Light-dependent and light-triggered adenosine triphosphatases
in chloroplasts
Bennun, A. and Avron, M.
Three types of adenosine triphosphatases have been reported
in chloroplasts. In the dark, chloroplasts catalyse the hydrolysis
of ATP at a very low rate. This rate is substantially increased
by light, and is increased even further by the presence of
calcium ions. Also the addition of a sulfhydrvl reagent and
magnesium ions, induce a light-dependent ATPase in chloroplasts.
Recent studies by Hoch & Martin and Marchant & Packer,
have demonstrated that light is necessary for the initiation
of the latter ATPase activity, but not for its further functioning.
A more proper term for the magnesium-, and sulfhvdryl-dependent
ATPase of chloroplasts should therefore be a light-triggered
ATPase.
Biochimica et Biophysica Acta, 79, (1964), 646-648