| Structural highlights
Disease
[ATP7B_HUMAN] Defects in ATP7B are the cause of Wilson disease (WD) [MIM:277900]. WD is an autosomal recessive disorder of copper metabolism in which copper cannot be incorporated into ceruloplasmin in liver, and cannot be excreted from the liver into the bile. Copper accumulates in the liver and subsequently in the brain and kidney. The disease is characterized by neurologic manifestations and signs of cirrhosis.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51]
Function
[ATP7B_HUMAN] Involved in the export of copper out of the cells, such as the efflux of hepatic copper into the bile.
Publication Abstract from PubMed
Wilson disease (WD) is a disorder of copper metabolism caused by mutations in the Cu-transporting ATPase ATP7B. WD is characterized by significant phenotypic variability, the molecular basis of which is poorly understood. The E1064A mutation in the N-domain of ATP7B was previously shown to disrupt ATP binding. We have now determined, by NMR, the structure of the N-domain containing this mutation and compared properties of E1064A and H1069Q, another mutant with impaired ATP binding. The E1064A mutation does not change the overall fold of the N-domain. However, the position of the alpha1,alpha2-helical hairpin (alpha-HH) that houses Glu(1064) and His(1069) is altered. The alpha-HH movement produces a more open structure compared with the wild-type ATP-bound form and misaligns ATP coordinating residues, thus explaining complete loss of ATP binding. In the cell, neither the stability nor targeting of ATP7B-E1064A to the trans-Golgi network differs significantly from the wild type. This is in a contrast to the H1069Q mutation within the same alpha-HH, which greatly destabilizes protein both in vitro and in cells. The difference between two mutants can be linked to a lower stability of the alpha-HH in the H1069Q variant at the physiological temperature. We conclude that the structural stability of the N-domain rather than the loss of ATP binding plays a defining role in the ability of ATP7B to reach the trans-Golgi network, thus contributing to phenotypic variability in WD.
Difference in stability of the N-domain underlies distinct intracellular properties of the E1064A and H1069Q mutants of copper-transporting ATPase ATP7B.,Dmitriev OY, Bhattacharjee A, Nokhrin S, Uhlemann EM, Lutsenko S J Biol Chem. 2011 May 6;286(18):16355-62. Epub 2011 Mar 11. PMID:21398519[52]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
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- ↑ Loudianos G, Dessi V, Lovicu M, Angius A, Altuntas B, Giacchino R, Marazzi M, Marcellini M, Sartorelli MR, Sturniolo GC, Kocak N, Yuce A, Akar N, Pirastu M, Cao A. Mutation analysis in patients of Mediterranean descent with Wilson disease: identification of 19 novel mutations. J Med Genet. 1999 Nov;36(11):833-6. PMID:10544227
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- ↑ Garcia-Villarreal L, Daniels S, Shaw SH, Cotton D, Galvin M, Geskes J, Bauer P, Sierra-Hernandez A, Buckler A, Tugores A. High prevalence of the very rare Wilson disease gene mutation Leu708Pro in the Island of Gran Canaria (Canary Islands, Spain): a genetic and clinical study. Hepatology. 2000 Dec;32(6):1329-36. PMID:11093740 doi:S0270-9139(00)72637-1
