Emerin is a protein that in humans is encoded by the EMD gene, also known as the STA gene. Emerin, together with LEMD3, is a LEM domain-containing integral protein of the inner nuclear membrane in vertebrates. Emerin is highly expressed in cardiac and skeletal muscle. In cardiac muscle, emerin localizes to adherens junctions within intercalated discs where it appears to function in mechanotransduction of cellular strain and in beta-catenin signaling. Mutations in emerin cause X-linked recessive Emery–Dreifuss muscular dystrophy, cardiac conduction abnormalities and dilated cardiomyopathy.
Quick Facts EMD, Available structures ...
Close
It is named after Alan Emery.[5]
Emerin is a 29.0 kDa (34 kDa observed MW) protein composed of 254 amino acids.[6] Emerin is a serine-rich protein with an N-terminal 20-amino acid hydrophobic region that is flanked by charged residues; the hydrophobic region may be important for anchoring the protein to the membrane, with the charged terminal tails being cytosolic.[7] In cardiac, skeletal, and smooth muscle, emerin localizes to the inner nuclear membrane;[8][9] expression of emerin is highest in skeletal and cardiac muscle.[7] In cardiac muscle specifically, emerin also resides at adherens junctions within intercalated discs.[10][11][12]
Emerin is a serine-rich nuclear membrane protein and a member of the nuclear lamina-associated protein family. It mediates membrane anchorage to the cytoskeleton. Emery–Dreifuss muscular dystrophy is an X-linked inherited degenerative myopathy resulting from mutation in the EMD (also known clinically as STA) gene.[13] Emerin appears to be involved in mechanotransduction, as emerin-deficient mouse fibroblasts failed to transduce normal mechanosensitive gene expression responses to strain stimuli.[14] In cardiac muscle, emerin is also found complexed to beta-catenin at adherens junctions of intercalated discs, and cardiomyocytes from hearts lacking emerin showed beta-catenin redistribution as well as perturbed intercalated disc architecture and myocyte shape. This interaction appears to be regulated by glycogen synthase kinase 3 beta.[15]
Mutations in emerin cause X-linked recessive Emery–Dreifuss muscular dystrophy, which is characterized by early contractures in the Achilles tendons, elbows and post-cervical muscles; muscle weakness proximal in the upper limbs and distal in lower limbs; along with cardiac conduction defects that range from sinus bradycardia, PR prolongation to complete heart block.[16] In these patients, immunostaining of emerin is lost in various tissues, including muscle, skin fibroblasts, and leukocytes, however diagnostic protocols involve mutational analysis rather than protein staining.[16] In nearly all cases, mutations result in a complete deletion, or undetectable levels, of emerin protein. Approximately 20% of cases have X chromosomes with an inversion within the Xq28 region.[17]
Moreover, recent research have found that the absence of functional emerin may decrease the infectivity of HIV-1. Thus, it is speculated that patients with Emery–Dreifuss muscular dystrophy may have immunity to or show an irregular infection pattern to HIV-1.[18]
Emerin has been shown to interact with:
- ACTA1,[19]
- ACTG2,[19]
- BANF1,[20][21]
- BCLAF1,[22]
- CTNNB1,[11][23]
- GMCL1,[21]
- LMNA,[19][24][25][26]
- PSME1,[24]
- SYNE1,[27][28][29]
- SYNE2,[27][29][30]
- TMEM43,[31] and
- YTHDC1.[24]
Bione S, Maestrini E, Rivella S, Mancini M, Regis S, Romeo G, Toniolo D (Dec 1994). "Identification of a novel X-linked gene responsible for Emery–Dreifuss muscular dystrophy". Nature Genetics. 8 (4): 323–7. doi:10.1038/ng1294-323. PMID 7894480. S2CID 7719215. Nagano A, Koga R, Ogawa M, Kurano Y, Kawada J, Okada R, Hayashi YK, Tsukahara T, Arahata K (Mar 1996). "Emerin deficiency at the nuclear membrane in patients with Emery–Dreifuss muscular dystrophy". Nature Genetics. 12 (3): 254–9. doi:10.1038/ng0396-254. PMID 8589715. S2CID 11030787. Cartegni L, di Barletta MR, Barresi R, Squarzoni S, Sabatelli P, Maraldi N, Mora M, Di Blasi C, Cornelio F, Merlini L, Villa A, Cobianchi F, Toniolo D (Dec 1997). "Heart-specific localization of emerin: new insights into Emery–Dreifuss muscular dystrophy". Human Molecular Genetics. 6 (13): 2257–64. doi:10.1093/hmg/6.13.2257. PMID 9361031. Lattanzi G, Cenni V, Marmiroli S, Capanni C, Mattioli E, Merlini L, Squarzoni S, Maraldi NM (Apr 2003). "Association of emerin with nuclear and cytoplasmic actin is regulated in differentiating myoblasts". Biochemical and Biophysical Research Communications. 303 (3): 764–70. doi:10.1016/s0006-291x(03)00415-7. PMID 12670476. Haraguchi T, Holaska JM, Yamane M, Koujin T, Hashiguchi N, Mori C, Wilson KL, Hiraoka Y (Mar 2004). "Emerin binding to Btf, a death-promoting transcriptional repressor, is disrupted by a missense mutation that causes Emery–Dreifuss muscular dystrophy". European Journal of Biochemistry. 271 (5): 1035–45. doi:10.1111/j.1432-1033.2004.04007.x. PMID 15009215. Markiewicz E, Tilgner K, Barker N, van de Wetering M, Clevers H, Dorobek M, Hausmanowa-Petrusewicz I, Ramaekers FC, Broers JL, Blankesteijn WM, Salpingidou G, Wilson RG, Ellis JA, Hutchison CJ (Jul 2006). "The inner nuclear membrane protein emerin regulates beta-catenin activity by restricting its accumulation in the nucleus". The EMBO Journal. 25 (14): 3275–85. doi:10.1038/sj.emboj.7601230. PMC 1523183. PMID 16858403. Clements L, Manilal S, Love DR, Morris GE (Jan 2000). "Direct interaction between emerin and lamin A". Biochemical and Biophysical Research Communications. 267 (3): 709–14. doi:10.1006/bbrc.1999.2023. PMID 10673356. Wheeler MA, Davies JD, Zhang Q, Emerson LJ, Hunt J, Shanahan CM, Ellis JA (Aug 2007). "Distinct functional domains in nesprin-1alpha and nesprin-2beta bind directly to emerin and both interactions are disrupted in X-linked Emery–Dreifuss muscular dystrophy". Experimental Cell Research. 313 (13): 2845–57. doi:10.1016/j.yexcr.2007.03.025. PMID 17462627.
