>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=0  Score=289.19  Aligned_cols=247  Identities=23%  Similarity=0.411  Sum_probs=218.0

Q ss_pred             HHHHHHHHHHHHHHHHCCCCHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHH
Q ss_conf             99999999999999741688679999956989999999999999999999999999999999707996179999999999
Q gi|255764501|r   20 SCFLNFIFFLVVYSLWRHMPLISWREFMEDSYLWHVIGFTFWQALLSTLLSVIPSIFLAKSLFRRHFPGRILFLRLHTMI   99 (535)
Q Consensus        20 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~l~nTl~~a~~s~~~~~~ig~~~A~~~~~~~~~~~~~~~~~~~lp   99 (535)
T Consensus        16 L~livllPl~al~~k~~~~gw~~FW~~~~~P~vlaay~~sf~~Al~Aa~~N~vFG~l~AWVLVRY~FPGKri~DAlVDLP   95 (265)
T TIGR02139        16 LSLIVLLPLAALFLKASQLGWAGFWQIITEPRVLAAYKLSFGTALIAALINAVFGTLLAWVLVRYRFPGKRIVDALVDLP   95 (265)
T ss_pred             HHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHCCC
T ss_conf             99999999999999983279889999985389999999999999999999999999998898612475057776662335


Q ss_pred             HHHHHHHHHHHHHHHHHCCCCCCCHHHHCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHCCC
Q ss_conf             98899999999999972278542103315888764333269999999998766548999999850888999999862147
Q gi|255764501|r  100 FVLPVFVVIMGVFTVYGRTGWIAQLCQWLGIVYQFNLYGIKGILLVHVFFNMPLAIRMLLQALDSISIEQRQLALQLGMN  179 (535)
Q Consensus       100 ~~~P~~v~~~~~~~~~~~~G~~~~~l~~~g~~~~~~~~~~~~iii~~~~~~~p~~~l~~~~~l~~i~~~~~eaA~~lGas  179 (535)
T Consensus        96 FALPTAVAGIaL~TlY~~NGWiG~~l~~lGIKvA---fTplGi~~Al~FvsLPFVVRTVQPVL~e~~~E~EEAA~~LGAS  172 (265)
T TIGR02139        96 FALPTAVAGIALATLYAPNGWIGSFLEPLGIKVA---FTPLGIVVALVFVSLPFVVRTVQPVLEEIEKELEEAAASLGAS  172 (265)
T ss_pred             CCCHHHHHHHHHHHHHCCCCCCHHHHHHCCCEEE---EECCCEEEEEEEECCCCEEEEECCCCCCCCHHHHHHHHHHCCC
T ss_conf             4203479999999996288940125855498788---7201014342332588257311430005886489997651688


Q ss_pred             HHHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCHHHHHHCCC-CCCCC-HHHHHHHHHHHHHHCCCCHHHHHHHHHHHHHH
Q ss_conf             14677544200166402457778777652584156640366-55441-14555677765320000001345578899999
Q gi|255764501|r  180 PWYFFRFVEWPYLRRQILPTSSLIFMLCFASFATVLTLGGG-PASTT-IELAIYQSLSYDFDLNKAAFLSLVQIFCCLSL  257 (535)
Q Consensus       180 ~~~~f~~v~lP~~~p~i~~~~~l~f~~~~~~f~~~~~lgg~-~~~~t-l~~~iy~~~~~~~~~~~aa~la~il~~~~~~~  257 (535)
T Consensus       173 ~w~tF~~vilP~L~PALLTG~ALaFARa~GEYGSViFIAGN~P~~tEI~PLLI~~kLE-qYDY~gATaIA~vmL~~SF~~  251 (265)
T TIGR02139       173 RWQTFWKVILPALLPALLTGFALAFARAVGEYGSVIFIAGNLPMKTEIAPLLIFIKLE-QYDYAGATAIAVVMLLISFVL  251 (265)
T ss_pred             CHHEEEEEECCCCCCHHHHHHHHHHHHHHHHHHCEEEECCCCCCHHHHHHHHHHHHHH-HHHHHHHHHHHHHHHHHHHHH
T ss_conf             2000222331444006999789988754323330002226888067889999977754-412378999999999999999


Q ss_pred             HHHHCCCCCCCCC
Q ss_conf             8530134332211
Q gi|255764501|r  258 VLFNQKFNVSFSS  270 (535)
Q Consensus       258 ~~~~~~~~~~~~~  270 (535)
T Consensus       252 Ll~IN~lQ~~~~r  264 (265)
T TIGR02139       252 LLFINLLQWRALR  264 (265)
T ss_pred             HHHHHHHHHHHCC
T ss_conf             9999999997506