- ↑ Okada T, Shiono Y, Hayashi H, Satoh H, Sawada T, Suzuki A, Takeda Y, Yano M, Michitaka K, Onji M, Mabuchi H. Mutational analysis of ATP7B and genotype-phenotype correlation in Japanese with Wilson's disease. Hum Mutat. 2000;15(5):454-62. PMID:10790207 doi:<454::AID-HUMU7>3.0.CO;2-J 10.1002/(SICI)1098-1004(200005)15:5<454::AID-HUMU7>3.0.CO;2-J
- ↑ Kusuda Y, Hamaguchi K, Mori T, Shin R, Seike M, Sakata T. Novel mutations of the ATP7B gene in Japanese patients with Wilson disease. J Hum Genet. 2000;45(2):86-91. PMID:10721669 doi:10.1007/s100380050017
- ↑ Lee CC, Wu JY, Tsai FJ, Kodama H, Abe T, Yang CF, Tsai CH. Molecular analysis of Wilson disease in Taiwan: identification of one novel mutation and evidence of haplotype-mutation association. J Hum Genet. 2000;45(5):275-9. PMID:11043508 doi:10.1007/s100380070015
- ↑ Genschel J, Czlonkowska A, Sommer G, Buettner C, Bochow B, Lochs H, Schmidt H. Three novel mutations (P760L, L1305P, Q1351Stop) causing Wilson disease. Hum Mutat. 2001 Feb;17(2):156. PMID:11180609 doi:<156::AID-HUMU18>3.0.CO;2-0 10.1002/1098-1004(200102)17:2<156::AID-HUMU18>3.0.CO;2-0
- ↑ Caca K, Ferenci P, Kuhn HJ, Polli C, Willgerodt H, Kunath B, Hermann W, Mossner J, Berr F. High prevalence of the H1069Q mutation in East German patients with Wilson disease: rapid detection of mutations by limited sequencing and phenotype-genotype analysis. J Hepatol. 2001 Nov;35(5):575-81. PMID:11690702
- ↑ Butler P, McIntyre N, Mistry PK. Molecular diagnosis of Wilson disease. Mol Genet Metab. 2001 Mar;72(3):223-30. PMID:11243728 doi:10.1006/mgme.2000.3143
- ↑ Ohya K, Abo W, Tamaki H, Sugawara C, Endo T, Nomachi S, Fukushi M, Kinebuchi M, Matsuura A. Presymptomatic diagnosis of Wilson disease associated with a novel mutation of the ATP7B gene. Eur J Pediatr. 2002 Feb;161(2):124-6. PMID:11954751
- ↑ Yoo HW. Identification of novel mutations and the three most common mutations in the human ATP7B gene of Korean patients with Wilson disease. Genet Med. 2002 Nov-Dec;4(6 Suppl):43S-48S. PMID:12544487 doi:10.109700125817-200211001-00009
- ↑ Loudianos G, Lovicu M, Dessi V, Tzetis M, Kanavakis E, Zancan L, Zelante L, Galvez-Galvez C, Cao A. Abnormal mRNA splicing resulting from consensus sequence splicing mutations of ATP7B. Hum Mutat. 2002 Oct;20(4):260-6. PMID:12325021 doi:10.1002/humu.10121
- ↑ Takeshita Y, Shimizu N, Yamaguchi Y, Nakazono H, Saitou M, Fujikawa Y, Aoki T. Two families with Wilson disease in which siblings showed different phenotypes. J Hum Genet. 2002;47(10):543-7. PMID:12376745 doi:10.1007/s100380200082
- ↑ Gu YH, Kodama H, Du SL, Gu QJ, Sun HJ, Ushijima H. Mutation spectrum and polymorphisms in ATP7B identified on direct sequencing of all exons in Chinese Han and Hui ethnic patients with Wilson's disease. Clin Genet. 2003 Dec;64(6):479-84. PMID:14986826
- ↑ Majumdar R, Al-Jumah M, Zaidan R. A rare homozygous missense mutation in ATP7B exon 19 in a case of Wilson disease. Eur Neurol. 2004;51(1):52-4. Epub 2003 Nov 21. PMID:14639035 doi:10.1159/000075092
- ↑ Deguti MM, Genschel J, Cancado EL, Barbosa ER, Bochow B, Mucenic M, Porta G, Lochs H, Carrilho FJ, Schmidt HH. Wilson disease: novel mutations in the ATP7B gene and clinical correlation in Brazilian patients. Hum Mutat. 2004 Apr;23(4):398. PMID:15024742 doi:10.1002/humu.9227
- ↑ Pendlebury ST, Rothwell PM, Dalton A, Burton EA. Strokelike presentation of Wilson disease with homozygosity for a novel T766R mutation. Neurology. 2004 Nov 23;63(10):1982-3. PMID:15557537
