Ribulose Diphosphate Carboxylase Synthesis in Euglena: Increased Enzyme Activity after Transferring Regreening Cells to Darkness
AUTOR(ES)
Lord, J. Michael
RESUMO
The transfer of dark-grown cultures of Euglena gracilis Klebs strain Z regreening in the light back into darkness resulted in a dramatic increase in ribulose diphosphate carboxylase activity. On a culture volume basis activity increased 4-fold over a 24-hour dark period, although on a protein basis activity declined because of rapid cell division. Mixed assays with light- and dark-growing cell extracts provided no evidence for the removal of an inhibitor of ribulose diphosphate carboxylase upon transferring regreening cells back to darkness. Although ribulose diphosphate carboxylase activity increased over a 24-hour dark period, there was no concomitant increase in the potential of the cells for photosynthetic carbon dioxide fixation.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=541728Documentos Relacionados
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