Q9NRA2 (S17A5_HUMAN) Reviewed, UniProtKB/Swiss-Prot
Last modified
May 1, 2013.
Version 95.
History...
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Web links·Cross-refs·Entry info·DocumentsCustomize order
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Web links·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: Sialin Alternative name(s): H(+)/nitrate cotransporter H(+)/sialic acid cotransporter Short name=AST Membrane glycoprotein HP59 Solute carrier family 17 member 5 Vesicular H(+)/Aspartate-glutamate cotransporter | ||
| Gene names |
| ||
| Organism | Homo sapiens (Human) [Reference proteome] | ||
| Taxonomic identifier | 9606 [NCBI] | ||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo![]() |
Protein attributes
| Sequence length | 495 AA. |
| Sequence status | Complete. |
| Protein existence | Evidence at protein level |
General annotation (Comments)
| Function | Transports glucuronic acid and free sialic acid out of the lysosome after it is cleaved from sialoglycoconjugates undergoing degradation, this is required for normal CNS myelination. Mediates aspartate and glutamate membrane potential-dependent uptake into synaptic vesicles and synaptic-like microvesicles. Also functions as an electrogenic 2NO3-/H+ cotransporter in the plasma membrane of salivary gland acinar cells, mediating the physiological nitrate efflux, 25% of the circulating nitrate ions is typically removed and secreted in saliva. Ref.1 Ref.2 Ref.6 Ref.9 Ref.10 |
| Subcellular location | Cell membrane; Multi-pass membrane protein. Cytoplasmic vesicle › secretory vesicle › synaptic vesicle membrane. Lysosome membrane; Multi-pass membrane protein Ref.7 Ref.9 Ref.10. |
| Tissue specificity | Found in fetal lung and small intestine, and at lower level in fetal skin and muscle. In the adult, detected in placenta, kidney and pancreas. Abundant in the endothelial cells of tumors from ovary, colon, breast and lung, but is not detected in endothelial cells from the corresponding normal tissues. Ref.1 Ref.2 |
| Involvement in disease | Salla disease (SD) [MIM:604369]: Sialic acid storage disease (SASD). SASDs are autosomal recessive neurodegenerative disorders characterized by hypotonia, cerebellar ataxia and mental retardation. They are caused by a defect in the metabolism of sialic acid which results in increased urinary excretion of unconjugated sialic acid, specifically N-acetylneuraminic acid. Enlarged lysosomes are seen on electron microscopic studies. Clinical symptoms of SD present usually at age less than 1 year and progression is slow. Infantile sialic acid storage disorder (ISSD) [MIM:269920]: Severe form of sialic acid storage disease. Affected newborns exhibit visceromegaly, coarse features and failure to thrive immediately after birth. These patients have a shortened life span, usually less than 2 years. Infantile sialic acid storage disorder is associated with non-immune hydrops fetalis, a generalized edema of the fetus with fluid accumulation in the body cavities due to non-immune causes. Non-immune hydrops fetalis is not a diagnosis in itself but a symptom, a feature of many genetic disorders, and the end-stage of a wide variety of disorders. |
| Sequence similarities | Belongs to the major facilitator superfamily. Sodium/anion cotransporter family. |
| Sequence caution | The sequence AAF97769.1 differs from that shown. Reason: Erroneous initiation. |
Ontologies
Alternative products
| This entry describes 2 isoforms produced by alternative splicing. [Align] [Select] | ||||||
