>TIGR01106 ATPase-IIC_X-K Na,H/K antiporter P-type ATPase, alpha subunit; InterPro: IPR005775 ATPases (or ATP synthases) are membrane-bound enzyme complexes/ion transporters that combine ATP synthesis and/or hydrolysis with the transport of protons across a membrane. ATPases can harness the energy from a proton gradient, using the flux of ions across the membrane via the ATPase proton channel to drive the synthesis of ATP. Some ATPases work in reverse, using the energy from the hydrolysis of ATP to create a proton gradient. There are different types of ATPases, which can differ in function (ATP synthesis and/or hydrolysis), structure (F-, V- and A-ATPases contain rotary motors) and in the type of ions they transport , . F-ATPases (F1F0-ATPases) in mitochondria, chloroplasts and bacterial plasma membranes are the prime producers of ATP, using the proton gradient generated by oxidative phosphorylation (mitochondria) or photosynthesis (chloroplasts). V-ATPases (V1V0-ATPases) are primarily found in eukaryotic vacuoles, catalysing ATP hydrolysis to transport solutes and lower pH in organelles. A-ATPases (A1A0-ATPases) are found in Archaea and function like F-ATPases. P-ATPases (E1E2-ATPases) are found in bacteria and in eukaryotic plasma membranes and organelles, and function to transport a variety of different ions across membranes. E-ATPases are cell-surface enzymes that hydrolyse a range of NTPs, including extracellular ATP. P-ATPases (sometime known as E1-E2 ATPases) (3.6.3.- from EC) are found in bacteria and in a number of eukaryotic plasma membranes and organelles . P-ATPases function to transport a variety of different compounds, including ions and phospholipids, across a membrane using ATP hydrolysis for energy. There are many different classes of P-ATPases, each of which transports a specific type of ion: H^+, Na^+, K^+, Mg^2+, Ca^2+, Ag^+ and Ag^2+, Zn^2+, Co^2+, Pb^2+, Ni^2+, Cd^2+, Cu^+ and Cu^2+. P-ATPases can be composed of one or two polypeptides, and can usually assume two main conformations called E1 and E2. This entry represents the alpha subunit found in the P-type cation exchange ATPases located in the plasma membranes of animal cells. These P-ATPases include both H^+/K^+-ATPases (3.6.3.10 from EC) and Na^+/K^+-ATPases (3.6.3.9 from EC), which belong to the IIC subfamily of ATPases , . These ATPases catalyse the hydrolysis of ATP coupled with the exchange of cations, pumping one cation out of the cell (H^+ or Na^+) in exchange for K^+. These ATPases contain an alpha subunit that is the catalytic component, and a regulatory beta subunit (IPR000402 from INTERPRO) that stabilizes the alpha/beta assembly . Different alpha and beta isoforms exist, permitting greater regulatory control. An example of a H^+/K^+-ATPase is the gastric pump responsible for acid secretion in the stomach, transporting protons from the cytoplasm of parietal cells to create a large pH gradient in exchange for the internalization of potassium ions, using ATP hydrolysis to drive the pump . More information about this protein can be found at Protein of the Month: ATP Synthases .; GO: 0005524 ATP binding, 0015077 monovalent inorganic cation transmembrane transporter activity, 0016820 hydrolase activity acting on acid anhydrides catalyzing transmembrane movement of substances, 0015672 monovalent inorganic cation transport, 0016021 integral to membrane.

Probab=99.65  E-value=6.7e-17  Score=122.19  Aligned_cols=161  Identities=19%  Similarity=0.206  Sum_probs=121.2

Q ss_pred             CCHHHHHHHHH-HHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHCCCEEEEEECCCHHHHHHHHHHHCCCH-------H
Q ss_conf             10012345568-764200456898874211345433899999984198699981672342232265508641-------3
Q gi|254780960|r  123 PFQDSLRERIS-LFKGTSTKIIDSLLEKKITYNPGGYELVHTMKQNGASTLLVTGGFSIFARFIAQHLGFDQ-------Y  194 (297)
Q Consensus       123 ~~~~~~~~~~~-~~~~~~~~~~~~~~~~~~~~~~~~~~~i~~l~~~g~~v~iisg~~~~~~~~ia~~lgi~~-------~  194 (297)
T Consensus       538 ~~P~~~~f~~~~~nf~~~~l~f~Gl~smidPPr~~vPdav~kCr~aGi~vimvtGdhPitakaia~~vGiis~~~e~~ed  617 (998)
T TIGR01106       538 QYPEGFKFDVDEVNFPTENLCFVGLLSMIDPPRAAVPDAVAKCRSAGIKVIMVTGDHPITAKAIAKSVGIISEGNETVED  617 (998)
T ss_pred             CCCCCCCCCHHHHCCCHHCCEEEEEEEECCCCCCCCHHHHHHHHHCCEEEEEEECCCCHHHHHHHHHCCEEECCCCHHHH
T ss_conf             37863220112211541000003311103886443304677552257079998179851477775112312257420788


Q ss_pred             HHHCCCC-----------------------HHHCCC--CCCCCCCCCHHHHHHHHHHHHHHHCCCCCEEEEEECCCCHHH
Q ss_conf             4310100-----------------------000000--001563105211388775323310377667999978923488
Q gi|254780960|r  195 YANRFIE-----------------------KDDRLT--GQVMEPIIDGTAKSQILLEAIQKLQINPEDTIAVGDGNNDLD  249 (297)
Q Consensus       195 ~a~~~~~-----------------------~~~~~~--~~~~~~~~~~~~k~~~~~~l~~~~~~~~~~v~avGDg~ND~p  249 (297)
T Consensus       618 ia~rl~~~~~~v~~~~a~a~v~~G~~l~d~~~~~l~~~l~~~~e~vfartsPqqkl~ive~Cqr~~a~vavtGdGvndsP  697 (998)
T TIGR01106       618 IAARLNIPVEQVNKRDAKACVVHGAELKDMSSEQLDEILKNHTEIVFARTSPQQKLIIVEGCQRQGAIVAVTGDGVNDSP  697 (998)
T ss_pred             HHHHHCCCHHHCCCCCCCEEEEECCHHCCCCHHHHHHHHHHCCCEEEEECCCCCEEEEEECCCCCCCEEEEECCCCCCCC
T ss_conf             99873023664021012121341511104788899999851241677514886117897324555537897258745660


Q ss_pred             HHHHCCCEEEEC--CCHHHHHHCCEEEECCCHHHHH
Q ss_conf             998489318987--9578998589899569832767
Q gi|254780960|r  250 MLRVAGYGVAFH--AKPALAKQAKIRIDHSDLEALL  283 (297)
Q Consensus       250 mL~~AgvGVA~~--a~~~v~~~Ad~~~~~~dl~~~l  283 (297)
T Consensus       698 alkkadiG~amGiaGsd~~k~aadm~llddnfasiv  733 (998)
T TIGR01106       698 ALKKADIGVAMGIAGSDVSKQAADMILLDDNFASIV  733 (998)
T ss_pred             HHHHCCCCEEECCCCCHHHHHHHCEEEECCCCEEEE
T ss_conf             011112303430131123332211433304520001