The Ca2+ affinity of the plasma membrane Ca2+ pump is controlled by alternative splicing

A. Enyedi, A. K. Verma, R. Heim, H. P. Adamo, A. G. Filoteo, E. E. Strehler, J. T. Penniston

Research output: Contribution to journalArticlepeer-review

111 Scopus citations


The plasma membrane Ca2+ pump is a calmodulin-regulated P-type ATPase that is an essential element in controlling intracellular Ca2+ concentration. Studies on the gene structure of this pump have revealed an alternate splice option that changes the structure of the calmodulin-binding domain. This change in the structure of the enzyme results in a reduced calmodulin affinity. Tests of the enzyme's activity in the presence of a high calmodulin concentration, approximating that found inside living cells, show that this reduced calmodulin affinity causes a reduced apparent affinity of the enzyme for Ca2+. This shift in the Ca2+ activation occurs in a Ca2+ concentration range crucial to cellular function and is probably the physiologically important consequence of the alternate splice.

Original languageEnglish (US)
Pages (from-to)41-43
Number of pages3
JournalJournal of Biological Chemistry
Issue number1
StatePublished - 1994

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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