| Structural highlights
Function
[PSD10_HUMAN] Acts as a chaperone during the assembly of the 26S proteasome, specifically of the PA700/19S regulatory complex (RC). In the initial step of the base subcomplex assembly is part of an intermediate PSMD10:PSMC4:PSMC5:PAAF1 module which probably assembles with a PSMD5:PSMC2:PSMC1:PSMD2 module. Independently of the proteasome, regulates EGF-induced AKT activation through inhibition of the RHOA/ROCK/PTEN pahway, leading to prolonged AKT activation. Plays an important role in RAS-induced tumorigenesis.[1] [2] [3] [4] [5] [6] [7] [8] Acts as an proto-oncoprotein by being involved in negative regulation of tumor suppressors RB1 and p53/TP53. Overexpression is leading to phosphorylation of RB1 and proteasomal degradation of RB1. Regulates CDK4-mediated phosphorylation of RB1 by competing with CDKN2A for binding with CDK4. Facilitates binding of MDM2 to p53/TP53 and the mono- and polyubiquitination of p53/TP53 by MDM2 suggesting a function in targeting the TP53:MDM2 complex to the 26S proteasome. Involved in p53-independent apoptosis. Involved in regulation of NF-kappa-B by retaining it in the cytoplasm. Binds to the NF-kappa-B component RELA and accelerates its XPO1/CRM1-mediated nuclear export.[9] [10] [11] [12] [13] [14] [15] [16]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Human gankyrin (226 residues, 24.4 kDa) is a liver oncoprotein that plays an important role in the development of human hepatocellular carcinomas. In this paper, its solution structure is reported, which is the largest ankyrin protein ever determined by NMR. The highly degenerate primary sequences of the seven ankyrin repeats presented a major challenge, which was overcome by combined use of TROSY experiments, perdeuterated samples, isotope-filtered NMR experiments, and residual dipolar couplings. The final structure was of high quality, with atomic rmsds for the backbone (N, C', and C(alpha)) and all heavy atoms (residues 4-224) of 0.69 +/- 0.09 and 1.04 +/- 0.09 A, respectively. Detailed analyses of NMR data suggested that the conserved TPLH motifs play important structural roles in stabilizing the repeating ankyrin scaffold. Gankyrin is conformationally more stable than the tumor suppressor p16(INK4A), possibly due to the structural roles of conserved residues evidenced by slowly exchanging backbone amides as well as hydrogen bonding networks involving labile side chain protons. Structural comparison with p16(INK4A) identified several residues of gankyrin that are potentially important for CDK4 binding, whereas observation of the thiol proton of C180 indicated a well-structured Rb-binding site in the helical region of the sixth ankyrin repeat. Interestingly, the CDK4-binding site and Rb-binding site located in N- and C-terminal regions, respectively, are separated by comparatively more stable ankyrin repeats and highly condensed positive surface charge. These results and analyses will shed light on the structural basis of the function of human gankyrin.
Solution structure of the human oncogenic protein gankyrin containing seven ankyrin repeats and analysis of its structure--function relationship.,Yuan C, Li J, Mahajan A, Poi MJ, Byeon IJ, Tsai MD Biochemistry. 2004 Sep 28;43(38):12152-61. PMID:15379554[17]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Higashitsuji H, Itoh K, Nagao T, Dawson S, Nonoguchi K, Kido T, Mayer RJ, Arii S, Fujita J. Reduced stability of retinoblastoma protein by gankyrin, an oncogenic ankyrin-repeat protein overexpressed in hepatomas. Nat Med. 2000 Jan;6(1):96-9. PMID:10613832 doi:http://dx.doi.org/10.1038/71600
- ↑ Li J, Tsai MD. Novel insights into the INK4-CDK4/6-Rb pathway: counter action of gankyrin against INK4 proteins regulates the CDK4-mediated phosphorylation of Rb. Biochemistry. 2002 Mar 26;41(12):3977-83. PMID:11900540
- ↑ Dawson S, Apcher S, Mee M, Higashitsuji H, Baker R, Uhle S, Dubiel W, Fujita J, Mayer RJ. Gankyrin is an ankyrin-repeat oncoprotein that interacts with CDK4 kinase and the S6 ATPase of the 26 S proteasome. J Biol Chem. 2002 Mar 29;277(13):10893-902. Epub 2002 Jan 4. PMID:11779854 doi:http://dx.doi.org/10.1074/jbc.M107313200
