HHsearch alignment for GI: 254780705 and conserved domain: TIGR02138

>TIGR02138 phosphate_pstC phosphate ABC transporter, permease protein PstC; InterPro: IPR011864 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). The typical operon for the high affinity inorganic phosphate ABC transporter encodes an ATP-binding protein, a phosphate-binding protein, and two permease proteins. This family describes PstC, which is homologous to PstA (IPR005672 from INTERPRO). In the Escherichia coli, this transport system is induced when the concentration of extrallular inorganic phosphate is low. A constitutive, lower affinity transporter operates otherwise.; GO: 0005315 inorganic phosphate transmembrane transporter activity, 0006817 phosphate transport, 0016021 integral to membrane.
Probab=100.00  E-value=0  Score=416.64  Aligned_cols=287  Identities=31%  Similarity=0.425  Sum_probs=246.1

Q ss_pred             HHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCEEEEEEEEEEEECHHHHCCCCCCCCCHHHHHCCCHHHHHHHHHHHHC
Q ss_conf             68999999999999999999999997614446216899999873088890657656679888630458999999999631
Q gi|254780705|r   18 EWLFRFYCVVAVLVVFVFLILLLSSIVSKGIGALWQTHISLPIEFSETIVDPQKKRFMDPAILLRADYNLLVRKALARKL   97 (425)
Q Consensus        18 EkrFr~yGi~AI~ial~fL~~Ll~sI~s~G~~AF~qT~I~l~V~~d~~~id~~~~~~~d~~~l~~~~~~~li~~aL~~~~   97 (425)
T Consensus         1 ~~~~~~~~~~~~~~~~~~~~~i~~fl~~~a~~~f~~~g~s~---------------------------------------   41 (317)
T TIGR02138         1 EKIFKGLLLIAAVIIVLVLLLIVLFLLIEAIPAFEKNGISL---------------------------------------   41 (317)
T ss_pred             CHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCC---------------------------------------
T ss_conf             84899899999999999999999999997788887458740---------------------------------------


Q ss_pred             CCCCCCHHHHHHHHHHHCCHHHHHHHHHHHHCHHHCCCEEEEEEEECCCCHHHHCCCCCCCCHHCCCCHHHHHHHHHHHH
Q ss_conf             45666603489899873001689999997406321597478999704530233034556530000599999999999987
Q gi|254780705|r   98 SISDSNHALLRQASQMLSTTARYHLRKTLMTDPSLIGKTVEVSLLASANIDSALKGYLYSPANVHRMSDYQWKWFQKLDS  177 (425)
Q Consensus        98 p~~~~~r~~kr~l~~liS~~a~~~Lrd~v~~np~liG~t~~~~llAsddvD~~~KG~i~r~e~~rrisd~ql~~~d~L~~  177 (425)
T Consensus        42 -----------------------------------------~~f~~~~~W~~~~~~~-----------------------   57 (317)
T TIGR02138        42 -----------------------------------------LNFLTGTVWDPDSKGA-----------------------   57 (317)
T ss_pred             -----------------------------------------EEEEECCCCCCCCCCC-----------------------
T ss_conf             -----------------------------------------0014312005543310-----------------------


Q ss_pred             HHHHHHCCCCHHHCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHH
Q ss_conf             45664112202321344321101202667899999999999999999999999998643730245678989988765336
Q gi|254780705|r  178 DGALFLDFNYGFFINGASSRPEVAGIGVAVVGSLYMMLIVIGLSFPLGIASAIYLEEFSHKGFFSSFVQANINNLASVPS  257 (425)
Q Consensus       178 ~g~i~~~fn~~f~t~~~s~~~e~~Gi~~ai~gTl~~~~ia~~ia~pigv~~aiyl~e~a~~~~~~~~i~~~i~~la~vPS  257 (425)
T Consensus        58 --------------~a~~p~~~~yG~l~~i~GTl~~~~~A~liA~P~~i~~Aif~~e~aP~-~~~~~l~~~~ELLAgIPS  122 (317)
T TIGR02138        58 --------------EADTPVQEQYGALPLIVGTLITSLIAILIAVPVGIGIAIFLSEIAPK-RVKSVLKPVVELLAGIPS  122 (317)
T ss_pred             --------------CCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCH-HHHHHHHHHHHHHHHHHH
T ss_conf             --------------15787302456699999999999999999999999999999985251-135699999999722359


Q ss_pred             HHHHHHHHHHHHHHHCC------------------C------CCHHHHHHHHHHHHHHHHHHHHHHHHHHHCHHHHHHHH
Q ss_conf             99999999999986266------------------6------30046897533454366899999999851106789899
Q gi|254780705|r  258 IVYGILGSAVLINFFKM------------------P------RSTALVGGLILALMTLPSIIIATGVALRTVPSSIRSAA  313 (425)
Q Consensus       258 Iv~Gl~gl~~~~~~~~~------------------~------~~~~l~g~~~l~~m~lP~i~~~~~~al~~vp~~~~eaa  313 (425)
T Consensus       123 VvYG~wG~~~l~P~l~~~~~~~~~~~~~~iP~~~~~~~~~~~G~~~L~a~~vL~IMIlPt~as~s~D~~~~VP~~~kea~  202 (317)
T TIGR02138       123 VVYGFWGLFVLVPFLKDHFQPFLGSNFGWIPLFGQLFSGPPNGYGLLTAGIVLAIMILPTIASISRDALRAVPRSYKEAS  202 (317)
T ss_pred             HHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCHHHHHHH
T ss_conf             99999999999999999886786531353232122368998316899999999999999999999999973556788898


Q ss_pred             HHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC--CCCCCCCH-HHHHHHHHHHHHCCCCC
Q ss_conf             8707721277778839753325899999999998767799999854321013--66561344-55799999986036650
Q gi|254780705|r  314 LGLGASKVQTVFHHVLPLAMPAILTGSTVSLARALGETAPLLFVGMVAFVTD--YPVGVTDI-ATAFPVQIYLWAADAER  390 (425)
Q Consensus       314 ~~LGas~~~~~~~v~lp~a~pgi~~g~il~~~ra~GEta~ll~~~~~~~~~~--~p~~~~~p-~~tlp~~Iy~~~~~~~~  390 (425)
T Consensus       203 ~ALGAT~wetI~~v~lP~a~~GIv~a~~LglGRAlGETmAV~mv~Gn~p~~~~~~~~~~f~~~~~T~~~~Ia~~~g~a~~  282 (317)
T TIGR02138       203 LALGATKWETIRKVILPAARSGIVGAVVLGLGRALGETMAVAMVIGNAPSLNRPIPLNLFSPYGTTITSLIANEFGEASG  282 (317)
T ss_pred             HHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHCCHHHHHHHHHHHHHHHCCCCCC
T ss_conf             77068604335553320002189999999999999999999999724323444412022335689999999850666688


Q ss_pred             ---CHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
Q ss_conf             ---06999999999999999999999999999741
Q gi|254780705|r  391 ---PFVERTFGAILLLLIFLAVINTAMLWLRNRFK  422 (425)
Q Consensus       391 ---~~~~~~~aa~lvLl~~~~~~n~~a~~lr~r~~  422 (425)
T Consensus       283 g~~~~~~aL~~~glvLfvitl~~n~~~~~i~~~~~  317 (317)
T TIGR02138       283 GNSVHVSALFALGLVLFVITLLVNILARYIVRRRK  317 (317)
T ss_pred             CCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC
T ss_conf             84268999999999999999999999999853069