- ↑ Liu XQ, Zhang YF, Liu TT, Hsiao KJ, Zhang JM, Gu XF, Bao KR, Yu LH, Wang MX. Correlation of ATP7B genotype with phenotype in Chinese patients with Wilson disease. World J Gastroenterol. 2004 Feb 15;10(4):590-3. PMID:14966923
- ↑ Dedoussis GV, Genschel J, Sialvera TE, Bochow B, Manolaki N, Manios Y, Tsafantakis E, Schmidt H. Wilson disease: high prevalence in a mountainous area of Crete. Ann Hum Genet. 2005 May;69(Pt 3):268-74. PMID:15845031 doi:10.1046/j.1529-8817.2005.00171.x
- ↑ Kumar S, Thapa BR, Kaur G, Prasad R. Identification and molecular characterization of 18 novel mutations in the ATP7B gene from Indian Wilson disease patients: genotype. Clin Genet. 2005 May;67(5):443-5. PMID:15811015 doi:10.1111/j.1399-0004.2005.00440.x
- ↑ Margarit E, Bach V, Gomez D, Bruguera M, Jara P, Queralt R, Ballesta F. Mutation analysis of Wilson disease in the Spanish population -- identification of a prevalent substitution and eight novel mutations in the ATP7B gene. Clin Genet. 2005 Jul;68(1):61-8. PMID:15952988 doi:CGE439
- ↑ Todorov T, Savov A, Jelev H, Panteleeva E, Konstantinova D, Krustev Z, Mihaylova V, Tournev I, Tankova L, Tzolova N, Kremensky I. Spectrum of mutations in the Wilson disease gene (ATP7B) in the Bulgarian population. Clin Genet. 2005 Nov;68(5):474-6. PMID:16207219 doi:10.1111/j.1399-0004.2005.00516.x
- ↑ Gromadzka G, Schmidt HH, Genschel J, Bochow B, Rodo M, Tarnacka B, Litwin T, Chabik G, Czlonkowska A. Frameshift and nonsense mutations in the gene for ATPase7B are associated with severe impairment of copper metabolism and with an early clinical manifestation of Wilson's disease. Clin Genet. 2005 Dec;68(6):524-32. PMID:16283883 doi:10.1111/j.1399-0004.2005.00528.x
- ↑ Cox DW, Prat L, Walshe JM, Heathcote J, Gaffney D. Twenty-four novel mutations in Wilson disease patients of predominantly European ancestry. Hum Mutat. 2005 Sep;26(3):280. PMID:16088907 doi:10.1002/humu.9358
- ↑ Vrabelova S, Letocha O, Borsky M, Kozak L. Mutation analysis of the ATP7B gene and genotype/phenotype correlation in 227 patients with Wilson disease. Mol Genet Metab. 2005 Sep-Oct;86(1-2):277-85. Epub 2005 Jun 20. PMID:15967699 doi:S1096-7192(05)00161-7
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- ↑ Davies LP, Macintyre G, Cox DW. New mutations in the Wilson disease gene, ATP7B: implications for molecular testing. Genet Test. 2008 Mar;12(1):139-45. doi: 10.1089/gte.2007.0072. PMID:18373411 doi:10.1089/gte.2007.0072
- ↑ Hsi G, Cullen LM, Macintyre G, Chen MM, Glerum DM, Cox DW. Sequence variation in the ATP-binding domain of the Wilson disease transporter, ATP7B, affects copper transport in a yeast model system. Hum Mutat. 2008 Apr;29(4):491-501. doi: 10.1002/humu.20674. PMID:18203200 doi:10.1002/humu.20674
- ↑ Abdel Ghaffar TY, Elsayed SM, Elnaghy S, Shadeed A, Elsobky ES, Schmidt H. Phenotypic and genetic characterization of a cohort of pediatric Wilson disease patients. BMC Pediatr. 2011 Jun 17;11:56. doi: 10.1186/1471-2431-11-56. PMID:21682854 doi:10.1186/1471-2431-11-56
- ↑ Dmitriev OY, Bhattacharjee A, Nokhrin S, Uhlemann EM, Lutsenko S. Difference in stability of the N-domain underlies distinct intracellular properties of the E1064A and H1069Q mutants of copper-transporting ATPase ATP7B. J Biol Chem. 2011 May 6;286(18):16355-62. Epub 2011 Mar 11. PMID:21398519 doi:https://dx.doi.org/10.1074/jbc.M110.198101
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