ERGIC2

Endoplasmic reticulum-Golgi intermediate compartment protein 2 (ERGIC2) [5] is a gene located on human chromosome 12p11. It encodes a protein of 377 amino acid residues. ERGIC2 protein is also known as PTX1, CDA14 or Erv41.

ERGIC2
Identifiers
AliasesERGIC2, Erv41, PTX1, cd002, CDA14, ERGIC and golgi 2
External IDsOMIM: 612236 MGI: 1914706 HomoloGene: 6574 GeneCards: ERGIC2
Gene location (Human)
Chr.Chromosome 12 (human)[1]
Band12p11.22Start29,337,352 bp[1]
End29,381,189 bp[1]
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

51290

67456

Ensembl

ENSG00000087502

ENSMUSG00000030304

UniProt

Q96RQ1

Q9CR89

RefSeq (mRNA)

NM_016570

NM_001286560
NM_026168
NM_026355

RefSeq (protein)

NP_057654

NP_001273489
NP_080444

Location (UCSC)Chr 12: 29.34 – 29.38 MbChr 6: 148.18 – 148.21 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

The biological function of ERGIC2 protein is unknown, although it was initially identified as a candidate tumor suppressor of prostate cancer,[6] and has been shown to induce cell growth arrest and senescence, to suppress colony formation in soft agar, and to decrease invasive potential of human prostate cancer cell line (PC-3 cells).[7] It is now believed to be a chaperon molecule involved in protein trafficking between the endoplasmic reticulum-Golgi intermediate compartment (ERGIC) and Golgi. The protein contains two hydrophobic transmembrane domains that help anchoring the molecule on the ER membrane, such that its large luminal domain orients inside the ER lumen and both the N- and C-termini are facing the cytosol. ERGIC2 forms a complex with two other proteins, ERGIC3 and ERGIC32, resulting in a shuttle for protein trafficking between ER and Golgi.[8] It has been shown to interact with a number of proteins, such as beta-amyloid,[9] protein elongation factor 1alpha,[10] and otoferlin.[11] Therefore, it may play an important role in cellular functions besides of being a component of a protein trafficking shuttle. More recently, a variant transcript of ERGIC2 has been reported.[12] It has a deletion of four bases at the junction of exons 8 and 9, resulting a frame-shift mutation after codon #189. The variant transcript encodes a truncated protein of 215 residues, which loses 45% of the luminal domain and the transmembrane domain near the C-terminus. This effectively abrogates its function as a protein transporter. A similar variant is also reported in armadillo. So this is not a random mutation. The function of this truncated protein is unknown.

References
  1. GRCh38: Ensembl release 89: ENSG00000087502 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000030304 - 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. "Entrez Gene: ERGIC2 ERGIC and golgi 2".
  6. Kwok SC, Liu X, Daskal I (2001). "Molecular cloning, expression, localization, and gene organization of PTX1, a human nuclear protein that is downregulated in prostate cancer". DNA Cell Biol. 20 (6): 349–57. doi:10.1089/10445490152122460. PMID 11445006.
  7. Liu X, Daskal I, Kwok SC (2003). "Effects of PTX1 expression on growth and tumorigenicity of the prostate cancer cell line PC-3". DNA Cell Biol. 22 (7): 469–74. doi:10.1089/104454903322247343. PMID 12932305.
  8. Breuza L, Halbeisen R, Jenö P, et al. (2004). "Proteomics of endoplasmic reticulum-Golgi intermediate compartment (ERGIC) membranes from brefeldin A-treated HepG2 cells identifies ERGIC-32, a new cycling protein that interacts with human Erv46". J. Biol. Chem. 279 (45): 47242–53. doi:10.1074/jbc.M406644200. PMID 15308636.
  9. Nelson TJ, Alkon DL (2007). "Protection against beta-amyloid-induced apoptosis by peptides interacting with beta-amyloid". J Biol Chem. 282 (43): 31238–49. doi:10.1074/jbc.M705558200. PMID 17761669.
  10. Yang YF, Chou MY, Fan CY, Chen SF, Lyu PC, Liu CC, Tseng TL (2008). "The possible interaction of CDA14 and protein elongation factor 1alpha". Biochim Biophys Acta. 1784 (2): 312–8. doi:10.1016/j.bbapap.2007.10.006. PMID 17980171.
  11. Zak M, Breß A, Brandt N, Franz C, Ruth P, Pfister M, Knipper M, Blin N (2012). "Ergic2, a brain specific interacting partner of otoferlin". Cell Physiol Biochem. 29 (5–6): 941–8. doi:10.1159/000188338. PMID 22613993.
  12. Kwok SC, Kumar S, Dai G (2014). "Characterization of a variant ERGIC2 transcript". DNA Cell Biol. 33 (2): 73–78. doi:10.1089/dna.2013.2225. PMID 24303950.

Further reading


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