title: Unique regulation of the Calvin cycle in the ultrasmall green alga Ostreococcus.
abstract: Glyceraldehyde-3-phosphate dehydrogenase (GapAB) and CP12 are two major players in controlling the inactivation of the Calvin cycle in land plants at night. GapB originated from a GapA gene duplication and differs from GapA by the presence of a specific C-terminal extension that was recruited from CP12. While GapA and CP12 are assumed to be generally present in the Plantae (glaucophytes, red and green algae, and plants), up to now GapB was exclusively found in Streptophyta, including the enigmatic green alga Mesostigma viride. However, here we show that two closely related prasinophycean green algae, Ostreococcus tauri and Ostreococcus lucimarinus, also possess a GapB gene, while CP12 is missing. This remarkable finding either antedates the GapA/B gene duplication or indicates a lateral recruitment. Moreover, Ostreococcus is the first case where the crucial CP12 function may be completely replaced by GapB-mediated GapA/B aggregation.
authors: Steven
authors: S
authors: Robbens
authors: Jörn
authors: J
authors: Petersen
authors: Henner
authors: H
authors: Brinkmann
authors: Pierre
authors: P
authors: Rouzé
authors: Yves
authors: Y
authors: Van de Peer
mesh_terms: D020418:Algal Proteins / Q000235:genetics / Q000378:metabolism; D000460:Chlorophyta / Q000235:genetics / Q000378:metabolism*; D019143:Evolution, Molecular; D005786:Gene Expression Regulation; D010788:Photosynthesis / Q000235:genetics / Q000502:physiology*; D010802:Phylogeny
chemical_list: D020418:Algal Proteins