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PMEL
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1TVB, 1TVH, 3CC5, 4IS6, 5EU6, 5EU4, 5EU3
Identifiers
Aliases	PMEL, D12S53E, ME20, ME20-M, ME20M, P1, P100, PMEL17, SI, SIL, SILV, gp100, premelanosome protein, HMB-45, HMB45
External IDs	OMIM: 155550; MGI: 98301; HomoloGene: 5048; GeneCards: PMEL; OMA:PMEL - orthologs
Gene location (Human) Chr. Chromosome 12 (human) Band 12q13.2 Start 55,954,105 bp End 55,973,317 bp
Gene location (Mouse) Chr. Chromosome 10 (mouse) Band 10 D3|10 77.13 cM Start 128,540,064 bp End 128,556,107 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in retinal pigment epithelium skin of thigh vulva skin of abdomen testicle ectocervix human penis skin of arm nipple gonad Top expressed in iris hair follicle ciliary body epithelium of lens utricle conjunctival fornix spermatid cornea retinal pigment epithelium vestibular sensory epithelium More reference expression data BioGPS More reference expression data
Gene ontology Molecular function protein binding identical protein binding Cellular component multivesicular body membrane extracellular region multivesicular body membrane integral component of membrane endosome plasma membrane endoplasmic reticulum melanosome Golgi apparatus endoplasmic reticulum membrane integral component of plasma membrane Biological process melanin biosynthetic process melanosome organization developmental pigmentation Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 6490 20431 Ensembl ENSG00000185664 ENSMUSG00000025359 UniProt P40967 Q60696 Q9CZB2 RefSeq (mRNA) NM_001200053 NM_001200054 NM_006928 NM_001320121 NM_001320122 NM_001384361 NM_021882 RefSeq (protein) NP_001186982 NP_001186983 NP_001307050 NP_001307051 NP_008859 NP_068682 Location (UCSC) Chr 12: 55.95 – 55.97 Mb Chr 10: 128.54 – 128.56 Mb PubMed search
Wikidata
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Melanocyte protein PMEL also known as premelanosome protein (PMEL), silver locus protein homolog (SILV) or Glycoprotein 100 (gp100), is a protein that in humans is encoded by the PMEL gene. Its gene product may be referred to as PMEL, silver, ME20, gp100 or Pmel17.

Structure and function

PMEL is a 100 kDa, 661 amino acids long type I transmembrane glycoprotein that is expressed primarily in melanosomes, which are the melanin-producing organelles in melanocytes of pigment cells of the skin and eye, and in most malignant melanomas.

This protein is involved in melanosome maturation, including melanogenesis, melanosome biogenesis, and melanin polymerization (Eisenberg) . The transmembrane form of PMEL is modified in the secretory pathway by elaboration of N-linked oligosaccharides and addition and modification of O-linked oligosaccharides. It is then targeted to precursors of the pigment organelle, the melanosome, where it is proteolytically processed to several small fragments. Some of these fragments form non-pathological amyloid that assemble into sheets and form the striated pattern that underlies melanosomal ultrastructure. PMEL cleavage is mediated by several proteases including a proprotein convertase of the furin family, a "sheddase" that might include members of the a disintegrin and metalloproteinase (ADAM) family, and additional proteases in melanosomes or their precursors. After the amyloidogenic region is cleaved, the small remaining integral membrane fragment is digested by γ-secretase.

The expression of the PMEL gene is regulated by the microphthalmia-associated transcription factor (MITF).

Function in cancer and cancer treatment

The gp100 protein is a melanoma antigen i.e. a tumor-associated antigen.

Short fragments of it have been used to develop the gp100 cancer vaccine which is or contains gp100:209-217(210M).

Hydrophilic recombinant gp100 protein (HR-gp100) has been topically applied on human intact skin in vitro, and used as a vaccine in a mouse model. It was demonstrated that HR-gp100 permeates into human skin, and is processed and presented by human dendritic cells. In the mouse model, an HR-gp100-based vaccine triggered antigen-specific T cell responses, as shown by proliferation assays, ELISA and intracellular staining for IFN-γ.