- ↑ Higashitsuji H, Higashitsuji H, Itoh K, Sakurai T, Nagao T, Sumitomo Y, Masuda T, Dawson S, Shimada Y, Mayer RJ, Fujita J. The oncoprotein gankyrin binds to MDM2/HDM2, enhancing ubiquitylation and degradation of p53. Cancer Cell. 2005 Jul;8(1):75-87. PMID:16023600 doi:http://dx.doi.org/10.1016/j.ccr.2005.06.006
- ↑ Chen Y, Li HH, Fu J, Wang XF, Ren YB, Dong LW, Tang SH, Liu SQ, Wu MC, Wang HY. Oncoprotein p28 GANK binds to RelA and retains NF-kappaB in the cytoplasm through nuclear export. Cell Res. 2007 Dec;17(12):1020-9. PMID:18040287 doi:http://dx.doi.org/10.1038/cr.2007.99
- ↑ Kaneko T, Hamazaki J, Iemura S, Sasaki K, Furuyama K, Natsume T, Tanaka K, Murata S. Assembly pathway of the Mammalian proteasome base subcomplex is mediated by multiple specific chaperones. Cell. 2009 May 29;137(5):914-25. doi: 10.1016/j.cell.2009.05.008. PMID:19490896 doi:http://dx.doi.org/10.1016/j.cell.2009.05.008
- ↑ Wang J, Wang XF, Zhang LG, Xie SY, Li ZL, Li YJ, Li HH, Jiao F. Involvement of the mitochondrial pathway in p53-independent apoptosis induced by p28GANK knockdown in Hep3B cells. Cytogenet Genome Res. 2009;125(2):87-97. doi: 10.1159/000227831. Epub 2009 Aug, 31. PMID:19729910 doi:http://dx.doi.org/10.1159/000227831
- ↑ Man JH, Liang B, Gu YX, Zhou T, Li AL, Li T, Jin BF, Bai B, Zhang HY, Zhang WN, Li WH, Gong WL, Li HY, Zhang XM. Gankyrin plays an essential role in Ras-induced tumorigenesis through regulation of the RhoA/ROCK pathway in mammalian cells. J Clin Invest. 2010 Aug;120(8):2829-41. doi: 10.1172/JCI42542. Epub 2010 Jul 12. PMID:20628200 doi:http://dx.doi.org/10.1172/JCI42542
- ↑ Higashitsuji H, Itoh K, Nagao T, Dawson S, Nonoguchi K, Kido T, Mayer RJ, Arii S, Fujita J. Reduced stability of retinoblastoma protein by gankyrin, an oncogenic ankyrin-repeat protein overexpressed in hepatomas. Nat Med. 2000 Jan;6(1):96-9. PMID:10613832 doi:http://dx.doi.org/10.1038/71600
- ↑ Li J, Tsai MD. Novel insights into the INK4-CDK4/6-Rb pathway: counter action of gankyrin against INK4 proteins regulates the CDK4-mediated phosphorylation of Rb. Biochemistry. 2002 Mar 26;41(12):3977-83. PMID:11900540
- ↑ Dawson S, Apcher S, Mee M, Higashitsuji H, Baker R, Uhle S, Dubiel W, Fujita J, Mayer RJ. Gankyrin is an ankyrin-repeat oncoprotein that interacts with CDK4 kinase and the S6 ATPase of the 26 S proteasome. J Biol Chem. 2002 Mar 29;277(13):10893-902. Epub 2002 Jan 4. PMID:11779854 doi:http://dx.doi.org/10.1074/jbc.M107313200
- ↑ Higashitsuji H, Higashitsuji H, Itoh K, Sakurai T, Nagao T, Sumitomo Y, Masuda T, Dawson S, Shimada Y, Mayer RJ, Fujita J. The oncoprotein gankyrin binds to MDM2/HDM2, enhancing ubiquitylation and degradation of p53. Cancer Cell. 2005 Jul;8(1):75-87. PMID:16023600 doi:http://dx.doi.org/10.1016/j.ccr.2005.06.006
- ↑ Chen Y, Li HH, Fu J, Wang XF, Ren YB, Dong LW, Tang SH, Liu SQ, Wu MC, Wang HY. Oncoprotein p28 GANK binds to RelA and retains NF-kappaB in the cytoplasm through nuclear export. Cell Res. 2007 Dec;17(12):1020-9. PMID:18040287 doi:http://dx.doi.org/10.1038/cr.2007.99
- ↑ Kaneko T, Hamazaki J, Iemura S, Sasaki K, Furuyama K, Natsume T, Tanaka K, Murata S. Assembly pathway of the Mammalian proteasome base subcomplex is mediated by multiple specific chaperones. Cell. 2009 May 29;137(5):914-25. doi: 10.1016/j.cell.2009.05.008. PMID:19490896 doi:http://dx.doi.org/10.1016/j.cell.2009.05.008
- ↑ Wang J, Wang XF, Zhang LG, Xie SY, Li ZL, Li YJ, Li HH, Jiao F. Involvement of the mitochondrial pathway in p53-independent apoptosis induced by p28GANK knockdown in Hep3B cells. Cytogenet Genome Res. 2009;125(2):87-97. doi: 10.1159/000227831. Epub 2009 Aug, 31. PMID:19729910 doi:http://dx.doi.org/10.1159/000227831
- ↑ Man JH, Liang B, Gu YX, Zhou T, Li AL, Li T, Jin BF, Bai B, Zhang HY, Zhang WN, Li WH, Gong WL, Li HY, Zhang XM. Gankyrin plays an essential role in Ras-induced tumorigenesis through regulation of the RhoA/ROCK pathway in mammalian cells. J Clin Invest. 2010 Aug;120(8):2829-41. doi: 10.1172/JCI42542. Epub 2010 Jul 12. PMID:20628200 doi:http://dx.doi.org/10.1172/JCI42542
- ↑ Yuan C, Li J, Mahajan A, Poi MJ, Byeon IJ, Tsai MD. Solution structure of the human oncogenic protein gankyrin containing seven ankyrin repeats and analysis of its structure--function relationship. Biochemistry. 2004 Sep 28;43(38):12152-61. PMID:15379554 doi:10.1021/bi049116o
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