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Nucleoporin 210kDa


Nuclear pore complex
Nucleoporin 210kDa
Identifiers
Symbol	NUP210
Alt. Symbols	FLJ22389, GP210, KIAA0906, POM210
Entrez	23225
HUGO	30052
OMIM	607703
UniProt	Q8TEM1
Other data
Locus	Chr. 3 p25.1

Nuclear pore glycoprotein-210 (gp210) is an essential trafficking regulator in the eukaryotic nuclear pore complex. Gp-210 anchors the pore complex to the nuclear membrane.^[1] and protein tagging reveals its primarily located on the luminal side of double layer membrane at the pore. A single polypeptide motif of gp210 is responsible for sorting to nuclear membrane,^[2] and indicate the carboxyl tail of the protein is oriented toward the cytoplasmic side of the membrane.

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Disassembly and Assembly

During eukaryotic mitosis the nuclear envelope disentegrates into vesicles dispersing nuclear lamina proteins and nuclear pore complexes. Nup210 is specifically phosphorylated on the C-terminal (cytoplasmic) domain in mitosis at Ser1880^[3] and is dispersed through out the endoplasmic reticulum during mitosis as homodimers.^[4] Nuclear lamins begin to reassemble around chromosomes at the end of mitosis.^[5] Nup210 lags the reassembly process relative to other Nups.^[6] and while much of the assembly process can occur without it, the final assembly and dilation of the complexes require nup210.^[7] The replacement of serine at position 1880 with a phosphorylated 'looking' glutamate results in Nup120 complexes that fail to reassemble indicating that dephosphorylation of Nup120 within the final phases of proper assembly is required.^[8]

Pathology

Recognized by anti-nuclear antibodies found in primary biliary cirrhosis (PBC) anti-Nup210 antibodies correlate with progression toward end stage liver disease. Nup210 is possibly a destructive autoimmune target of the disease. One idea for the loss of tolerance is the increased or abnormal expression of Nup120 in patients with PBC.^[9]

anti-mitochondral, anti-centromere and anti-nup62 are also found in PBC.

References

^ Greber UF, Senior A, Gerace L (1990). "A major glycoprotein of the nuclear pore complex is a membrane-spanning polypeptide with a large lumenal domain and a small cytoplasmic tail". EMBO J. 9 (5): 1495-502. PMID 2184032.
^ Wozniak RW, Blobel G (1992). "The single transmembrane segment of gp210 is sufficient for sorting to the pore membrane domain of the nuclear envelope". J. Cell Biol. 119 (6): 1441-9. PMID 1281815.
^ Favreau C, Worman HJ, Wozniak RW, Frappier T, Courvalin JC (1996). "Cell cycle-dependent phosphorylation of nucleoporins and nuclear pore membrane protein Gp210". Biochemistry 35 (24): 8035-44. doi:10.1021/bi9600660. PMID 8672508.
^ Favreau C, Bastos R, Cartaud J, Courvalin JC, Mustonen P (2001). "Biochemical characterization of nuclear pore complex protein gp210 oligomers". Eur. J. Biochem. 268 (14): 3883-9. PMID 11453980.
^ Yang L, Guan T, Gerace L (1997). "Integral membrane proteins of the nuclear envelope are dispersed throughout the endoplasmic reticulum during mitosis". J. Cell Biol. 137 (6): 1199-210. PMID 9182656.
^ Bodoor K, Shaikh S, Salina D, et al (1999). "Sequential recruitment of NPC proteins to the nuclear periphery at the end of mitosis". J. Cell. Sci. 112 ( Pt 13): 2253-64. PMID 10362555.
^ Cohen M, Feinstein N, Wilson KL, Gruenbaum Y (2003). "Nuclear pore protein gp210 is essential for viability in HeLa cells and Caenorhabditis elegans". Mol. Biol. Cell 14 (10): 4230-7. doi:10.1091/mbc.E03-04-0260. PMID 14517331.
^ Onischenko EA, Crafoord E, Hallberg E (2007). "Phosphomimetic mutation of the mitotically phosphorylated serine 1880 compromises the interaction of the transmembrane nucleoporin gp210 with the nuclear pore complex". Exp. Cell Res. 313 (12): 2744-51. doi:10.1016/j.yexcr.2007.05.011. PMID 17559836.
^ Nakamura M, Takii Y, Ito M, et al (2006). "Increased expression of nuclear envelope gp210 antigen in small bile ducts in primary biliary cirrhosis". J. Autoimmun. 26 (2): 138-45. doi:10.1016/j.jaut.2005.10.007. PMID 16337775.

v • d • e Antigens: Autoantigens
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Categories: Autoantigens | Glycoproteins | Membrane proteins

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Nucleoporin_210kDa". A list of authors is available in Wikipedia.