SNAP47

Synaptosome-associated protein, 47 kDal (SNAP47) is a human protein encoded by the SNAP47 gene.[4][5][6] Other aliases of this gene are SVAP1, HEL170, ESFI5812, and HEL-S-290. SNAP47 is a synaptosome protein which is associated with the protein coding in multiple diseases, including non small cell lung cancer and schizophrenia. SNAP47 is a member of the SNAP protein family. SNAP proteins are t-snare proteins that are a component of SNARE complex. The SNARE complex mediates vesicle fusion by creating tight complex that brings vesicle and membrane together.[7] This protein causes ubiquitous expression in testis, ovary, and many other tissues[8]

See also: Synaptosome
SNAP47
Identifiers
AliasesSNAP47, C1orf142, HEL170, SNAP-47, SVAP1, ESFI5812, HEL-S-290, synaptosome associated protein 47kDa, synaptosome associated protein 47, uncharacterized LOC100130093
External IDsMGI: 1915076 HomoloGene: 14206 GeneCards: SNAP47
Orthologs
SpeciesHumanMouse
Entrez

116841

67826

Ensembl

ENSG00000143740

ENSMUSG00000009894

UniProt

Q5SQN1

Q8R570

RefSeq (mRNA)

n/a

NM_144521
NM_001356452
NM_001356454

RefSeq (protein)

NP_653104
NP_001343381
NP_001343383

Location (UCSC)n/aChr 11: 59.41 – 59.45 Mb
PubMed search[2][3]
Wikidata
View/Edit HumanView/Edit Mouse

Gene

The gene is located at 1q42.13, meaning on chromosome 1 on the long arm of the chromosome in region 42, sub region 13. There are a total of 13 exons and 12 introns. This gene spans 52,693 base pairs. It is encoded on the plus strand. The coordinates for this gene are 227728518-227781231. The gene is flanked by ZNF678 gene and PRSS38 gene on the chromosome while the same location on the minus strand JMJD4 gene.[8]

Protein

The most common isoform of SNAP47 is 419 amino acids long.[8] SNAP47 protein is a synaptosome associated protein. Its molecular weight has been found to be 47167 M.[8] SNARE complex (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) includes syntaxin proteins, VAMP proteins and SNAP proteins. SNARE proteins are generally known to be related to vesicle fusion - mediating exocytosis or neurotransmitter release.[9]

They have also been associated with BLOC-1 (biogenesis of lysosome-related organelles complex-1). Hippocampal neurons deficient in BLOC-1 suggest neurite outgrowth defects which when taken with association of SNARE leads to possible variants of genes encoding BLOC-1 - DTNBP1 - in Schizophrenia models.

C1orf142 model as proposed by I-Tasser. Image colored in rainbow from N to C terminus.

Secondary structure

The secondary structure of SNAP47 has some long alpha helices intermixed with beta sheet and random coils.[10] The alpha helix are placed at about amino acid 120-150 and amino acids 350-415. SNARE proteins are believed to form compact four-helix complex with membranes.[11] The two alpha helices found are consistent with this observation.[10]

Tertiary structure

I-TASSER assembled and then aligned possible SNAP47 tertiary sequence with 5VOX, a Yeast V-ATPase, and a Ufd2 complexed with ubiquitin-like domain Rad23.[12] The TM scores respectively were 0.917 and 0.584.

Regulation of gene expression

Promoter

SNAP47 carries 4 promoter regions that create different variants of transcription. These were identified using by Eldorado at Genomatix. Promoter B boosts transcript variant 2 - GXT_27753855.[13]

SNAP47 Promoters
Promoter Name Start End Length (bp) Transcript
A GXP_6728372 227727168 227728207 1040 GXT_27753854
B GXP_23558 227727518 227728746 1229 GXT_2743329, GXT_2743651, GXT_27753855, GXT_27753856, GXT_27753857, GXT_27753859, GXT_27753858, GXT_24484547, GXT_22776811, GXT_24484548
C GXP_23501 227733817 227735492 1676 GXT_2753839, GXT_27753860, GXT_27753861, GXT_2807628, GXT_27753862, GXT_27753863, GXT_27753864, GXT_23529849, GXT_26185912
D GXP_6728373 227734695 227735734 1040 GXT_27753865
E GXP_3183167 227735173 227736217 1045 GXT_26215912, GXT_24484549
F GXP_6021433 227746689 227748193 1505 GXT_27136253, GXT_27136254

Transcription factors

Transcription Factors that have been predicted to attach to the promoter for SNAP47 are SP1, TATAB, and CARF. SP1 or Stimulating protein 1 had a matrix similarity of 1.0 and is a ubiquitous zinc finger transcription factor and is on the minus strand. TATAB is a TATA binding protein factor with a similar matrix of 0.945. CARF is a calcium response element with a matrix similarity of 0.928. SNAP25 decreases Ca2+ responsiveness in GABAargic synapses.

