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2.A.18.6.3
System N1, SNAT3 [glutamine/histidine/asparagine/alanine]:[Na+ + H+] sym/antiporter (1 aa + 2 Na+ cotransported against 1 H+ antiported out) (probable orthologue of mNAT). Li+ can substitute for Na+; system N1 can function bidirectionally. SNAT3 is a primarily a glutamine transporter required for amino acid homeostasis. Loss cannot be compensated, suggesting that this transporter is a major route of glutamine transport in the liver, brain, and kidney (Chan et al. 2015). Biallelic variants of SLC38A3 cause epileptic encephalopathy (Marafi et al. 2021). Biallelic variants of SLC38A3 cause epileptic encephalopathy (Marafi et al. 2022).

Accession Number:Q99624
Protein Name:SN1 aka G17
Length:504
Molecular Weight:55773.00
Species:Homo sapiens (Human) [9606]
Number of TMSs:11
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate sodium(1+), hydron, alanine, asparagine, glutamine, histidine

Cross database links:

RefSeq: NP_006832.1   
Entrez Gene ID: 10991   
Pfam: PF01490   
OMIM: 604437  gene
KEGG: hsa:10991    hsa:10991   

Gene Ontology

GO:0005887 C:integral to plasma membrane
GO:0015297 F:antiporter activity
GO:0015180 F:L-alanine transmembrane transporter activity
GO:0015182 F:L-asparagine transmembrane transporter acti...
GO:0015186 F:L-glutamine transmembrane transporter activity
GO:0005290 F:L-histidine transmembrane transporter activity
GO:0015293 F:symporter activity
GO:0006867 P:asparagine transport
GO:0006868 P:glutamine transport
GO:0015817 P:histidine transport
GO:0015808 P:L-alanine transport
GO:0006814 P:sodium ion transport
GO:0015182 F:L-asparagine transmembrane transporter activity
GO:0006811 P:ion transport

References (12)

[1] “Primary structure, genomic organization, and functional and electrogenic characteristics of human system N 1, a Na+- and H+-coupled glutamine transporter.”  Fei Y.-J.et.al.   10823827
[2] “Complete sequencing and characterization of 21,243 full-length human cDNAs.”  Ota T.et.al.   14702039
[3] “The full-ORF clone resource of the German cDNA consortium.”  Bechtel S.et.al.   17974005
[4] “The DNA sequence, annotation and analysis of human chromosome 3.”  Muzny D.M.et.al.   16641997
[5] “The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).”  The MGC Project Teamet.al.   15489334
[6] “The 630-kb lung cancer homozygous deletion region on human chromosome 3p21.3: identification and evaluation of the resident candidate tumor suppressor genes.”  Lerman M.I.et.al.   11085536
[7] “Primary structure, genomic organization, and functional and electrogenic characteristics of human system N 1, a Na+- and H+-coupled glutamine transporter.”  Fei Y.-J.et.al.   10823827
[8] “Complete sequencing and characterization of 21,243 full-length human cDNAs.”  Ota T.et.al.   14702039
[9] “The full-ORF clone resource of the German cDNA consortium.”  Bechtel S.et.al.   17974005
[10] “The DNA sequence, annotation and analysis of human chromosome 3.”  Muzny D.M.et.al.   16641997
[11] “The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).”  The MGC Project Teamet.al.   15489334
[12] “The 630-kb lung cancer homozygous deletion region on human chromosome 3p21.3: identification and evaluation of the resident candidate tumor suppressor genes.”  Lerman M.I.et.al.   11085536

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MEAPLQTEMV ELVPNGKHSE GLLPVITPMA GNQRVEDPAR SCMEGKSFLQ KSPSKEPHFT 
61:	DFEGKTSFGM SVFNLSNAIM GSGILGLAYA MANTGIILFL FLLTAVALLS SYSIHLLLKS 
121:	SGVVGIRAYE QLGYRAFGTP GKLAAALAIT LQNIGAMSSY LYIIKSELPL VIQTFLNLEE 
181:	KTSDWYMNGN YLVILVSVTI ILPLALMRQL GYLGYSSGFS LSCMVFFLIA VIYKKFHVPC 
241:	PLPPNFNNTT GNFSHVEIVK EKVQLQVEPE ASAFCTPSYF TLNSQTAYTI PIMAFAFVCH 
301:	PEVLPIYTEL KDPSKKKMQH ISNLSIAVMY IMYFLAALFG YLTFYNGVES ELLHTYSKVD 
361:	PFDVLILCVR VAVLTAVTLT VPIVLFPVRR AIQQMLFPNQ EFSWLRHVLI AVGLLTCINL 
421:	LVIFAPNILG IFGVIGATSA PFLIFIFPAI FYFRIMPTEK EPARSTPKIL ALCFAMLGFL 
481:	LMTMSLSFII IDWASGTSRH GGNH