Progesterone receptor membrane component 1 (abbreviated PGRMC1) is a protein which co-purifies with progesterone binding proteins in the liver and ovary.[5][6] In humans, the PGRMC1 protein is encoded by the PGRMC1 gene.[7]
PGRMC1 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Aliases | PGRMC1, HPR6.6, MPR, progesterone receptor membrane component 1, Dap1, IZA, 25-Dx | ||||||||||||||||||||||||||||||||||||||||||||||||||
External IDs | OMIM: 300435; MGI: 1858305; HomoloGene: 48457; GeneCards: PGRMC1; OMA:PGRMC1 - orthologs | ||||||||||||||||||||||||||||||||||||||||||||||||||
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The sole biochemical function of PGRMC1 is heme-binding.[8][9] PGRMC1 shares key structural motifs with cytochrome b5.[10] PGRMC1 binds and activates P450 proteins,[11][12][13] which are important in drug, hormone and lipid metabolism. PGRMC1 also binds to PAIR-BP1 (plasminogen activator inhibitor RNA-binding protein-1).[6] However, its expression outside of the reproductive tract and in males suggests multiple functions for the protein. These may include binding to Insig (insulin-induced gene),[14] which regulates cholesterol synthesis.[15]
Expression
editPGRMC1 is highly expressed in the liver and kidney in humans[7] with lower expression in the brain, lung, heart, skeletal muscle and pancreas.[7][16][17] In rodents, PGRMC1 is found in the liver, lung, kidney and brain.[16][17] PGRMC1 is over-expressed in breast tumors and in cancer cell lines from the colon, thyroid, ovary, lung, and cervix.[18][19] Microarray analyses have detected PGRMC1 expression in colon, lung and breast tumors.[20][21][22]
PGRMC1 expression is induced by the non-genotoxic carcinogen 2,3,7,8-tetrachlorodibenzo-p-dioxin in the rat liver,[17] but this induction is specific to males.[23] PGRMC1 is expressed in the ovary and corpus luteum, where its expression is induced by progesterone[24] and during pregnancy,[25] respectively. PGRMC1 is expressed in various regions of the brain (hypothalamic area, circumventricular organs, ependymal cells of the lateral ventricles, meninges),[16][26] including regions known to facilitate lordosis.[16]
Binding to heme and cytochrome P450s
editThe PGRMC1 yeast homologue, Dap1 (damage associated protein 1), binds heme[9][27] through a penta-coordinate mechanism.[9][28] Yeast cells lacking the DAP1 gene are sensitive to DNA damage,[29] and heme-binding is essential for damage resistance.[27] Dap1 is also required for a critical step in cholesterol synthesis in which the P450 protein Erg11/Cyp51 removes a methyl group from lanosterol.[11][27][29][30] Erg11/Cyp51 is the target of the azole antifungal drugs. As a result, yeast cells lacking the DAP1 gene are highly sensitive to antifungal drugs[11][27][29] This function is conserved between the unrelated fungi S. cerevisiae and S. pombe. Dap1 also regulates the metabolism of iron in yeast.[30]
In yeast and humans, PGRMC1 binds directly to P450 proteins, including CYP51A1, CYP3A4, CYP7A1 and CYP21A2.[11] PGRMC1 also activates Cyp21 when the two proteins are co-expressed,[12][13] indicating that PGRMC1 promotes progesterone turnover. Just as Dap1 is required for the action of Erg11 in the synthesis of ergosterol in yeast, PGRMC1 regulates the Cyp51-catalyzed demethylation step in human cholesterol synthesis.[11] Thus, PGRMC1 and its homologues bind and regulate P450 proteins, and it has been likened to “a helping hand for P450 proteins”.[31]
Roles in signaling and apoptosis
editThe yeast PGRMC1 homologue is required for resistance to damage.[29] PGRMC1 also promotes survival in human cancer cells after treatment with chemotherapy.[6][8] In contrast, PGRMC1 promotes cell death in cancer cells after oxidative damage.[32] PGRMC1 alters several known survival signaling proteins, including the Akt protein kinase and the cell death-associated protein IκB.[32] Progesterone inhibits apoptosis in immortalized granulosa cells, and this activity requires PGRMC1 and its binding partner, PAIR-BP1 (plasminogen activator inhibitor RNA-binding protein-1).[6] However, PAIR-BP1 is not a progesterone binding protein, and the component of the PGRMC1 complex that binds to progesterone is unknown.
