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Pyrenoid formation is associated with RuBisCO small subunit alpha-helices in Chlamydomonas

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Aquatic photosynthesisers contribute to nearly half of the global net primary production, despite slow diffusivity and low availability of free CO2 in water. This productivity is supported by a series of biophysical carbon concentrating mechanisms (CCM), which use transmembrane transporters, carbonic anhydrases, and the packaging of the carboxylating enzyme RuBisCO into a sub-cellular microcompartment. In eukaryotic algae, this microcompartment is the pyrenoid, which remains to this date without a precise molecular definition. Here, using Chlamydomonas reinhardtii, a model unicellular green alga that induces a CCM when grown under atmospheric CO2 levels, we present evidence that the small subunits of RuBisCO play a crucial role in the packaging of the enzyme into the pyrenoid, and that pyrenoid occurrence is directly related to CCM expression.

This talk is part of the Plant Sciences Research Seminars series.

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