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1.A.1.10.9
The voltage-gated Na+ channel α-subunit, Nav1.9. It is present in excitable membranes and is resistant to tetrodotoxin and saxitoxin (Bosmans et al., 2011).  The mutation, S360Y, makes NaV1.9 channels sensitive to tetrodotoxin and saxitoxin, and the unusual slow open-state inactivation of NaV1.9 is mediated by the isoleucine-phenylalanine-methionine inactivation motif located in the linker connecting domains III and IV (Goral et al. 2015).  Gain-of function mutations can lead to heritable pain disorders, and painful small-fibre neuropathy (Han et al. 2016). It is a threshold channel that regulates action potential firing, and is preferentially expressed in myenteric neurons, the small-diameter dorsal root ganglion (DRG) and trigeminal ganglion neurons including nociceptors. There is a monogenic Mendelian link of Nav1.9 to human pain disorders including episodic pain due to a N816K mutation (Huang et al. 2019). .  

Accession Number:Q9UI33
Protein Name:Sodium channel protein type 11 subunit alpha
Length:1791
Molecular Weight:204922.00
Species:Homo sapiens (Human) [9606]
Number of TMSs:23
Location1 / Topology2 / Orientation3: Membrane1 / Multi-pass membrane protein2
Substrate Na+

Cross database links:

Entrez Gene ID: 11280   
Pfam: PF00520    PF06512   
KEGG: hsa:11280   

Gene Ontology

GO:0001518 C:voltage-gated sodium channel complex
GO:0005248 F:voltage-gated sodium channel activity
GO:0042493 P:response to drug

References (6)

[1] “Two tetrodotoxin-resistant sodium channels in human dorsal root ganglion neurons.”  Dib-Hajj S.D.et.al.   10580103
[2] “Identification of a novel human voltage-gated sodium channel alpha subunit gene, SCN12A.”  Jeong S.-Y.et.al.   10623608
[3] “Neurotrophin-evoked depolarization requires the sodium channel Nav1.9.”  Blum R.et.al.   12384689
[4] “The DNA sequence, annotation and analysis of human chromosome 3.”  Muzny D.M.et.al.   16641997
[5] “Expression of alternatively spliced sodium channel alpha-subunit genes: unique splicing patterns are observed in dorsal root ganglia.”  Raymond C.K.et.al.   15302875
[6] “Na+ channel Nav1.9: in search of a gating mechanism.”  Delmas P.et.al.   12536125

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MDDRCYPVIF PDERNFRPFT SDSLAAIEKR IAIQKEKKKS KDQTGEVPQP RPQLDLKASR 
61:	KLPKLYGDIP RELIGKPLED LDPFYRNHKT FMVLNRKRTI YRFSAKHALF IFGPFNSIRS 
121:	LAIRVSVHSL FSMFIIGTVI INCVFMATGP AKNSNSNNTD IAECVFTGIY IFEALIKILA 
181:	RGFILDEFSF LRDPWNWLDS IVIGIAIVSY IPGITIKLLP LRTFRVFRAL KAISVVSRLK 
241:	VIVGALLRSV KKLVNVIILT FFCLSIFALV GQQLFMGSLN LKCISRDCKN ISNPEAYDHC 
301:	FEKKENSPEF KMCGIWMGNS ACSIQYECKH TKINPDYNYT NFDNFGWSFL AMFRLMTQDS 
361:	WEKLYQQTLR TTGLYSVFFF IVVIFLGSFY LINLTLAVVT MAYEEQNKNV AAEIEAKEKM 
421:	FQEAQQLLKE EKEALVAMGI DRSSLTSLET SYFTPKKRKL FGNKKRKSFF LRESGKDQPP 
481:	GSDSDEDCQK KPQLLEQTKR LSQNLSLDHF DEHGDPLQRQ RALSAVSILT ITMKEQEKSQ 
541:	EPCLPCGENL ASKYLVWNCC PQWLCVKKVL RTVMTDPFTE LAITICIIIN TVFLAMEHHK 
601:	MEASFEKMLN IGNLVFTSIF IAEMCLKIIA LDPYHYFRRG WNIFDSIVAL LSFADVMNCV 
661:	LQKRSWPFLR SFRVLRVFKL AKSWPTLNTL IKIIGNSVGA LGSLTVVLVI VIFIFSVVGM 
721:	QLFGRSFNSQ KSPKLCNPTG PTVSCLRHWH MGDFWHSFLV VFRILCGEWI ENMWECMQEA 
781:	NASSSLCVIV FILITVIGKL VVLNLFIALL LNSFSNEERN GNLEGEARKT KVQLALDRFR 
841:	RAFCFVRHTL EHFCHKWCRK QNLPQQKEVA GGCAAQSKDI IPLVMEMKRG SETQEELGIL 
901:	TSVPKTLGVR HDWTWLAPLA EEEDDVEFSG EDNAQRITQP EPEQQAYELH QENKKPTSQR 
961:	VQSVEIDMFS EDEPHLTIQD PRKKSDVTSI LSECSTIDLQ DGFGWLPEMV PKKQPERCLP 
1021:	KGFGCCFPCC SVDKRKPPWV IWWNLRKTCY QIVKHSWFES FIIFVILLSS GALIFEDVHL 
1081:	ENQPKIQELL NCTDIIFTHI FILEMVLKWV AFGFGKYFTS AWCCLDFIIV IVSVTTLINL 
1141:	MELKSFRTLR ALRPLRALSQ FEGMKVVVNA LIGAIPAILN VLLVCLIFWL VFCILGVYFF 
1201:	SGKFGKCING TDSVINYTII TNKSQCESGN FSWINQKVNF DNVGNAYLAL LQVATFKGWM 
1261:	DIIYAAVDST EKEQQPEFES NSLGYIYFVV FIIFGSFFTL NLFIGVIIDN FNQQQKKLGG 
1321:	QDIFMTEEQK KYYNAMKKLG SKKPQKPIPR PLNKCQGLVF DIVTSQIFDI IIISLIILNM 
1381:	ISMMAESYNQ PKAMKSILDH LNWVFVVIFT LECLIKIFAL RQYYFTNGWN LFDCVVVLLS 
1441:	IVSTMISTLE NQEHIPFPPT LFRIVRLARI GRILRLVRAA RGIRTLLFAL MMSLPSLFNI 
1501:	GLLLFLIMFI YAILGMNWFS KVNPESGIDD IFNFKTFASS MLCLFQISTS AGWDSLLSPM 
1561:	LRSKESCNSS SENCHLPGIA TSYFVSYIII SFLIVVNMYI AVILENFNTA TEESEDPLGE 
1621:	DDFDIFYEVW EKFDPEATQF IKYSALSDFA DALPEPLRVA KPNKYQFLVM DLPMVSEDRL 
1681:	HCMDILFAFT ARVLGGSDGL DSMKAMMEEK FMEANPLKKL YEPIVTTTKR KEEERGAAII 
1741:	QKAFRKYMMK VTKGDQGDQN DLENGPHSPL QTLCNGDLSS FGVAKGKVHC D