The gp100 protein contains differentiation antigens., and has been widely studied to be used as a target for melanoma immunotherapy. Different sequences of the GP100 peptide could be used for immunization against tumors. According to a case study, modifications of GP100, such as GP100-209 and GP100-208, have shown a greater number of antigen-specific CTL's (cytotoxic T lymphocytes), which can target and kill cancer cells (Eisenberg).

References

1. ^ GRCh38: Ensembl release 89: ENSG00000185664 – Ensembl, May 2017
2. ^ GRCm38: Ensembl release 89: ENSMUSG00000025359 – Ensembl, May 2017
3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
5. Kim KK, Youn BS, Heng HH, Shi XM, Tsui LC, Lee ZH, Pickard RT, Kwon BS (Oct 1996). "Genomic organization and FISH mapping of human Pmel 17, the putative silver locus". Pigment Cell Res. 9 (1): 42–8. doi:10.1111/j.1600-0749.1996.tb00085.x. PMID 8739560.
6. "Entrez Gene: SILV silver homolog (mouse)".
7. Du J, Miller AJ, Widlund HR, Horstmann MA, Ramaswamy S, Fisher DE (2003). "MLANA/MART1 and SILV/PMEL17/GP100 are transcriptionally regulated by MITF in melanocytes and melanoma". Am. J. Pathol. 163 (1): 333–43. doi:10.1016/S0002-9440(10)63657-7. PMC 1868174. PMID 12819038.
8. Hoek KS, Schlegel NC, Eichhoff OM, Widmer DS, Praetorius C, Einarsson SO, Valgeirsdottir S, Bergsteinsdottir K, Schepsky A, Dummer R, Steingrimsson E (2008). "Novel MITF targets identified using a two-step DNA microarray strategy". Pigment Cell Melanoma Res. 21 (6): 665–76. doi:10.1111/j.1755-148X.2008.00505.x. PMID 19067971. S2CID 24698373.
9. "NCI Drug Dictionary". National Cancer Institute.

• Eisenberg, G; Machlenkin, A; Frankenburg, S; Mansura, A; Pitcovski, J; Yefenof, E; Peretz, T; Lotem, M.Sharett (2010). "Transcutaneous immunization with hydrophilic recombinant gp100 protein induces antigen-specific cellular immune response". Cell Immunol. 266 (1): 98–103. doi:10.1016/j.cellimm.2010.09.003. PMC 2976976. PMID 20947070.

