>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=98.15  E-value=3.1e-06  Score=56.27  Aligned_cols=216  Identities=20%  Similarity=0.278  Sum_probs=137.7

Q ss_pred             HHHHHHHHHHHHCCCCCCC-----CCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHH-HHHCCCCHHHHHHHHHHHHHHC
Q ss_conf             9999988988513333574-----111111002478779999999999987567754-4412786889997898888761
Q gi|254780172|r  148 LFGLFPIFSFFVLYGGLGL-----SIVETSLWGGLLVTLVISFFGIIISMPLGILLA-LGRNSNIPVLRYACITFIELFR  221 (386)
Q Consensus       148 ~~~~~pil~~~Ll~gg~gl-----~~V~t~~~gGl~~Tl~l~~~~~~~~~~lG~lla-l~r~s~~~~l~~~~~~~ie~~R  221 (386)
T Consensus        18 livllPl~al~~k~~~~gw~~FW~~~~~P~vlaay~~sf~~Al~Aa~~N~vFG~l~AWVLVRY~F-PGKri~DAlVDLPF   96 (265)
T TIGR02139        18 LIVLLPLAALFLKASQLGWAGFWQIITEPRVLAAYKLSFGTALIAALINAVFGTLLAWVLVRYRF-PGKRIVDALVDLPF   96 (265)
T ss_pred             HHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC-CHHHHHHHHHCCCC
T ss_conf             99999999999998327988999998538999999999999999999999999999889861247-50577766623354


Q ss_pred             CCCH------HHHHHH-----HHHHHHHHCCCCCCCC--HHHHHHHHHHHHHHHHHHHHHHHHHHHCCHHHHHHHHHHCC
Q ss_conf             4722------899999-----9997664155887738--79999999999989998999999998458667899999621
Q gi|254780172|r  222 GVPL------VTVLFM-----ASIMLPLFLPDTWDVD--KLLRALLGVSAFASAYIAEVLRGGLQSISKGQFEAANSLGL  288 (386)
Q Consensus       222 g~Pl------i~~lf~-----~~~~lp~~lp~g~~~~--~~~~a~i~l~l~~aAy~aEi~Rggl~svp~GQ~EAA~alGl  288 (386)
T Consensus        97 ALPTAVAGIaL~TlY~~NGWiG~~l~----~lGIKvAfTpl-Gi~~Al~FvsLPFVVRTVQPVL~e~~~E~EEAA~~LGA  171 (265)
T TIGR02139        97 ALPTAVAGIALATLYAPNGWIGSFLE----PLGIKVAFTPL-GIVVALVFVSLPFVVRTVQPVLEEIEKELEEAAASLGA  171 (265)
T ss_pred             CCHHHHHHHHHHHHHCCCCCCHHHHH----HCCCEEEEECC-CEEEEEEEECCCCEEEEECCCCCCCCHHHHHHHHHHCC
T ss_conf             20347999999999628894012585----54987887201-01434233258825731143000588648999765168


Q ss_pred             HHHHHHHHHHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH------------CCCCCHHHHHHH
Q ss_conf             68999999996998998620047999999961289999999999999999741010------------035513699999
Q gi|254780172|r  289 SYLQKMRLIIMPQVIKRVIPGIVNTFIGLFKDSSLISIINMFDLLGIVRVNFSEST------------WISSVTPTTGLI  356 (386)
Q Consensus       289 s~~q~~~~IilPQAlr~~iP~l~n~~i~l~KdTsL~~~Ig~~el~~~~~~~~~~~~------------~~~~~~~~e~y~  356 (386)
T Consensus       172 S~w~tF~~vilP~L~----PA-------LLTG~ALaFARa~GEY-GSViFIAGN~P~~tEI~PLLI~~kLEq-YDY~gAT  238 (265)
T TIGR02139       172 SRWQTFWKVILPALL----PA-------LLTGFALAFARAVGEY-GSVIFIAGNLPMKTEIAPLLIFIKLEQ-YDYAGAT  238 (265)
T ss_pred             CCHHEEEEEECCCCC----CH-------HHHHHHHHHHHHHHHH-HCEEEECCCCCCHHHHHHHHHHHHHHH-HHHHHHH
T ss_conf             820002223314440----06-------9997899887543233-300022268880678899999777544-1237899


Q ss_pred             HHHHHHHHHHHHHHHHHHHHHHHHCC
Q ss_conf             99999999999999999999998433
Q gi|254780172|r  357 FIGFVFWIFCFSISLYSVFIEKTLHK  382 (386)
Q Consensus       357 ~~a~iY~ii~~~ls~~~~~lE~rl~~  382 (386)
T Consensus       239 aIA~vmL~~SF~~Ll~IN~lQ~~~~r  264 (265)
T TIGR02139       239 AIAVVMLLISFVLLLFINLLQWRALR  264 (265)
T ss_pred             HHHHHHHHHHHHHHHHHHHHHHHHCC
T ss_conf             99999999999999999999997506