- Gant TM, Wilson KL (1998). "Nuclear assembly". Annu. Rev. Cell Dev. Biol. 13: 669–95. doi:10.1146/annurev.cellbio.13.1.669. PMID 9442884.
- Helbling-Leclerc A, Bonne G, Schwartz K (2002). "Emery–Dreifuss muscular dystrophy". Eur. J. Hum. Genet. 10 (3): 157–61. doi:10.1038/sj.ejhg.5200744. PMID 11973618.
- Holaska JM, Wilson KL (2006). "Multiple roles for emerin: implications for Emery–Dreifuss muscular dystrophy". The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology. 288 (7): 676–80. doi:10.1002/ar.a.20334. PMC 2559942. PMID 16761279.
- Bione S, Tamanini F, Maestrini E, Tribioli C, Poustka A, Torri G, Rivella S, Toniolo D (1994). "Transcriptional organization of a 450-kb region of the human X chromosome in Xq28". Proc. Natl. Acad. Sci. U.S.A. 90 (23): 10977–81. doi:10.1073/pnas.90.23.10977. PMC 47904. PMID 8248200.
- Bione S, Small K, Aksmanovic VM, D'Urso M, Ciccodicola A, Merlini L, Morandi L, Kress W, Yates JR, Warren ST (1996). "Identification of new mutations in the Emery–Dreifuss muscular dystrophy gene and evidence for genetic heterogeneity of the disease". Hum. Mol. Genet. 4 (10): 1859–63. doi:10.1093/hmg/4.10.1859. PMID 8595407.
- Yamada T, Kobayashi T (1996). "A novel emerin mutation in a Japanese patient with Emery–Dreifuss muscular dystrophy". Hum. Genet. 97 (5): 693–4. doi:10.1007/BF02281886. PMID 8655156. S2CID 32857705.
- Chen EY, Zollo M, Mazzarella R, Ciccodicola A, Chen CN, Zuo L, Heiner C, Burough F, Repetto M, Schlessinger D, D'Urso M (1997). "Long-range sequence analysis in Xq28: thirteen known and six candidate genes in 219.4 kb of high GC DNA between the RCP/GCP and G6PD loci". Hum. Mol. Genet. 5 (5): 659–68. doi:10.1093/hmg/5.5.659. PMID 8733135.
- Ellis JA, Craxton M, Yates JR, Kendrick-Jones J (1998). "Aberrant intracellular targeting and cell cycle-dependent phosphorylation of emerin contribute to the Emery–Dreifuss muscular dystrophy phenotype". J. Cell Sci. 111 (6): 781–92. doi:10.1242/jcs.111.6.781. PMID 9472006.
- Squarzoni S, Sabatelli P, Ognibene A, Toniolo D, Cartegni L, Cobianchi F, Petrini S, Merlini L, Maraldi NM (1998). "Immunocytochemical detection of emerin within the nuclear matrix". Neuromuscul. Disord. 8 (5): 338–44. doi:10.1016/S0960-8966(98)00031-5. PMID 9673989. S2CID 6113119.
- Ellis JA, Yates JR, Kendrick-Jones J, Brown CA (1999). "Changes at P183 of emerin weaken its protein-protein interactions resulting in X-linked Emery–Dreifuss muscular dystrophy". Hum. Genet. 104 (3): 262–8. doi:10.1007/s004390050946. PMID 10323252. S2CID 26202307.
- Squarzoni S, Sabatelli P, Capanni C, Petrini S, Ognibene A, Toniolo D, Cobianchi F, Zauli G, Bassini A, Baracca A, Guarnieri C, Merlini L, Maraldi NM (2001). "Emerin presence in platelets". Acta Neuropathol. 100 (3): 291–8. doi:10.1007/s004019900169. PMID 10965799. S2CID 6097295.
- Martins SB, Eide T, Steen RL, Jahnsen T, Skålhegg BS, Collas P (2001). "HA95 is a protein of the chromatin and nuclear matrix regulating nuclear envelope dynamics". J. Cell Sci. 113 (21): 3703–13. doi:10.1242/jcs.113.21.3703. PMID 11034899.
- Hartley JL, Temple GF, Brasch MA (2001). "DNA Cloning Using In Vitro Site-Specific Recombination". Genome Res. 10 (11): 1788–95. doi:10.1101/gr.143000. PMC 310948. PMID 11076863.
- Laguri C, Gilquin B, Wolff N, Romi-Lebrun R, Courchay K, Callebaut I, Worman HJ, Zinn-Justin S (2001). "Structural characterization of the LEM motif common to three human inner nuclear membrane proteins". Structure. 9 (6): 503–11. doi:10.1016/S0969-2126(01)00611-6. PMID 11435115.
