Influence of CO2concentration on carbon concentrating mechanisms in cyanobacteria and green algae: a proteomic approach

Rishiram Ramanan, Nadimuthu Vinayagamoorthy, Saravana Devi Sivanesan, Krishnamurthi Kannan, Tapan Chakrabarti
2012 ALGAE  
Carbon concentrating mechanisms play a vital role in photosynthesis in microalgae and cyanobacteria especially in the proper functioning of Rubisco and assimilation of carbon via the Calvin cycle. This study evaluates the role of carbon dioxide on carbon concentrating mechanism (CCM) in a cynaobacteria, Spirulina platensis and a microalga, Chlorella sp. 786. The study organisms were grown in both atmospheric (control sample, 0.035%) and high (exposed sample, 10%) CO 2 concentrations. Second
more » ... rations. Second dimension (2D) electrophoresis revealed a huge difference in the protein profiles of both organisms suggesting the induction of CCM related proteins in the sample maintained at atmospheric CO 2 concentration and the repression of CCM related proteins in the sample maintained at 10% CO 2 . Liquid chromatography-mass spectroscopy analysis revealed the presence of two important C i transporter proteins in the control sample of S. platensis, namely ferredoxin-NADP + reductase and ATP binding cassette (ABC) transport system protein. These proteins were only expressed in the control sample and were downregulated or not expressed at all in the exposed sample. Consequently, this study conclusively proves that CCMs are only inducted at low CO 2 concentrations and are not functional at high CO 2 concentration.
doi:10.4490/algae.2012.27.4.295 fatcat:yrjgbjhodbbyhhhyzozjqk37p4