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The effect of SO3--on the activity of ribulose-1,5-diphosphate carboxylase in isolated spinach chloroplasts

โœ Scribed by Irmgard Ziegler

Publisher
Springer-Verlag
Year
1972
Tongue
English
Weight
433 KB
Volume
103
Category
Article
ISSN
0032-0935

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โœฆ Synopsis

S03--inhibits the activity of ribulose-l,5-diphosphate carboxylase in isolated spinach chloroplasts. It shows a non-competitive inhibition pattern with respect to ribulose-l,5-diphosphate and Mg++ but a competitive one with respect to I-ICOa-. The Ki-values are 14 mM S03--and 9.5 mM SOa--respectively for the non-competitive inhibition but only 3.0 mM S03--in the case of competitive inhibition with HC03--as a substrate. Thus it is concluded that the competitive inhibition type will predominate at low SO~--and low internal C02 concentrations.

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