Expression pattern

RNAseq data display SNAP47 to be highly expressed in the adrenal gland, fetal brain, adult brain and the heart.[8] The adrenal gland, hormone producer, was transcribed at 8 reads per kilobase per million (RPKM). The lungs transcription is relatively low transcription except in a 17-week-old fetus. The transcription of the 17-week-old fetus lung is above 2 RPKM. There is low transcription rate (below 2 RPKM) found in the fetal liver, trachea, pancreas and bone marrow. In the cell, SNAP47 localizes cytoplasm, the endoplasmic reticulum (ER), and Vesicular-tubular cluster (ERGIC).[14]

The protein abundance is about average when compared to all the other proteins in humans.[15] However, the mRNA has a higher than average abundance seen in this microarray. The mRNA is at or above the 75th percentile in the microarray for most of the tissues tested.[16] This may suggest that there is a larger expression rate but the protein is used up quickly for its function.

Post-transnational modification

SNAP47 had multiple possible post-translational modifications. High conserved phosphorylation sites were predicted at Y15, S129, S262, and S284 - none with specific kinases. Protein Kinase C plays a role in several signal transduction cascades including calcium release. They had had scores of 0.830, 0.747, and 0.812 at S82,S223, and S231 respectively.[17]

Palmitoylation sites are important in anchoring the SNARE complex to the cytosolic side of membranes. Since many SNAP proteins do not have trans-membrane domains, these are common way of attachment. The Palitic acid is covalently attaches to a cysteine residue. Two Palmitoylation sites were predicted at the beginning of SNAP47 protein at Cys6 and Cys12.

Propeptide cleavage site was predicted at R417[18] while an acetylation was predicted on S2.

Homology and evolution

Orthologs

As of June 2020, SNAP47 is conserved in 310 orthologs. C. lupus, a wolf/dog, has a 74.2% identity. M. mulatta, a monkey, was aligned with the Homo sapiens protein transcript and a 67.1% identical amino acids were found.[19] P. Marinus, a sea lamprey, is the most distant ortholog found at a 36.1% sequence identity. It was conserved in eukayotes but not bacteria or Archaea. A selected list of orthologs obtained are shown below.[8]

SNAP 47 Orthologs
Genus/species Common name Order Date of divergence (MYA) Accession number Seq. length (a.a.) Seq. identity (%) Seq. similarity (%)
Homo sapiens Human Primates 0 NP_001310859.1 419 100 100
Canis lupus Wolf Therapsid 29 XP_022282898.1 415 74.2 85.9
Rattus norvegicus Brown rat Rodentia 90 NP_955421.1 419 73.3 85.7
Mus musculus Mouse Rodentia 90 NP_001343381.1 67.1 81.1
Globicephala melas Long-finned whale Cetacea 96 XP_030700680.1 420 78.8 89.3
Pteropus vampyrus Large flying fox Chiroptera 96 XP_011370249.1 417 76.8 88.3
Loxodonta africana Elephant Proboscidea 105 XP_010599029.1 420 77.9 88.8
Echinops telfairi Hedgehogs Afrosoricida 105 XP_004696933.1 420 74.0 87.4
Gallus gallus Chicken Galliformes 312 XP_418505.4 419 59.8 79.4
Python bivittatus Burmese python Serpentes 312 XP_007439072.1 422 57.3 76.2
Nestor notabilis Kea Psittaciformes 312 XP_010008684.1 372 52.8 70.9
Xenopus tropicalis Western clawed frog Anura 352 XP_031759647.1 412 48.9 69.7
Latimeria chalumnae West Indian ocean coelacanth coelacanth 413 XP_014340899.1 418 53.9 74.2
Lepisosteus oculatus Spotted gar Lepisosteiformes 435 XP_015209714.1 425 53.4 72.6
Oryzias melastigma Indian medaka Beloniformes 435 XP_024129479.1 422 50.6 68.9
Denticeps clupeoides Herring Clupeiformes 435 XP_028833542.1 423 51.5 72.1
Danio rerio Zebrafish Cypriniformes 435 NP_001038902.1 419 48.9 70.2
Cyprinus carpio Carp fish Cypriniformes 435 XP_018975338.1 419 48.1 70.5
Sinocyclocheilus grahami Golden-line barbel Cypriniformes 435 XP_016139191.1 332 39.8 58.6
Amblyraja radiata Thorny skate Rajiformes 473 XP_032876175.1 421 49.5 68.7
Petromyzon marinus Sea lamprey Petromyzontiforme 615 XP_032802064.1 416 36.1 54.4

