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The effect of viscosity-increasing agents on ATP synthesis in chloroplast thylakoids

Content Provider	Springer Nature Link
Author	Kartashov, I. M. Opanasenko, V. K. Malyan, A. N.
Copyright Year	2015
Abstract	The effect of an increase in the viscosity of the medium on cyclic photophosphorylation in chloroplast thylakoids and the Ca$^{2+}$-dependent ATP hydrolysis by the chloroplast coupling factor CF$_{1}$ was studied. Using 0.1–0.2 mM ADP, it was found that the rate of ATP synthesis decreases after the addition of various agents that increase the viscosity of the medium (sucrose, dextran 40, or polyethylene glycol 6000) provided that these agents cause neither uncoupling nor electron-transport inhibition in the absence of ADP. Dextran and polyethylene glycol inhibited ATP synthesis by 50% when their concentrations were much lower (6–10%) than that of sucrose (30–40%), while 50% inhibition of the Ca$^{2+}$-dependent ATP hydrolysis by CF$_{1}$-ATPase was observed at higher concentrations of dextran and polyethylene glycol (9–13%) and lower concentrations of sucrose (about 20%). For ADP, the effective Michaelis constant (K $_{M}$) was shown to increase by factors of 2–3 with increasing viscosity, while the maximum rate of cyclic photophosphorylation remained virtually unchanged. The dependence of K $_{M}$ on the medium viscosity can serve as a criterion for the operation of diffusion-controlled photophosphorylation. Possible mechanisms of the diffusion of ADP and ATP are discussed.
Starting Page	387
Ending Page	391
Page Count	5
File Format	PDF
ISSN	00063509
Journal	Biophysics
Volume Number	60
Issue Number	3
e-ISSN	15556654
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-08-15
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	chloroplast photophosphorylation electron transport ATP hydrolysis chloroplast coupling factor CF$_{1}$ viscosity Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Biophysics

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