Light Activation of Mg2+-dependent Adenosine 5′-Triphosphatase in Isolated Euglena Chloroplasts 1
AUTOR(ES)
Chang, Irene C.
RESUMO
Enhancement of Mg2+-dependent ATPase activity in Euglena gracilis chloroplasts by light in the presence of a sulfhydryl compound has been demonstrated. A number of uncouplers and energy transfer inhibitors were studied for their effects on the light enhancement of ATPase activity simultaneously with their effects on photophosphorylation. Results suggest that the light-enhanced ATPase activity in Euglena chloroplasts is an energy-initiated process and that the energy is supplied through electron flow upon illumination of the chloroplasts. However, by studying the difference in their response toward the various uncouplers and inhibitors, it seems that the two processes (photohydrolysis of ATP and photophosphorylation) share only the latter part of their energy-transferring pathway.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=365952Documentos Relacionados
- Oxygen exchange in the gamma-phosphoryl group of protein-bound ATP during Mg2+-dependent adenosine triphosphatase activity of myosin.
- Effects of Germination on NA+-K+-stimulated Adenosine 5′-Triphosphatase and ATP-dependent Ion Transport of Isolated Membranes from Cotyledons
- Evidence for adenosine diphosphate ribosylation of Ca2+, Mg2+-dependent endonuclease.
- Electron Transport Phosphorylation Coupled to Fumarate Reduction by H2- and Mg2+-Dependent Adenosine Triphosphatase Activity in Extracts of the Rumen Anaerobe Vibrio succinogenes
- Electron transport phosphorylation coupled to fumarate reduction by H2- and Mg2+-dependent adenosine triphosphatase activity in extracts of the rumen anaerobe Vibrio succinogenes.