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2.A.36.7.6
Dimeric Salt-Overly-Sensitive 1 (SOS1) sodium:proton exchanger 7 (NHX7) (Núñez-Ramírez et al. 2012).  The salt stress-induced SALT-OVERLY-SENSITIVE (SOS) pathway in Arabidopsis thaliana involves the perception of a calcium signal by the SOS3 and SOS3-like CALCIUM-BINDING PROTEIN8 (SCaBP8; 5.b.1.1.8) calcium sensors, which then interact with and activate the SOS2 protein kinase (9.B.106.3.4), forming a complex at the plasma membrane that activates the SOS1 Na⁺/H⁺ exchanger (Lin et al. 2014).  The involvement of SOS1 in Na+ efflux in plant roots has been reviewed (Britto and Kronzucker 2015). SOS1 appears to encode a salinity-inducible plasma membrane Na+ /H+ antiporter (Song et al. 2012).  

Accession Number:Q9LKW9
Protein Name:Sodium/hydrogen exchanger 7
Length:1146
Molecular Weight:127188.00
Species:Arabidopsis thaliana (Mouse-ear cress) [3702]
Number of TMSs:11
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate Na+

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MTTVIDATMA YRFLEEATDS SSSSSSSKLE SSPVDAVLFV GMSLVLGIAS RHLLRGTRVP 
61:	YTVALLVIGI ALGSLEYGAK HNLGKIGHGI RIWNEIDPEL LLAVFLPALL FESSFSMEVH 
121:	QIKRCLGQMV LLAVPGVLIS TACLGSLVKV TFPYEWDWKT SLLLGGLLSA TDPVAVVALL 
181:	KELGASKKLS TIIEGESLMN DGTAIVVFQL FLKMAMGQNS DWSSIIKFLL KVALGAVGIG 
241:	LAFGIASVIW LKFIFNDTVI EITLTIAVSY FAYYTAQEWA GASGVLTVMT LGMFYAAFAR 
301:	TAFKGDSQKS LHHFWEMVAY IANTLIFILS GVVIAEGILD SDKIAYQGNS WRFLFLLYVY 
361:	IQLSRVVVVG VLYPLLCRFG YGLDWKESII LVWSGLRGAV ALALSLSVKQ SSGNSHISKE 
421:	TGTLFLFFTG GIVFLTLIVN GSTTQFVLRL LRMDILPAPK KRILEYTKYE MLNKALRAFQ 
481:	DLGDDEELGP ADWPTVESYI SSLKGSEGEL VHHPHNGSKI GSLDPKSLKD IRMRFLNGVQ 
541:	ATYWEMLDEG RISEVTANIL MQSVDEALDQ VSTTLCDWRG LKPHVNFPNY YNFLHSKVVP 
601:	RKLVTYFAVE RLESACYISA AFLRAHTIAR QQLYDFLGES NIGSIVINES EKEGEEAKKF 
661:	LEKVRSSFPQ VLRVVKTKQV TYSVLNHLLG YIENLEKVGL LEEKEIAHLH DAVQTGLKKL 
721:	LRNPPIVKLP KLSDMITSHP LSVALPPAFC EPLKHSKKEP MKLRGVTLYK EGSKPTGVWL 
781:	IFDGIVKWKS KILSNNHSLH PTFSHGSTLG LYEVLTGKPY LCDLITDSMV LCFFIDSEKI 
841:	LSLQSDSTID DFLWQESALV LLKLLRPQIF ESVAMQELRA LVSTESSKLT TYVTGESIEI 
901:	DCNSIGLLLE GFVKPVGIKE ELISSPAALS PSNGNQSFHN SSEASGIMRV SFSQQATQYI 
961:	VETRARAIIF NIGAFGADRT LHRRPSSLTP PRSSSSDQLQ RSFRKEHRGL MSWPENIYAK 
1021:	QQQEINKTTL SLSERAMQLS IFGSMVNVYR RSVSFGGIYN NKLQDNLLYK KLPLNPAQGL 
1081:	VSAKSESSIV TKKQLETRKH ACQLPLKGES STRQNTMVES SDEEDEDEGI VVRIDSPSKI 
1141:	VFRNDL