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Action of Calcium Ions on Spinach (Spinacia Oleracea) Chloroplast Fructose Bisphosphatase and Other Enzymes of the Calvin Cycle

Overview
Journal Biochem J
Specialty Biochemistry
Date 1980 Jun 15
PMID 6258561
Citations 21
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Abstract

Thiol-treated spinach (Spinacia oleracea) chloroplast fructose bisphosphatase is powerfully inhibited by Ca2+ non-competitively with respect to its substrate, fructose 1,6-bisphosphate. 500 microM-Ca2+ causes virtually complete inhibition and the Ki is 40 microM. Severe inhibition of sedoheptulose bisphosphatase is also caused by Ca2+. A role for Ca2+ in regulation of the Calvin cycle in spinach chloroplasts is proposed.

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