Aequorin luminescence: Relation of light emission to calcium concentration - A calcium-independent component

David G. Allen, John R. Blinks, Franklyn G. Prendergast

Research output: Contribution to journalArticle

243 Scopus citations


Light emission from the calcium-sensitive bioluminescent protein aequorin was measured at calcium ion concentrations of 10-9 to 10-2 molar. At very low Ca2+ concentrations, light emission is independent of calcium ion concentration. The maximum slope of the log-log plot of light as a function of calcium ion concentration is about 2.5. The complete relation is well described by a two-state model involving three calcium-binding sites.

Original languageEnglish (US)
Pages (from-to)996-998
Number of pages3
Issue number4282
StatePublished - Jan 1 1977


ASJC Scopus subject areas

  • General

Cite this