Regulation of the cardiac Na+ pump by palmitoylation of its catalytic and regulatory subunits

Jacqueline Howie, Lindsay B. Tulloch, Michael J. Shattock, William Fuller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The Na+/K+-ATPase (Na+ pump) is the principal consumer of ATP in multicellular organisms. In the heart, the Na+ gradient established by the pump is essential for all aspects of cardiac function, and appropriate regulation of the cardiac Na+ pump is therefore crucial to match cardiac output to the physiological requirements of an organism. The cardiac pump is a multi-subunit enzyme, consisting of a catalytic alpha-subunit and regulatory beta- and FXYD subunits. All three subunits may become palmitoylated, although the functional outcome of these palmitoylation events is incompletely characterized to date. Interestingly, both beta- and FXYD subunits may be palmitoylated or glutathionylated at the same cysteine residues. These competing chemically distinct post-translational modifications may mediate functionally different effects on the cardiac pump. In the present article, we review the cellular events that control the balance between these modifications, and discuss the likely functional effects of pump subunit palmitoylation.

Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalBiochemical Society Transactions
Volume41
Issue number1
DOIs
Publication statusPublished - Feb 2013

Keywords

  • SODIUM-POTASSIUM PUMP
  • heart
  • phospholemman
  • PHOSPHORYLATION
  • NA,K-ATPASE
  • PHOSPHOLEMMAN
  • CRYSTAL-STRUCTURE
  • S-GLUTATHIONYLATION
  • TRANSPORT
  • FXYD
  • palmitoylation
  • PROTEIN-KINASE-C
  • OXIDANT-INDUCED ACTIVATION
  • REDOX REGULATION
  • Na+ pump
  • ion transport

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