Paralogs

SNAP47 has 3 known paralogs - SNAP23, SNAP25, SNAP 29. The sequence similarity and identity is lower than 30% for all three. This suggest low relationship between different SNAP proteins. SNAP23 and SNAP25 were 55% identical suggesting the relationship between those two paralogs are higher. There is some evidence that if SNAP29 was incapacitated, SNAP47 would be able to take over function of vesicle fusion however, it would not be efficient or successful.[20]

Sequence identity of paralog protein structure compared to SNAP47
Paralogs Accession number Seq. Identity (%) Seq. Similarity (%) Gaps
SNAP29 NP_004773.1 15.7 26.6 48.5
SNAP23 NP_003816.2 14.4 24.1 51.4
SNAP25 NP_001309831.1 11.0 20.1 65.0

Function/biochemistry
Example of SNAP25 SNARE acrivity resulting in neurotransmitter release of Ca2+.

The paralogs, SNAP23 and SNAP25 are t-SNARE proteins, meaning it is present on the presynaptic plasma membrane that is being fused to (the target).[21] These proteins bind to syntaxin protein that attaches to the membrane. SNAP29, however, is binds to syntaxin on vesicles membranes rather than to plasma membranes. SNAP29 has also been found to be membrane bound with a large amount sticking into the cytoplasm.[21]

Interacting proteins

Many interacting proteins are related to vesicle-associated proteins.[22] Some important proteins that interact with the SNAP47 protein are vesicle-associated membrane protein (VAMP) and syntaxin (Stx) which are both used in the SNARE complex.[14] Various paralogs for VAMP and Stx were found as possible interactions. They were experimentally tested using anti-tag coimmunoprecipitation. VAMP4 and Stx-1A interact in the calcium dependent exocytosis. Golgin subfamily A member 2 protein (GOLGA2) is a protein used as a vesicle facilitating vesicle fusion with Golgi apparatus. A microarray as well as prey pooling approach were used to determine this interaction between GOLGA2 and SNAP47. A component of LINC (lincker of Nucleoskeleton and cytoskeleton) Complex is the KASH5 protein that was found to interact with SNAP47 by a two hybrid and prey pooling approach.

Clinical significance

Two viruses that interact are rep and PVR proteins which are replicase polyprotein 1ab and Poliovirus receptor respectively. Replicase polyprotein 1ab protein is in the human Sars coronavirus. Rep is involved in the transcription and replication of viral RNAs.[23] An alternative name is the ORF1ab polyprotein. It contains the polyprotein cleavage proteinases. The optimum pH for the proteinase activity is 7.0. Pp1ab is known to be cleaved in 15 different chains including (not limited to) Host translation inhibitor nsp1, 3C-like proteinase, and helicase.  Not much is known in how it interacts with SNAP47.

The poliovirus receptor plays a role in cell motility during tumor cell invasion and migration. PVR binds to CD96 and CD226 - Natural killer cell receptors. This can cause PVR to possibly be transferred to NK cells and cause fratricide of Natural killer cells which can increase metastasizing possibilities. Although the lung does not seem to have a large expression of this protein, it has been found that C1orf142 has larger expression rates in cell line of giant cell lung carcinoma they have high metastatic potential.[24] Cell line 95D (high metastatic potential) was studied along with 95C (low metastatic potential) and it is suggested that there is a possible link between SNAP47 protein and metastasis in lung cancers.

