Modes of action of uncouplers in thylakoids External and internal pH profiles of electron transport

The pH dependence of electron transport in isolated lettuce chloroplasts can be simulated by a model involving four ionizable groups: two facing the inside and two facing the outside of the thylakoids. The pH dependence can be resolved into separate pH profiles for the outside and the inside of the...

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Bibliographic Details
Published inFEBS letters Vol. 243; no. 2; pp. 218 - 222
Main Authors Schönfeld, Mordechay, Schickler, Hedva
Format Journal Article
LanguageEnglish
Published 30.01.1989
Subjects
Lactuca sativa
thylakoid membranes
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Summary:The pH dependence of electron transport in isolated lettuce chloroplasts can be simulated by a model involving four ionizable groups: two facing the inside and two facing the outside of the thylakoids. The pH dependence can be resolved into separate pH profiles for the outside and the inside of the thylakoids, with optima at 7.1 and 5.6, respectively. A ΔpH of 3 units across the thylakoid membrane allows only partial overlapping of the two profiles and relatively low rates of electron transport. Uncouplers stimulate electron transport by reducing the ΔApH, thereby improving the overlapping of the two pH profiles.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(89)80133-4