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2.A.37.4.7
Cation C+/H+ antiporter 1 (Protein CATION/H+ EXCHANGER 1) (AtCHX1).  CHX transporters play roles in salt tolerance in A thaliana seedlings (Guo et al. 2023). They promote the uptake of K+, increase the ratio of K+/Na+, and promote the growth of plants under K+ deficiency and treatment with NaCl solutions. Thus, CHXs are involved in K+ transport and improve plant salt tolerance by coordinating K+ acquisition and homeostasis. (Guo et al. 2023).

Accession Number:Q9SA37
Protein Name:Cation/H(+) antiporter 1
Length:785
Molecular Weight:88909.00
Species:Arabidopsis thaliana (Mouse-ear cress) [3702]
Number of TMSs:14
Location1 / Topology2 / Orientation3: Membrane1 / Multi-pass membrane protein2
Substrate cation, potassium(1+), hydron

Cross database links:

Entrez Gene ID: 838208   
Pfam: PF00999   
KEGG: ath:AT1G16380   

Gene Ontology

GO:0016021 C:integral to membrane
GO:0015299 F:solute:hydrogen antiporter activity
GO:0006813 P:potassium ion transport

References (3)

[1] “Expression patterns of a novel AtCHX gene family highlight potential roles in osmotic adjustment and K+ homeostasis in pollen development.”  Sze H.et.al.   15347787
[2] “Sequence and analysis of chromosome 1 of the plant Arabidopsis thaliana.”  Theologis A.et.al.   11130712
[3] “Phylogenetic relationships within cation transporter families of Arabidopsis.”  Maeser P.et.al.   11500563

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MDPKMLFCLP EGDALFNPLN TMFIQMACIL VFSQFFYLFL KPCGQAGPVA QILAGIVLSL 
61:	LTIIRKVHEF FLQKDSASYY IFFSFLLRTA FVFLIGLEID LDFMKRNLKN SIVITLGSLV 
121:	ISGIIWLPFL WFLIRFMQIK GDFLTFYLAF LITLSNTAAP VVIRSIIDWK LHTSEIGRLA 
181:	ISCGLFIEIT NIFIYTIVLS FISGTMTADI FIYSFATGVI ILTNRFLASW LPKRNPKEKY 
241:	LSKAETLAFI ILILIIALTI ESSNLNSTLF VFIIGLMFPR EGKTYRTLIQ RLSYPIHEFV 
301:	LPVYFGYIGF RFSVNSLTKR HYLVLGMTVA LSLLGKLLGV LFACSFLKIP KQYWLFLSTM 
361:	LSVKGHIGLV LLDSNLMYKK WFTPVVHDMF VAALVIMTLL SGVITSLLLR SQEKSFAHIK 
421:	TSLELFDTTE ELRVLTCVYG VRHARGSISL VSALSGFSPG TSSSPFTPYL MHLIPLPKKR 
481:	KTELLYHELD EDAGNSNGGD DEFGTNEGLE INDSIDSFTR DRKIMVRQVK LVAPMENMHE 
541:	EICNATEDLR VSIVFLPFHK HQRIDGKTTN DGEVFRHMNR KVLKQAQCSI GIFVDRNITG 
601:	FHQLHGSDSV QHVAALFFGG PDDREALSLC KWLTNNSQIH LTVIQFVADD SKTEKIVGDA 
661:	VTKENNEVFL EIVSEDQTEN ETDRIFLEEF YHRFVTTGQV GFIEKRVSNG MQTLTILREI 
721:	GEMYSLFVVG KNRGDCPMTS GMNDWEECPE LGTVGDFLAS SNMDVNASVL VVQRHRNSFD 
781:	SFVDE