References
  1. GRCm38: Ensembl release 89: ENSMUSG00000009894 - Ensembl, May 2017
  2. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "SAPS < Sequence Statistics < EMBL-EBI". www.ebi.ac.uk. Retrieved 2020-07-28.
  5. "SNAP47 - Synaptosomal-associated protein 47 - Homo sapiens (Human) - SNAP47 gene & protein". www.uniprot.org. UniProt. Retrieved 2020-08-01.
  6. "SNAP47 synaptosome associated protein 47 [Homo sapiens (human)] - Gene - NCBI". www.ncbi.nlm.nih.gov. National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 2020-08-01.
  7. Rizo, Josep; Südhof, Thomas C. (August 2002). "Snares and Munc18 in synaptic vesicle fusion". Nature Reviews. Neuroscience. 3 (8): 641–653. doi:10.1038/nrn898. ISSN 1471-003X. PMID 12154365. S2CID 13351502.
  8. "SNAP47 synaptosome associated protein 47 [Homo sapiens (human)] - Gene - NCBI". www.ncbi.nlm.nih.gov. Retrieved 2020-06-10.
  9. "SNAP47 Gene - GeneCards | SNP47 Protein | SNP47 Antibody". www.genecards.org. Retrieved 2020-06-18.
  10. "Bioinformatics Toolkit". toolkit.tuebingen.mpg.de. Retrieved 2020-07-31.
  11. Holt, Matthew; Varoqueaux, Frédérique; Wiederhold, Katrin; Takamori, Shigeo; Urlaub, Henning; Fasshauer, Dirk; Jahn, Reinhard (2006-06-23). "Identification of SNAP-47, a Novel Qbc-SNARE with Ubiquitous Expression". Journal of Biological Chemistry. 281 (25): 17076–17083. doi:10.1074/jbc.M513838200. ISSN 0021-9258. PMID 16621800. S2CID 33998436.
  12. "I-TASSER results". zhanglab.ccmb.med.umich.edu. Retrieved 2020-08-01.
  13. Genomatix Software Suite (July 2020). "ElDorado". Genomatix.
  14. Kuster, Aurelia; Nola, Sebastien; Dingli, Florent; Vacca, Barbara; Gauchy, Christian; Beaujouan, Jean-Claude; Nunez, Marcela; Moncion, Thomas; Loew, Damarys; Formstecher, Etienne; Galli, Thierry (2015-11-20). "The Q-soluble N -Ethylmaleimide-sensitive Factor Attachment Protein Receptor (Q-SNARE) SNAP-47 Regulates Trafficking of Selected Vesicle-associated Membrane Proteins (VAMPs)". Journal of Biological Chemistry. 290 (47): 28056–28069. doi:10.1074/jbc.M115.666362. ISSN 0021-9258. PMC 4653666. PMID 26359495.
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  16. "GDS3113 / 194925". www.ncbi.nlm.nih.gov. Retrieved 2020-07-29.
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  18. "ProP 1.0 Server". www.cbs.dtu.dk. Retrieved 2020-07-29.
  19. "EMBOSS Needle < Pairwise Sequence Alignment < EMBL-EBI". www.ebi.ac.uk. Retrieved 2020-06-18.
  20. "SNAP29 Gene - GeneCards | SNP29 Protein | SNP29 Antibody". www.genecards.org. Retrieved 2020-07-29.
  21. Ramakrishnan, Neeliyath A.; Drescher, Marian J.; Drescher, Dennis G. (May 2012). "The SNARE complex in neuronal and sensory cells". Molecular and Cellular Neurosciences. 50 (1): 58–69. doi:10.1016/j.mcn.2012.03.009. ISSN 1044-7431. PMC 3570063. PMID 22498053.
  22. "IntAct Molecular Interaction". www.ebi.ac.uk.
  23. "P0C6X7- Replicase polyprotein 1ab". UniProt.
  24. Sun, Wenjing; Guo, Changlong; Meng, Xiangning; Yu, Yang; Jin, Yan; Tong, Dandan; Geng, Jingshu; Huang, Qi; Qi, Jiping; Liu, An; Guan, Rongwei (2012-04-01). "Differential Expression of PAI-RBP1, C1orf142, and COTL1 in Non–Small Cell Lung Cancer Cell Lines With Different Tumor Metastatic Potential". Journal of Investigative Medicine. 60 (4): 689–694. doi:10.2310/jim.0b013e31824963b6. ISSN 1081-5589. PMID 22373659. S2CID 45294541.
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