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Role of a rhomboid protease in a CO2-concentrating mechanism

Role of a rhomboid protease in a CO2-concentrating mechanism

Ibrahim, Iskander, Richards, Jack, Rickard, Abigail and Thompson, Elinor (2016) Role of a rhomboid protease in a CO2-concentrating mechanism. In: Royal Society Discussion meeting Enhancing photosynthesis in crop plants: targets for improvement. Royal Society.

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Abstract

Photosynthetic efficiency of some of the most important global crop plants is limited by the low affinity for CO2 of ribulose bisphosphate carboxylase–oxygenase (Rubisco) and the wastage of energy from photosynthesis via the release of fixed CO2 in a side reaction with oxygen. Experimental increases in the CO2 concentration around C3 plants did enhance the level of photosynthesis and yield, so it is of interest to investigate the crop-improvement potential of the CO2-concentrating mechanism (CCM) utilised by cyanobacteria to overcome the limitations of Rubisco. Utilising this mechanism of improving Rubisco efficiency and thus crop yield is attractive as it does not necessarily require major changes to leaf anatomy.

The cyanobacterial CCM allows these photosynthetic prokaryotes to increase CO2 concentration up to 1000-fold near carboxysomes, protein-walled compartments of localised Rubisco, and increased CO2 levels also activate Rubisco and repress photorespiration. Within a complex network of CCM regulation is control at the level of transcription for genes encoding CO2-uptake and bicarbonate transport. Amongst the regulatory components are LysR-type transcription factors acting as activators or repressors, and the protease FtsH2. We report here how a rhomboid protease also plays a pivotal role in transcriptional control of CCM genes in Synechocystis sp. PCC6803.

Item Type: Conference Proceedings
Title of Proceedings: Royal Society Discussion meeting Enhancing photosynthesis in crop plants: targets for improvement
Uncontrolled Keywords: FtsH; rhomboid; protease; carbon dioxide; photosynthesis; microbiology
Subjects: Q Science > QH Natural history > QH301 Biology
S Agriculture > SB Plant culture
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Life & Sports Sciences
Last Modified: 11 Jun 2018 13:45
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/15802

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