>TIGR02211 LolD_lipo_ex lipoprotein releasing system, ATP-binding protein; InterPro: IPR011924 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 LolD, a member of the ABC transporter family. LolD is involved in localization of lipoproteins in some bacteria. It works with a transmembrane protein LolC, which in some species is a paralogous pair LolC and LolE. Depending on the residue immediately following the modified N-terminal Cys residue, the nascent lipoprotein may be carried further by LolA and LolB to the outer membrane, or remain at the inner membrane. Excluded from this entry are homologs from the archaeal genus Methanosarcina .; GO: 0005524 ATP binding, 0006810 transport, 0016020 membrane.

Probab=96.07  E-value=0.088  Score=33.02  Aligned_cols=140  Identities=21%  Similarity=0.352  Sum_probs=66.7

Q ss_pred             HCCCCEEEEECCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCEEEEEECCCCHHHHHHHHHHHHHHHCCCCCCC
Q ss_conf             16772677621310027699999999998510111233333212479758999585217999878999987410110001
Q gi|254780332|r  216 LQRSDLIIIAGRPGMGKTSLATNIAYNVADAYKAELQTDGSYKTINGGIVGFYSLEMSSEQLATRIISEQTEVPSSKIRR  295 (504)
Q Consensus       216 l~~G~l~Viaarpg~GKTalalniA~~~A~~~~~~~~~~~~~~~~~g~~Vl~fSlEMs~~el~~R~is~~s~I~~~~i~~  295 (504)
T Consensus        28 i~~GE~~~IvG~SGSGKSTLL-HlLGGL--------------D~PT~G~v~f~G~~l~~----------lS~~~~~~LRN   82 (221)
T TIGR02211        28 IGKGEIVAIVGSSGSGKSTLL-HLLGGL--------------DNPTSGEVLFNGQSLSK----------LSSNERAKLRN   82 (221)
T ss_pred             EECCCEEEEECCCCCCHHHHH-HHHHCC--------------CCCCCCEEEECCCCHHH----------CCHHHHHHHHH
T ss_conf             306633798736787168999-987306--------------89963158970632344----------04467887512


Q ss_pred             CCC----------------------------CHHHHHHHHHHHHHHHHCCE--EEECCCC-CCH--HHHHHHHHHHCCCC
Q ss_conf             213----------------------------76889989999999862780--7825899-889--99999886402244
Q gi|254780332|r  296 GEL----------------------------TRPDYEKIVACSQVMQKLPL--YIDQTGG-ISM--SQLATRARRLKRQR  342 (504)
Q Consensus       296 g~l----------------------------~~~e~~~i~~a~~~l~~~~l--~I~d~~~-~ti--~~I~~~~r~~~~~~  342 (504)
T Consensus        83 ~~LGFiYQFHHLL~dFtaLENVaMP~LIg~~s~~--ea~~~A~~mL~~VgL~~R~~h~PSELSGGERQRvAIARALv--N  158 (221)
T TIGR02211        83 KKLGFIYQFHHLLPDFTALENVAMPLLIGKKSKK--EAKERAYEMLEKVGLEHRINHRPSELSGGERQRVAIARALV--N  158 (221)
T ss_pred             HHCCCEEEHHHCCCCCCHHHHHHHHHHHCCCCHH--HHHHHHHHHHHHHCCCCCCCCCCCCCCCCHHHHHHHHHHHH--C
T ss_conf             2258444320203000026887777753589988--99999999988607334455577734563379999999861--8


Q ss_pred             CCCEEEECCHHHCCCCCCCCCHHHHHHHHHHHHHHHHHHHHCCCEEEEEE
Q ss_conf             47467767135325664432113788999999999999882791999771
Q gi|254780332|r  343 GLDLLIVDYIQLMTTSKKIEENRVLEITGITMALKALAKELNIPIIALSQ  392 (504)
Q Consensus       343 gi~~vvIDYLqli~~~~~~~~~r~~~i~~is~~lK~lA~e~~ipvi~lsQ  392 (504)
T Consensus       159 ~P~lvlAD-----EPTGNLD~~~a~~iF~---L~~eLN~~~~TsflvVTH  200 (221)
T TIGR02211       159 QPSLVLAD-----EPTGNLDNNNAKSIFE---LMLELNRELNTSFLVVTH  200 (221)
T ss_pred             CCCEEECC-----CCCCHHHHHHHHHHHH---HHHHHHHHCCCEEEEEEC
T ss_conf             97658612-----9885323777999999---999988653916999834