Further reading

• Aplan PD, Lombardi DP, Kirsch IR (1991). "Structural characterization of SIL, a gene frequently disrupted in T-cell acute lymphoblastic leukemia". Mol. Cell. Biol. 11 (11): 5462–9. doi:10.1128/mcb.11.11.5462. PMC 361915. PMID 1922059.
• Kwon BS, Chintamaneni C, Kozak CA, et al. (1991). "A melanocyte-specific gene, Pmel 17, maps near the silver coat color locus on mouse chromosome 10 and is in a syntenic region on human chromosome 12". Proc. Natl. Acad. Sci. U.S.A. 88 (20): 9228–32. Bibcode:1991PNAS...88.9228K. doi:10.1073/pnas.88.20.9228. PMC 52687. PMID 1924386.
• Brown L, Cheng JT, Chen Q, et al. (1990). "Site-specific recombination of the tal-1 gene is a common occurrence in human T cell leukemia". EMBO J. 9 (10): 3343–51. doi:10.1002/j.1460-2075.1990.tb07535.x. PMC 552072. PMID 2209547.
• Guillaume van Niel; Ptissam Bergam; Aurelie Di Cicco; et al. (2015). "Apolipoprotein E Regulates Amyloid Formation within Endosomes of Pigment Cells". Cell Reports. 13 (1): 43–51. doi:10.1016/j.celrep.2015.08.057. PMID 26387950.
  • Adema GJ, de Boer AJ, Vogel AM, et al. (1994). "Molecular characterization of the melanocyte lineage-specific antigen gp100". J. Biol. Chem. 269 (31): 20126–33. doi:10.1016/S0021-9258(17)32136-1. hdl:2066/27146. PMID 7519602.
• Kawakami Y, Eliyahu S, Delgado CH, et al. (1994). "Identification of a human melanoma antigen recognized by tumor-infiltrating lymphocytes associated with in vivo tumor rejection". Proc. Natl. Acad. Sci. U.S.A. 91 (14): 6458–62. Bibcode:1994PNAS...91.6458K. doi:10.1073/pnas.91.14.6458. PMC 44221. PMID 8022805.
• Maresh GA, Marken JS, Neubauer M, et al. (1994). "Cloning and expression of the gene for the melanoma-associated ME20 antigen". DNA Cell Biol. 13 (2): 87–95. doi:10.1089/dna.1994.13.87. PMID 8179825.
• Bailin T, Lee ST, Spritz RA (1996). "Genomic organization and sequence of D12S53E (Pmel 17), the human homologue of the mouse silver (si) locus". J. Invest. Dermatol. 106 (1): 24–7. doi:10.1111/1523-1747.ep12326976. PMID 8592076.
• Chakraborty AK, Platt JT, Kim KK, et al. (1996). "Polymerization of 5,6-dihydroxyindole-2-carboxylic acid to melanin by the pmel 17/silver locus protein". Eur. J. Biochem. 236 (1): 180–8. doi:10.1111/j.1432-1033.1996.t01-1-00180.x. PMID 8617263.
• Chi DD, Merchant RE, Rand R, et al. (1997). "Molecular detection of tumor-associated antigens shared by human cutaneous melanomas and gliomas". Am. J. Pathol. 150 (6): 2143–52. PMC 1858329. PMID 9176405.
• Wagner SN, Wagner C, Schultewolter T, Goos M (1997). "Analysis of Pmel17/gp100 expression in primary human tissue specimens: implications for melanoma immuno- and gene-therapy". Cancer Immunol. Immunother. 44 (4): 239–47. doi:10.1007/s002620050379. PMC 11037831. PMID 9222283. S2CID 24294029.
• Curry BJ, Myers K, Hersey P (1998). "Polymerase chain reaction detection of melanoma cells in the circulation: relation to clinical stage, surgical treatment, and recurrence from melanoma". J. Clin. Oncol. 16 (5): 1760–9. doi:10.1200/JCO.1998.16.5.1760. PMID 9586889.
• Lupetti R, Pisarra P, Verrecchia A, et al. (1998). "Translation of a retained intron in tyrosinase-related protein (TRP) 2 mRNA generates a new cytotoxic T lymphocyte (CTL)-defined and shared human melanoma antigen not expressed in normal cells of the melanocytic lineage". J. Exp. Med. 188 (6): 1005–16. doi:10.1084/jem.188.6.1005. PMC 2212536. PMID 9743519.
• Lukowsky A, Bellmann B, Ringk A, et al. (1999). "Detection of melanoma micrometastases in the sentinel lymph node and in nonsentinel nodes by tyrosinase polymerase chain reaction". J. Invest. Dermatol. 113 (4): 554–9. doi:10.1046/j.1523-1747.1999.00719.x. PMID 10504440.
• Raposo G, Tenza D, Murphy DM, et al. (2001). "Distinct protein sorting and localization to premelanosomes, melanosomes, and lysosomes in pigmented melanocytic cells". J. Cell Biol. 152 (4): 809–24. doi:10.1083/jcb.152.4.809. PMC 2195785. PMID 11266471.
• Virador V, Matsunaga N, Matsunaga J, et al. (2002). "Production of melanocyte-specific antibodies to human melanosomal proteins: expression patterns in normal human skin and in cutaneous pigmented lesions". Pigment Cell Res. 14 (4): 289–97. doi:10.1034/j.1600-0749.2001.140410.x. PMID 11549113.
• Berson JF, Harper DC, Tenza D, et al. (2002). "Pmel17 initiates premelanosome morphogenesis within multivesicular bodies". Mol. Biol. Cell. 12 (11): 3451–64. doi:10.1091/mbc.12.11.3451. PMC 60267. PMID 11694580.
• Sensi M, Pellegatta S, Vegetti C, et al. (2003). "Identification of a novel gp100/pMel17 peptide presented by HLA-A*6801 and recognized on human melanoma by cytolytic T cell clones". Tissue Antigens. 59 (4): 273–9. doi:10.1034/j.1399-0039.2002.590404.x. PMID 12135425.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.

External links

• Overview of all the structural information available in the PDB for UniProt: P40967 (Melanocyte protein PMEL) at the PDBe-KB.

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