>TIGR00932 2a37 transporter, monovalent cation:proton antiporter-2 (CPA2) family; InterPro: IPR004771 Na^+/H^+ exchange proteins eject protons from cells, effectively eliminating excess acid from actively metabolising cells. Na^+/H^+ exchange activity is also crucial for the regulation of cell volume, and for the reabsorption of NaCl across renal, intestinal, and other epithelia. These antiports exchange Na^+ for H^+ in an electroneutral manner, and this activity is carried out by a family of Na^+/H^+ exchangers, or NHEs, which are known to be present in both prokaryotic and eukaryotic cells. In mammalian cells, Na^+/H^+ exchange activity is found in both the plasma membrane and inner mitochondrial membrane. To date, six mammalian isoforms have been identified (designated NHE1-NHE6) , . These exchangers are highly-regulated (glyco)phosphoproteins, which, based on their primary structure, appear to contain 10-12 membrane-spanning regions (M) at the N-terminus and a large cytoplasmic region at the C-terminus. The transmembrane regions M3-M12 share identity with other members of the family. The M6 and M7 regions are highly conserved. Thus, this is thought to be the region that is involved in the transport of sodium and hydrogen ions. The cytoplasmic region has little similarity throughout the family. There is some evidence that the exchangers may exist in the cell membrane as homodimers, but little is currently known about the mechanism of their antiport . The monovalent Cation:Proton antiporter-1 (CPA1) family is a large family of proteins derived from Gram-positive and Gram-negative bacteria, blue green bacteria, yeast, plants and animals. This family represent the K(+)/H(+) antiporter. ; GO: 0008324 cation transmembrane transporter activity, 0006812 cation transport, 0016021 integral to membrane.

Probab=96.26 E-value=0.078 Score=29.62 Aligned_cols=205 Identities=19% Similarity=0.277 Sum_probs=119.7 Q ss_pred CCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHH---HHHHH-HCCCCCCCCCEEEEE-- Q ss_conf 676999987679999999999999999864867899998999999877889999---99898-237980003504553-- Q gi|255764465|r 48 NLTLRDWVNDILMILYFFMIGLELKHELIHGELSSWTKRSLPLLGAIGGITFPA---CIYMI-INCHTEIYLKGWAIP-- 121 (382) Q Consensus 48 ~~~l~~wvNDgLMaiFFf~vGLEiKrE~~~GeLs~~r~a~lP~~AAlGGmi~Pa---liy~~-~n~~~~~~~~GWaIP-- 121 (382) T Consensus 56 siP~~~~laE~GV~lLmF~~GLE~d~~~----L~~~~k~~~~~--g~lq~~~~~GfG~ll~~~~~-----~~~g~~~~Ge 124 (314) T TIGR00932 56 SIPLVNHLAELGVILLMFLIGLELDLER----LKKLRKAAFGV--GVLQVLVSGGFGVLLGLLLG-----HLLGLALGGE 124 (314) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHCCHHH----HHHHHHHHHHH--HHHHHHHHHHHHHHHHHHHH-----HHHCCCCCCC T ss_conf 3558998988889999999887328899----99999999722--07764222678999999999-----9850357886 Q ss_pred -------CC---------CCHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCC--C------------CC Q ss_conf -------37---------737899999998427888999999999998754479988886417--7------------66 Q gi|255764465|r 122 -------TA---------TDIAFTLGILSWIGPNIPSSLKIFFTALTMIDDFSAIAIMAIFYT--Q------------SL 171 (382) Q Consensus 122 -------~A---------TDiAFalgvl~llg~rvp~~lrvFLlaLAIvDDlgaIlVIAifYs--~------------~i 171 (382) T Consensus 125 RHikfsv~a~~~G~~L~~~Stav~~~~L~E~~~~~~~~G~-~~l~~l~~~D~a~v~lL~l~~~l~~~~g~~~~~~~~~~~ 203 (314) T TIGR00932 125 RHIKFSVAAVVIGIILALSSTAVVVQVLKERNLLKTREGQ-TVLGILLFQDIAVVPLLALLPLLATGSGKETVSASTEHV 203 (314) T ss_pred CHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHH-HHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCHHHH T ss_conf 0257889999999999999999999998650533346789-999999999999999999999856887664536410457 Q ss_pred CHHHHHHHHHHHHHHH-HH------------HHCCCCCHHHHHHHHHHHH-----HHHHHCCCCHHHHHHHHHHHCCCCC Q ss_conf 6799999999999999-98------------6259861237899999999-----9997128656789888863176787 Q gi|255764465|r 172 NLFALQVAITLIFLLF-LL------------NRCGFTNLFIYGFLGFFLW-----HSIFKSGIHTTVFGVIMALLLPDIK 233 (382) Q Consensus 172 ~~~~L~~a~~~~~~l~-~l------------~~~~v~~~~~y~~~g~~lW-----~~~~~sGIHaTiAGV~l~~~iP~~~ 233 (382) T Consensus 204 ~~~~~~~~~~~~~~~~~l~g~~l~~~~~~~~~~~~~~~~Se~~t~~~L~~~~g~a~~~~~~Gls~alGAF~AGv~ls~s~ 283 (314) T TIGR00932 204 ALALLLLKVFLAFLLLVLLGRWLLRPVLRLTAEARLSKDSELFTAASLLLVLGSAYLADLLGLSMALGAFLAGVLLSESE 283 (314) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 79999999999999999999998489999998622899845899999999999999998874769999989878740015 Q ss_pred CCCCCCCCCHHHHHHHHHCCCCCHHHHHHHHHHHCCCCCC Q ss_conf 7789400003788763420443247879998851263246 Q gi|255764465|r 234 NYHSPSNRISFYLLGDGLKSWVMPLVLPAFVFVNTGLTIS 273 (382) Q Consensus 234 ~~~~~~~~~~~~~le~~l~p~v~~~IlPlFAfaNaGV~l~ 273 (382) T Consensus 284 --------~~~~~l~~~~~p~~yg~l~plF-F~svGm~~d 314 (314) T TIGR00932 284 --------YRKHELESDIEPIGYGLLLPLF-FISVGMSLD 314 (314) T ss_pred --------HHHHHHHHHHCCCCCCEEEEHH-HEEECCCCC T ss_conf --------5788999874011450010010-023245679

HHsearch alignment for GI: 255764465 and conserved domain: TIGR00932