PGRMC1 was originally thought to represent a progesterone receptor of some sort and to bind to progesterone, but subsequently thought has moved towards PGRMC1 acting as a downstream mediator of some other progesterone-binding protein.[33]
See also
editReferences
edit- ^ a b c GRCh38: Ensembl release 89: ENSG00000101856 – Ensembl, May 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000006373 – Ensembl, May 2017
- ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ Meyer C, Schmid R, Scriba PC, Wehling M (Aug 1996). "Purification and partial sequencing of high-affinity progesterone-binding site(s) from porcine liver membranes". European Journal of Biochemistry. 239 (3): 726–31. doi:10.1111/j.1432-1033.1996.0726u.x. PMID 8774719.
- ^ a b c d Peluso JJ, Romak J, Liu X (Feb 2008). "Progesterone receptor membrane component-1 (PGRMC1) is the mediator of progesterone's antiapoptotic action in spontaneously immortalized granulosa cells as revealed by PGRMC1 small interfering ribonucleic acid treatment and functional analysis of PGRMC1 mutations". Endocrinology. 149 (2): 534–43. doi:10.1210/en.2007-1050. PMC 2219306. PMID 17991724.
- ^ a b c Gerdes D, Wehling M, Leube B, Falkenstein E (Jul 1998). "Cloning and tissue expression of two putative steroid membrane receptors". Biological Chemistry. 379 (7): 907–11. doi:10.1515/bchm.1998.379.7.907. PMID 9705155.
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- ^ a b c Ghosh K, Thompson AM, Goldbeck RA, Shi X, Whitman S, Oh E, Zhiwu Z, Vulpe C, Holman TR (Dec 2005). "Spectroscopic and biochemical characterization of heme binding to yeast Dap1p and mouse PGRMC1p". Biochemistry. 44 (50): 16729–36. doi:10.1021/bi0511585. PMC 2577039. PMID 16342963.
- ^ Mifsud W, Bateman A (2002). "Membrane-bound progesterone receptors contain a cytochrome b5-like ligand-binding domain". Genome Biology. 3 (12): RESEARCH0068. doi:10.1186/gb-2002-3-12-research0068. PMC 151170. PMID 12537557.
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- ^ Yang T, Espenshade PJ, Wright ME, Yabe D, Gong Y, Aebersold R, Goldstein JL, Brown MS (Aug 2002). "Crucial step in cholesterol homeostasis: sterols promote binding of SCAP to INSIG-1, a membrane protein that facilitates retention of SREBPs in ER". Cell. 110 (4): 489–500. doi:10.1016/S0092-8674(02)00872-3. PMID 12202038.
- ^ a b c d Krebs CJ, Jarvis ED, Chan J, Lydon JP, Ogawa S, Pfaff DW (Nov 2000). "A membrane-associated progesterone-binding protein, 25-Dx, is regulated by progesterone in brain regions involved in female reproductive behaviors". Proceedings of the National Academy of Sciences of the United States of America. 97 (23): 12816–21. Bibcode:2000PNAS...9712816K. doi:10.1073/pnas.97.23.12816. PMC 18847. PMID 11070092.
- ^ a b c Selmin O, Lucier GW, Clark GC, Tritscher AM, Vanden Heuvel JP, Gastel JA, Walker NJ, Sutter TR, Bell DA (Dec 1996). "Isolation and characterization of a novel gene induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin in rat liver". Carcinogenesis. 17 (12): 2609–15. doi:10.1093/carcin/17.12.2609. PMID 9006096.
- ^ Crudden G, Loesel R, Craven RJ (2005). "Overexpression of the cytochrome p450 activator hpr6 (heme-1 domain protein/human progesterone receptor) in tumors". Tumour Biology. 26 (3): 142–6. doi:10.1159/000086485. PMID 15970648. S2CID 2555270.
- ^ Peluso JJ, Liu X, Saunders MM, Claffey KP, Phoenix K (May 2008). "Regulation of ovarian cancer cell viability and sensitivity to cisplatin by progesterone receptor membrane component-1". The Journal of Clinical Endocrinology and Metabolism. 93 (5): 1592–9. doi:10.1210/jc.2007-2771. PMID 18319313.
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