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Light- induced electron transfer and ATP synthesis in a carotene synthesizing insect.

Abstract：

:A singular adaptive phenotype of a parthenogenetic insect species (Acyrthosiphon pisum) was selected in cold conditions and is characterized by a remarkable apparition of a greenish colour. The aphid pigments involve carotenoid genes well defined in chloroplasts and cyanobacteria and amazingly present in the aphid genome, likely by lateral transfer during evolution. The abundant carotenoid synthesis in aphids suggests strongly that a major and unknown physiological role is related to these compounds beyond their canonical anti-oxidant properties. We report here that the capture of light energy in living aphids results in the photo induced electron transfer from excited chromophores to acceptor molecules. The redox potentials of molecules involved in this process would be compatible with the reduction of the NAD+ coenzyme. This appears as an archaic photosynthetic system consisting of photo-emitted electrons that are in fine funnelled into the mitochondrial reducing power in order to synthesize ATP molecules.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Valmalette JC,Dombrovsky A,Brat P,Mertz C,Capovilla M,Robichon A

doi

10.1038/srep00579

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

579

issn

2045-2322

journal_volume

2

pub_type

杂志文章

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