Caloxin-derived peptides for the inhibition of plasma membrane calcium ATPases - Normandie Université Access content directly
Journal Articles Peptides Year : 2022

Caloxin-derived peptides for the inhibition of plasma membrane calcium ATPases

Jean Boutin
Stéphane Bedut
  • Function : Author
Magali Jullian
  • Function : Author
Mathieu Galibert
  • Function : Author
Lukasz Frankiewicz
  • Function : Author
Philippe Gloanec
  • Function : Author
Gilles Ferry
  • Function : Author
Karine Puget
  • Function : Author

Abstract

Plasma membrane calcium ATPases (PMCAs) are a family of transmembrane proteins responsible for the extrusion of cytosolic Ca2+ to the extracellular milieu. They are important players of the calcium homeostasis possibly implicated in some important diseases. The reference inhibitors of PMCA extruding activity are on one hand ortho-vanadate (IC50 in the 30 mM range), and on the other a series of 12- to 20-mer peptides named caloxins (IC50 in the 100 µM scale). As for all integral membrane proteins, biochemistry and pharmacology are difficult to study on isolated and/or purified proteins. Using a series of reference blockers, we assessed a pharmacological window with which we could study the functionality of PMCAs in living cells. Using this system, we screened for alternative versions of caloxins, aiming at shortening the peptide backbone, introducing non-natural amino acids, and overall trying to get a glimpse at the structure-activity relationship between those new peptides and the protein in a cellular context. We describe a short series of equipotent 5-residue long analogues with IC50 in the low µM range.

Dates and versions

hal-03759568 , version 1 (24-08-2022)

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Jean Boutin, Stéphane Bedut, Magali Jullian, Mathieu Galibert, Lukasz Frankiewicz, et al.. Caloxin-derived peptides for the inhibition of plasma membrane calcium ATPases. Peptides, 2022, 154, pp.170813. ⟨10.1016/j.peptides.2022.170813⟩. ⟨hal-03759568⟩
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