Effects of chlorophenols on isolated class A chloroplasts and thylakoids: a QSAR study.

Abstract:

:A series of 22 chlorinated phenols was studied for their effects on photosynthesis of isolated chloroplasts. Each chlorophenol was an uncoupler, but the uncoupling activity depended upon substitution. The di-, tri-, or pentachloro substitution greatly enhanced the uncoupling activity. However, 2,6 substitution was not favorable to the uncoupling activity. Fifty percent uncoupling of photophosphorylations was obtained for concentrations between 4 mM for phenol itself, and 20 microM for pentachlorophenol. The quantitative structure-activity relationship (QSAR) study indicated a good relationship between, on the one hand, steric and electronic parameters, and, on the other hand, the uncoupling activity. In such equations, the A parameter describing ortho-substitution, always presented a negative sign. No good equation could be obtained with only log P and sigma. At concentrations which generally induced uncoupling, the chlorinated phenols inhibited the electron transfer in thylakoids. Di, tri, or penta substitution by chlorine enhanced the inhibition. A good relation appeared between this effect and the steric parameters MR and A. The study of isolated class A chloroplasts demonstrated that the uncoupling and the inhibition of the electron transfer in thylakoids could explain the effect of the chlorophenols on the whole photosynthetic mechanism. The effects of phenols on isolated chloroplasts were compared to those obtained with the same series on mitochondria. To explain the differences between QSAR equations, on the one hand for chloroplasts, and, on the other hand, for mitochondria, we suggested a selective binding of chlorinated phenols to proteins of the biological membranes.

journal_name

Ecotoxicol Environ Saf

authors

Tissut M,Taillandier G,Ravanel P,Benoit-Guyod JL

doi

10.1016/0147-6513(87)90040-6

subject

Has Abstract

pub_date

1987-02-01 00:00:00

pages

32-42

issue

1

eissn

0147-6513

issn

1090-2414

pii

0147-6513(87)90040-6

journal_volume

13

pub_type

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