Light Modulation of Glucose-6-Phosphate Dehydrogenase: Partial Characterization of the Light Inactivation System and its Effects on the Properties of the Chloroplastic and Cytoplasmic Forms of the Enzyme 1

AUTOR(ES)

Anderson, Louise E.

RESUMO

Light inactivation of glucose-6-phosphate dehydrogenase within the pea (Pisum sativum L.) leaf chloroplast has a narrow pH optimum between 7.2 and 7.4 and is NADP-sensitive. The pH optimum for dark activation is slightly lower. Inactivation apparently results in a simple decrease in maximal velocity of the chloroplastic and cytoplasmic forms of the enzyme with no concomitant change in pH optimum or Km (glucose 6-phosphate).

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