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Does a light-harvesting protochlorophyllide a/b-binding protein complex exist?

G A Armstrong·K Apel·W Rüdiger
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Abstract

Recent in vitro studies have led to speculation that a novel light-harvesting protochlorophyllide a/b-binding protein complex (LHPP) might exist in dark-grown angiosperms. Structurally, it has been suggested that LHPP consists of a 5:1 ratio of dark-stable ternary complexes of the light-dependent NADPH: protochlorophyllide oxidoreductases A and B containing nonphotoactive protochlorophyllide b and photoactive protochlorophyllide a, respectively. Functionally, LHPP has been hypothesized to play major roles in establishing the photosynthetic apparatus, in protecting against photo-oxidative damage during greening, and in determining etioplast inner membrane architecture. However, the LHPP model is not compatible with other studies of the pigments and the pigment-protein complexes of dark-grown angiosperms. Protochlorophyllide b, which is postulated to be the major light-harvesting pigment of LHPP, has, for example, never been detected in etiolated seedlings. This raises the question: does LHPP exist?

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LightPhotosynthesisPlant DevelopmentPlantsPlastidsProtein BindingProtochlorophyllideJournal ArticleReview

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G A Armstrong, K Apel, W Rüdiger. 2000. Does a light-harvesting protochlorophyllide a/b-binding protein complex exist?. https://doi.org/10.1016/s1360-1385(99)01513-7

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