCC----------CCCCCCCCCEEEEEEECHHHHHHHHHHHHHCCHHHHHH
Q ss_conf             99999997465532376676643012346775----------66553443102465212156999999897289778999
Q gi|255764501|r  370 HIFELSELLILAVPSIVLAVGFFLLLKNTVNL----------TSSSYSLIIVTNALMAVPYAVKILENPMYDLAERYNAL  439 (535)
Q Consensus       370 ~~~~~~~~lp~~iP~iv~~~~~~~~~~~~~~~----------~~~~~~~iila~~~~~lP~~~~~l~~~l~~i~~~l~ea  439 (535)
T Consensus        86 ri~DAlVDLPFALPTAVAGIaL~TlY~~NGWiG~~l~~lGIKvAfTplGi~~Al~FvsLPFVVRTVQPVL~e~~~E~EEA  165 (265)
T TIGR02139        86 RIVDALVDLPFALPTAVAGIALATLYAPNGWIGSFLEPLGIKVAFTPLGIVVALVFVSLPFVVRTVQPVLEEIEKELEEA  165 (265)
T ss_pred             HHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCCHHHHHHCCCEEEEECCCEEEEEEEECCCCEEEEECCCCCCCCHHHHHH
T ss_conf             77766623354203479999999996288940125855498788720101434233258825731143000588648999


Q ss_pred             HHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCEEEEECCC---CCCHHHHHHHHHHHCCCCHHHHHHHHHHH
Q ss_conf             997397876999999999546899999999999985110116786489---83028989998861798136999999999
Q gi|255764501|r  440 CISLQIKGINRLYLIEFKALKRLMAQTFSFSCLLSIGDFGIIALFGND---NFCTLPCYLYQQLGSYRQSDAVVTALLLL  516 (535)
Q Consensus       440 A~~lGa~~~~~f~~I~lPll~p~i~~~~~l~f~~s~~e~~~~~ll~~~---~~~Tl~~~i~~~~~~~~~~~a~a~a~il~  516 (535)
T Consensus       166 A~~LGAS~w~tF~~vilP~L~PALLTG~ALaFARa~GEYGSViFIAGN~P~~tEI~PLLI~~kLEqYDY~gATaIA~vmL  245 (265)
T TIGR02139       166 AASLGASRWQTFWKVILPALLPALLTGFALAFARAVGEYGSVIFIAGNLPMKTEIAPLLIFIKLEQYDYAGATAIAVVML  245 (265)
T ss_pred             HHHHCCCCHHEEEEEECCCCCCHHHHHHHHHHHHHHHHHHCEEEECCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
T ss_conf             76516882000222331444006999789988754323330002226888067889999977754412378999999999


Q ss_pred             HHHHHHHHHHHHHHCCCC
Q ss_conf             999999999999714668
Q gi|255764501|r  517 SLCLGLFSLLEYLSGKEY  534 (535)
Q Consensus       517 ~i~~~~~~l~~~l~~r~~  534 (535)
T Consensus       246 ~~SF~~Ll~IN~lQ~~~~  263 (265)
T TIGR02139       246 LISFVLLLFINLLQWRAL  263 (265)
T ss_pred             HHHHHHHHHHHHHHHHHC
T ss_conf             999999999999999750