>TIGR00968 3a0106s01 sulfate ABC transporter, ATP-binding protein; InterPro: IPR005666 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). These proteins are involved in the transmembrane transport of sulphate and thiosulphate.; GO: 0042626 ATPase activity coupled to transmembrane movement of substances, 0006810 transport, 0016020 membrane.

Probab=94.08  E-value=0.065  Score=32.72  Aligned_cols=149  Identities=27%  Similarity=0.378  Sum_probs=80.5

Q ss_pred             EEEEEEECCCCCCCCCEEEEEECCCCCCHHHHHHHHHHH--------HHHHHCCCCCCHHHCCCCCCC---EEEEEEECC
Q ss_conf             443456358777766439999677844078999999999--------999971985303532068221---056765237
Q gi|254780750|r  635 IANDCDLSCPNDKNSGKLWLLTGPNMGGKSTFLRQNALI--------VIMAQMGSYVPASYAHIGIVD---KLFSRVGSA  703 (920)
Q Consensus       635 VpNdi~l~~~~~~~~~~~~iiTGpNmgGKSt~lRqval~--------vilAQiG~fVPA~~a~i~~~D---~IftRiGa~  703 (920)
T Consensus        15 al~~v~l~v----~~G~lvaLLGPSGSGKsTLLR~iAGLe~pd~G~I~~~G~D~t~~~~~~R~iGFVFQ~YAlF~HlTv~   90 (241)
T TIGR00968        15 ALDDVDLEV----PTGSLVALLGPSGSGKSTLLRVIAGLEQPDSGRIILNGRDATRVKLRDREIGFVFQHYALFKHLTVR   90 (241)
T ss_pred             EEEEEEEEE----CCCEEEEEECCCCCCHHHHHHHHHCCCCCCCCEEEEEECCCCCCCCCCCCCCEEEEHHHHCCCCCHH
T ss_conf             753455574----3852798546898737899999835799984269985200221320136212277001312565111


Q ss_pred             CCCCCCCCHH-----------------HHHHHHHHHH-----------------HH--HCCCCCEEEEECCCCCCCHHHH
Q ss_conf             6611385328-----------------9999999999-----------------99--5899856999325889880567
Q gi|254780750|r  704 DNLASGRSTF-----------------MVEMIETASI-----------------LN--QATNQSFVILDEIGRGTATLDG  747 (920)
Q Consensus       704 D~l~~g~STF-----------------~vEm~e~~~I-----------------L~--~at~~SLVllDElGrGTst~DG  747 (920)
T Consensus        91 ~NiAFGL~~~p~~~k~~~~~~k~~V~~LL~lvqL~~l~~rYP~QLSGGQrQRvALARALAv~P~vLLLDEPFg---ALDA  167 (241)
T TIGR00968        91 DNIAFGLEIRPRREKHPKAKIKARVEELLELVQLEGLGDRYPNQLSGGQRQRVALARALAVEPQVLLLDEPFG---ALDA  167 (241)
T ss_pred             HHHCCCCEEECCCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCHHHHHHHHHHHHCCCCEEEEECCHH---HHHH
T ss_conf             0100142230210267578899999999998746544312742035733789999988633981576208714---5428


Q ss_pred             ---HHHHHHHHHHHHHHCCCEEEEECCCH-HHHHHHHHCCCEEEEEEE
Q ss_conf             ---99999999999972698499974875-797664306885899999
Q gi|254780750|r  748 ---LSIAWATIEYLHETNRCRGLLATHFH-ELTDLSKSLKRFHNATLQ  791 (920)
Q Consensus       748 ---~aiA~aile~l~~~~~~~~lfaTHy~-eL~~l~~~~~~v~n~~~~  791 (920)
T Consensus       168 kvRk~L-R~WLR~LH~e~~~T~VfVTHD~~EA~evAd~ivv~~~G~i~  214 (241)
T TIGR00968       168 KVRKEL-RAWLRKLHDEVHVTTVFVTHDQEEAMEVADRIVVLSNGKIE  214 (241)
T ss_pred             HHHHHH-HHHHHHHCCEEEEEEEEEECCHHHHHHHHHHHHHHCCCCEE
T ss_conf             999999-99998740305677999862858998887440132178278