| Isoform 1 (identifier: Q9NRA2-1) This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform 2 (identifier: Q9NRA2-2) The sequence of this isoform differs from the canonical sequence as follows: 274-276: LSS → AGV 278-495: Missing. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chain | 1 – 495 | 495 | Sialin | PRO_0000220947 | |||||
Regions | |||||||||
| Topological domain | 1 – 41 | 41 | Cytoplasmic Potential | ||||||
| Transmembrane | 42 – 62 | 21 | Helical; Potential | ||||||
| Topological domain | 63 – 109 | 47 | Lumenal Potential | ||||||
| Transmembrane | 110 – 130 | 21 | Helical; Potential | ||||||
| Topological domain | 131 – 136 | 6 | Cytoplasmic Potential | ||||||
| Transmembrane | 137 – 157 | 21 | Helical; Potential | ||||||
| Topological domain | 158 | 1 | Lumenal Potential | ||||||
| Transmembrane | 159 – 179 | 21 | Helical; Potential | ||||||
| Topological domain | 180 – 200 | 21 | Cytoplasmic Potential | ||||||
| Transmembrane | 201 – 221 | 21 | Helical; Potential | ||||||
| Topological domain | 222 – 227 | 6 | Lumenal Potential | ||||||
| Transmembrane | 228 – 248 | 21 | Helical; Potential | ||||||
| Topological domain | 249 – 279 | 31 | Cytoplasmic Potential | ||||||
| Transmembrane | 280 – 300 | 21 | Helical; Potential | ||||||
| Topological domain | 301 – 328 | 28 | Lumenal Potential | ||||||
| Transmembrane | 329 – 349 | 21 | Helical; Potential | ||||||
| Topological domain | 350 – 365 | 16 | Cytoplasmic Potential | ||||||
| Transmembrane | 366 – 386 | 21 | Helical; Potential | ||||||
| Topological domain | 387 – 391 | 5 | Lumenal Potential | ||||||
| Transmembrane | 392 – 412 | 21 | Helical; Potential | ||||||
| Topological domain | 413 – 423 | 11 | Cytoplasmic Potential | ||||||
| Transmembrane | 424 – 444 | 21 | Helical; Potential | ||||||
| Topological domain | 445 – 457 | 13 | Lumenal Potential | ||||||
| Transmembrane | 458 – 478 | 21 | Helical; Potential | ||||||
| Topological domain | 479 – 495 | 17 | Cytoplasmic Potential | ||||||
| Motif | 22 – 23 | 2 | Dileucine internalization motif | ||||||
Amino acid modifications | |||||||||
| Glycosylation | 71 | 1 | N-linked (GlcNAc...) Potential | ||||||
| Glycosylation | 77 | 1 | N-linked (GlcNAc...) Potential | ||||||
| Glycosylation | 95 | 1 | N-linked (GlcNAc...) Potential | ||||||
Natural variations | |||||||||
| Alternative sequence | 274 – 276 | 3 | LSS → AGV in isoform 2. | VSP_010482 | |||||
| Alternative sequence | 278 – 495 | 218 | Missing in isoform 2. | VSP_010483 | |||||
| Natural variant | 39 | 1 | R → C in SD; completely devoid of aspartate and glutamate transport activity, but retains appreciable H(+)/sialic acid cotransport activity, frequent mutation in Finland. Ref.2 Ref.9 Ref.11 Ref.12 | VAR_018684 | |||||
| Natural variant | 136 | 1 | K → E in SD. Ref.11 | VAR_018685 | |||||
| Natural variant | 183 | 1 | H → R in ISSD. Ref.2 Ref.11 | VAR_018686 | |||||
| Natural variant | 268 – 272 | 5 | Missing in ISSD. | VAR_018687 | |||||
| Natural variant | 296 | 1 | V → I. Corresponds to variant rs16883930 [ dbSNP | Ensembl ]. | VAR_034746 | |||||
| Natural variant | 334 | 1 | P → R in ISSD. Ref.2 Ref.11 | VAR_018688 | |||||
| Natural variant | 371 | 1 | G → V in ISSD. Ref.11 | VAR_018689 | |||||
Experimental info | |||||||||
| Mutagenesis | 22 – 23 | 2 | LL → GG: Targeted to plasma membrane; sialic acid uptake strongly activated at acidic pH. Ref.6 | ||||||
