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2koy, 20 NMR models ()
Gene: ATP7B, PWD, WC1, WND (Homo sapiens)
Activity: Copper-exporting ATPase, with EC number
Related: 2arf

Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml


Structure of the E1064A mutant of the N-domain of Wilson Disease Associated Protein

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:021398519

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.


[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]


[ATP7B_HUMAN] Involved in the export of copper out of the cells, such as the efflux of hepatic copper into the bile.

About this Structure

2koy is a 1 chain structure with sequence from Homo sapiens. Full experimental information is available from OCA.


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