Structure and interactions of the C-terminal metal binding domain of Archaeoglobus fulgidus CopA

Sorabh Agarwal, Deli Hong, Nirav K. Desai, Matthew H. Sazinsky, José M. Argüello, Amy C. Rosenzweig

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20 Scopus citations


The Cu+-ATPase CopA from Archaeoglobus fulgidus belongs to the P1B family of the P-type ATPases. These integral membrane proteins couple the energy of ATP hydrolysis to heavy metal ion translocation across membranes. A defining feature of P1B-1-type ATPases is the presence of soluble metal binding domains at the N-terminus (N-MBDs). The N-MBDs exhibit a conserved ferredoxin-like fold, similar to that of soluble copper chaperones, and bind metal ions via a conserved CXXC motif. The N-MBDs enable Cu+ regulation of turnover rates apparently through Cu-sensitive interactions with catalytic domains. A. fulgidus CopA is unusual in that it contains both an N-terminal MBD and a C-terminal MBD (C-MBD). The functional role of the unique C-MBD has not been established. Here, we report the crystal structure of the apo, oxidized C-MBD to 2.0 !Å resolution. In the structure, two C-MBD monomers form a domain-swapped dimer, which has not been observed previously for similar domains. In addition, the interaction of the C-MBD with the other cytoplasmic domains of CopA, the ATP binding domain (ATPBD) and actuator domain (A-domain), has been investigated. Interestingly, the C-MBD interacts specifically with both of these domains, independent of the presence of Cu + or nucleotides. These data reinforce the uniqueness of the C-MBD and suggest a distinct structural role for the C-MBD in CopA transport.

Original languageEnglish (US)
Pages (from-to)2450-2458
Number of pages9
JournalProteins: Structure, Function and Bioinformatics
Issue number11
StatePublished - Aug 15 2010


  • Copper chaperone
  • Copper trafficking
  • Crystal structure
  • Domain swap
  • Menkes syndrome
  • Wilson disease

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology


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