| Mutagenesis | 179 | 1 | F → C: 15 fold increase in affinity for glucuronic acid. Ref.8 | ||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Identification of a novel membrane protein, HP59, with therapeutic potential as a target of tumor angiogenesis." Fu C., Bardhan S., Cetateanu N.D., Wamil B.D., Wang Y., Yan H.-P., Shi E., Carter C., Venkov C., Yakes F.M., Page D.L., Lloyd R.S., Mernaugh R.L., Hellerqvist C.G. Clin. Cancer Res. 7:4182-4194(2001) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), FUNCTION, TISSUE SPECIFICITY. |
| [2] | "A new gene, encoding an anion transporter, is mutated in sialic acid storage diseases." Verheijen F.W., Verbeek E., Aula N., Beerens C.E.M.T., Havelaar A.C., Joosse M., Peltonen L., Aula P., Galjaard H., Van der Spek P.J., Mancini G.M.S. Nat. Genet. 23:462-465(1999) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), FUNCTION, TISSUE SPECIFICITY, VARIANT SD CYS-39, VARIANTS ISSD 268-SER--ASN-272 DEL; ARG-183 AND ARG-334. |
| [3] | "Complete sequencing and characterization of 21,243 full-length human cDNAs." Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S. Sugano S.Nat. Genet. 36:40-45(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 2). |
| [4] | "The DNA sequence and analysis of human chromosome 6." Mungall A.J., Palmer S.A., Sims S.K., Edwards C.A., Ashurst J.L., Wilming L., Jones M.C., Horton R., Hunt S.E., Scott C.E., Gilbert J.G.R., Clamp M.E., Bethel G., Milne S., Ainscough R., Almeida J.P., Ambrose K.D., Andrews T.D. Beck S.Nature 425:805-811(2003) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [5] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 2). Tissue: Colon. |
| [6] | "Functional characterization of wild-type and mutant human sialin." Morin P., Sagne C., Gasnier B. EMBO J. 23:4560-4570(2004) [PubMed] [Europe PMC] [Abstract] Cited for: FUNCTION, DILEUCINE MOTIF, MUTAGENESIS OF 22-LEU--LEU-23. |
| [7] | "Integral and associated lysosomal membrane proteins." Schroeder B., Wrocklage C., Pan C., Jaeger R., Koesters B., Schaefer H., Elsaesser H.-P., Mann M., Hasilik A. Traffic 8:1676-1686(2007) [PubMed] [Europe PMC] [Abstract] Cited for: SUBCELLULAR LOCATION [LARGE SCALE ANALYSIS], MASS SPECTROMETRY. Tissue: Placenta. |
| [8] | "Structure-function studies of the SLC17 transporter sialin identify crucial residues and substrate-induced conformational changes." Courville P., Quick M., Reimer R.J. J. Biol. Chem. 285:19316-19323(2010) [PubMed] [Europe PMC] [Abstract] Cited for: TOPOLOGY, MUTAGENESIS OF PHE-179. |
| [9] | "Functional characterization of vesicular excitatory amino acid transport by human sialin." Miyaji T., Omote H., Moriyama Y. J. Neurochem. 119:1-5(2011) [PubMed] [Europe PMC] [Abstract] Cited for: FUNCTION, SUBCELLULAR LOCATION, VARIANT SD CYS-39. |
| [10] | "Sialin (SLC17A5) functions as a nitrate transporter in the plasma membrane." Qin L., Liu X., Sun Q., Fan Z., Xia D., Ding G., Ong H.L., Adams D., Gahl W.A., Zheng C., Qi S., Jin L., Zhang C., Gu L., He J., Deng D., Ambudkar I.S., Wang S. Proc. Natl. Acad. Sci. U.S.A. 109:13434-13439(2012) [PubMed] [Europe PMC] [Abstract] Cited for: FUNCTION, SUBCELLULAR LOCATION. |
| [11] | "The spectrum of SLC17A5-gene mutations resulting in free sialic acid-storage diseases indicates some genotype-phenotype correlation." Aula N., Salomaeki P., Timonen R., Verheijen F., Mancini G.M.S., Maensson J.-E., Aula P., Peltonen L. Am. J. Hum. Genet. 67:832-840(2000) [PubMed] [Europe PMC] [Abstract] Cited for: VARIANTS SD CYS-39 AND GLU-136, VARIANTS ISSD 268-SER--ASN-272 DEL; ARG-183; ARG-334 AND VAL-371. |
