CCM is intimately related to www.selleckchem.com/products/Acadesine.html many fundamental metabolisms neighboring photosynthesis, and thus CO2 availability and the extent of CCM operation would influence these significantly. Kranz et al. (2011) reviewed the effect

of pCO2 increase on the bloom-forming marine cyanobacterium, Trichodesmium erythraeum. This diazotrophic, filamentous cyanobacterium exhibits extraordinary stimulation of growth and Capmatinib primary production, including N2 fixation, in response to increase in pCO2. Stimulation of nitrogenase under light and subsequent higher N2 fixation occurred concomitantly with the down-regulation of the HCO3 − transport under high CO2. This environmentally relevant phenomenon in a cyanobacterium is ascribed to a transition of energy supply from DIC uptake to N fixation rather than an increase in gross energy production. Unlike the C4 type biochemical selleck inhibitor CCM which captures CO2 in an organic acid, the algal biophysical CCM maintains inorganic carbon as bicarbonate, throughout the process of uptake to its fixation by Rubisco and thus, any free CO2 formed in the

process, can readily leak out of cells, short-circuiting the flow of DIC. Araujo et al. (2011) demonstrated experimentally that, in the filamentous cyanobacterium, Leptolyngbya sp. CPCC696, originally obtained from Lake Erie, DIC transport increased as a function of light energy; Amisulpride after saturation, however, excess light excitation pressure seemed to be

dissipated by DIC recycling both internally and at the plasma membrane. The dissipation of excess light energy due to the “short circuit” between uptake and leakage indicated a role for the biophysical CCM in short-term light acclimation. Kern et al. (2011) reviewed the evolutionary origins of photorespiratory pathway in higher plants and concluded that the chloroplastic and peroxysomal components of the pathway were most probably derived from a cyanobacterial endosymbiosis whereas the mitochondrial components were likely of proteobacterial lineage. Molecular studies on the eukaryotic CCM still lag well behind those on cyanobacteria. The green alga, Chlamydomonas reinhardtii, is the most extensively studied eukaryote and recent accomplishment of genome sequencing, together with the establishment of an RNA sequence database and reverse genetics tools, enables this organism to be a model organism for the study of the green algal CCM. Wang et al. (2011) reviewed the recent progress in the study of the C. reinhardtii CCM and gave an analysis of the role of putative CCM components based upon transcriptome data. Key components, which have been found recently, for a pyrenoid-based CCM, LCIB/C, were described and a CO2 recapturing hypothesis by LCIB/C complex surrounding the pyrenoid was proposed in the review.