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Structural models of the human copper P-type ATPases ATP7A and ATP7B

Gourdon, Pontus LU ; Sitsel, Oleg; Lykkegaard Karlsen, Jesper; Birk Møller, Lisbeth and Nissen, Poul (2012) In Biological Chemistry 393(4). p.16-205
Abstract

The human copper exporters ATP7A and ATP7B contain domains common to all P-type ATPases as well as class-specific features such as six sequential heavy-metal binding domains (HMBD1-HMBD6) and a type-specific constellation of transmembrane helices. Despite the medical significance of ATP7A and ATP7B related to Menkes and Wilson diseases, respectively, structural information has only been available for isolated, soluble domains. Here we present homology models based on the existing structures of soluble domains and the recently determined structure of the homologous LpCopA from the bacterium Legionella pneumophila. The models and sequence analyses show that the domains and residues involved in the catalytic phosphorylation events and... (More)

The human copper exporters ATP7A and ATP7B contain domains common to all P-type ATPases as well as class-specific features such as six sequential heavy-metal binding domains (HMBD1-HMBD6) and a type-specific constellation of transmembrane helices. Despite the medical significance of ATP7A and ATP7B related to Menkes and Wilson diseases, respectively, structural information has only been available for isolated, soluble domains. Here we present homology models based on the existing structures of soluble domains and the recently determined structure of the homologous LpCopA from the bacterium Legionella pneumophila. The models and sequence analyses show that the domains and residues involved in the catalytic phosphorylation events and copper transfer are highly conserved. In addition, there are only minor differences in the core structures of the two human proteins and the bacterial template, allowing protein-specific properties to be addressed. Furthermore, the mapping of known disease-causing missense mutations indicates that among the heavy-metal binding domains, HMBD5 and HMBD6 are the most crucial for function, thus mimicking the single or dual HMBDs found in most copper-specific P-type ATPases. We propose a structural arrangement of the HMBDs and how they may interact with the core of the proteins to achieve autoinhibition.

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author
publishing date
type
Contribution to journal
publication status
published
keywords
Adenosine Triphosphatases, Amino Acid Sequence, Cation Transport Proteins, Copper, Humans, Legionella pneumophila, Models, Biological, Molecular Sequence Data, Phosphorylation, Protein Structure, Secondary, Sequence Homology, Amino Acid, Structural Homology, Protein, Journal Article
in
Biological Chemistry
volume
393
issue
4
pages
16 - 205
publisher
De Gruyter
external identifiers
  • scopus:84859832471
ISSN
1437-4315
language
English
LU publication?
no
id
b2648a80-37ef-45ce-b73e-e0208251ae3b
date added to LUP
2017-04-29 15:30:40
date last changed
2017-09-10 05:18:22
@article{b2648a80-37ef-45ce-b73e-e0208251ae3b,
  abstract     = {<p>The human copper exporters ATP7A and ATP7B contain domains common to all P-type ATPases as well as class-specific features such as six sequential heavy-metal binding domains (HMBD1-HMBD6) and a type-specific constellation of transmembrane helices. Despite the medical significance of ATP7A and ATP7B related to Menkes and Wilson diseases, respectively, structural information has only been available for isolated, soluble domains. Here we present homology models based on the existing structures of soluble domains and the recently determined structure of the homologous LpCopA from the bacterium Legionella pneumophila. The models and sequence analyses show that the domains and residues involved in the catalytic phosphorylation events and copper transfer are highly conserved. In addition, there are only minor differences in the core structures of the two human proteins and the bacterial template, allowing protein-specific properties to be addressed. Furthermore, the mapping of known disease-causing missense mutations indicates that among the heavy-metal binding domains, HMBD5 and HMBD6 are the most crucial for function, thus mimicking the single or dual HMBDs found in most copper-specific P-type ATPases. We propose a structural arrangement of the HMBDs and how they may interact with the core of the proteins to achieve autoinhibition.</p>},
  author       = {Gourdon, Pontus and Sitsel, Oleg and Lykkegaard Karlsen, Jesper and Birk Møller, Lisbeth and Nissen, Poul},
  issn         = {1437-4315},
  keyword      = {Adenosine Triphosphatases,Amino Acid Sequence,Cation Transport Proteins,Copper,Humans,Legionella pneumophila,Models, Biological,Molecular Sequence Data,Phosphorylation,Protein Structure, Secondary,Sequence Homology, Amino Acid,Structural Homology, Protein,Journal Article},
  language     = {eng},
  number       = {4},
  pages        = {16--205},
  publisher    = {De Gruyter},
  series       = {Biological Chemistry},
  title        = {Structural models of the human copper P-type ATPases ATP7A and ATP7B},
  volume       = {393},
  year         = {2012},
}