| [12] | "Sialic acid storage disease of the Salla phenotype in American monozygous twin female sibs." Martin R.A., Slaugh R., Natowicz M., Pearlman K., Orvisky E., Krasnewich D., Kleta R., Huizing M., Gahl W.A. Am. J. Med. Genet. A 120:23-27(2003) [PubMed] [Europe PMC] [Abstract] Cited for: VARIANT SD CYS-39. |
| + | Additional computationally mapped references. |
Web resources
Cross-references
Sequence databases | |
|---|---|
| EMBL GenBank DDBJ | AF244577 mRNA. Translation: AAF97769.1. Different initiation. AJ387747 mRNA. Translation: CAB62540.1. AK075320 mRNA. Translation: BAC11546.1. AL590428, AL121972 Genomic DNA. Translation: CAI15635.1. AL121972, AL590428 Genomic DNA. Translation: CAI20417.1. BC020961 mRNA. Translation: AAH20961.1. |
| IPI | IPI00395808. IPI00411564. |
| RefSeq | NP_036566.1. NM_012434.4. |
| UniGene | Hs.597422. |
3D structure databases | |
| ProteinModelPortal | Q9NRA2. |
| ModBase | Search... |
Protein-protein interaction databases | |
| IntAct | Q9NRA2. 1 interaction. |
| STRING | 9606.ENSP00000348019. |
Protein family/group databases | |
| TCDB | 2.A.1.14.10. major facilitator superfamily (MFS). |
PTM databases | |
| PhosphoSite | Q9NRA2. |
Polymorphism databases | |
| DMDM | 48428688. |
Proteomic databases | |
| PaxDb | Q9NRA2. |
| PRIDE | Q9NRA2. |
Protocols and materials databases | |
| DNASU | 26503. |
| StructuralBiologyKnowledgebase | Search... |
Genome annotation databases | |
| Ensembl | ENST00000355773; ENSP00000348019; ENSG00000119899. |
| GeneID | 26503. |
| KEGG | hsa:26503. |
| UCSC | uc003phn.4. human. |
Organism-specific databases | |
| CTD | 26503. |
| GeneCards | GC06M074359. |
| HGNC | HGNC:10933. SLC17A5. |
| HPA | HPA044479. |
| MIM | 269920. phenotype. 604322. gene. 604369. phenotype. |
| neXtProt | NX_Q9NRA2. |
| Orphanet | 834. Free sialic acid storage disease. |
| PharmGKB | PA35824. |
| GenAtlas | Search... |
Phylogenomic databases | |
| eggNOG | COG0477. |
| HOGENOM | HOG000230811. |
| HOVERGEN | HBG008834. |
| InParanoid | Q9NRA2. |
| KO | K12301. |
| OMA | SDYHGHR. |
| OrthoDB | EOG4640BQ. |
| PhylomeDB | Q9NRA2. |
Enzyme and pathway databases | |
| Reactome | REACT_15518. Transmembrane transport of small molecules. REACT_19419. Amino acid and oligopeptide SLC transporters. |
Gene expression databases | |
| ArrayExpress | Q9NRA2. |
| Bgee | Q9NRA2. |
| CleanEx | HS_SLC17A5. |
| Genevestigator | Q9NRA2. |
| GermOnline | ENSG00000119899. Homo sapiens. |
Family and domain databases | |
| InterPro | IPR011701. MFS. IPR020846. MFS_dom. IPR016196. MFS_dom_general_subst_transpt. [Graphical view] |
| Pfam | PF07690. MFS_1. 1 hit. [Graphical view] |
| SUPFAM | SSF103473. MFS_gen_substrate_transporter. 1 hit. |
| PROSITE | PS50850. MFS. 1 hit. [Graphical view] |
| ProtoNet | Search... |
Other | |
| GenomeRNAi | 26503. |
| NextBio | 48778. |
| SOURCE | Search... |
Entry information
| Entry name | S17A5_HUMAN | ||||||||
| Accession | Primary (citable) accession number: Q9NRA2 Secondary accession number(s): Q5SZ76, Q8NBR5, Q9UGH0 | ||||||||
| Entry history |
| ||||||||
| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation program | Chordata Protein Annotation Program | ||||||||
| Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. | ||||||||
Relevant documents
| Human chromosome 6 Human chromosome 6: entries, gene names and cross-references to MIM |
| Human entries with polymorphisms or disease mutations List of human entries with polymorphisms or disease mutations |
| Human polymorphisms and disease mutations Index of human polymorphisms and disease mutations |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| SIMILARITY comments Index of protein domains and families |

Clusters with
