Pyrenoid loss impairs carbon-concentrating mechanism induction and alters primary metabolism in Chlamydomonas reinhardtii

© The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.

Bibliographische Detailangaben
Veröffentlicht in:Journal of experimental botany. - 1985. - 68(2017), 14 vom: 01. Juni, Seite 3891-3902
1. Verfasser: Mitchell, Madeline C (VerfasserIn)
Weitere Verfasser: Metodieva, Gergana, Metodiev, Metodi V, Griffiths, Howard, Meyer, Moritz T
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Carbon-concentrating mechanism Chlamydomonas photosynthesis proteomics pyrenoid tandem mass spectrometry Algal Proteins Carbon 7440-44-0
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520 |a Carbon-concentrating mechanisms (CCMs) enable efficient photosynthesis and growth in CO2-limiting environments, and in eukaryotic microalgae localisation of Rubisco to a microcompartment called the pyrenoid is key. In the model green alga Chlamydomonas reinhardtii, Rubisco preferentially relocalises to the pyrenoid during CCM induction and pyrenoid-less mutants lack a functioning CCM and grow very poorly at low CO2. The aim of this study was to investigate the CO2 response of pyrenoid-positive (pyr+) and pyrenoid-negative (pyr-) mutant strains to determine the effect of pyrenoid absence on CCM induction and gene expression. Shotgun proteomic analysis of low-CO2-adapted strains showed reduced accumulation of some CCM-related proteins, suggesting that pyr- has limited capacity to respond to low-CO2 conditions. Comparisons between gene transcription and protein expression revealed potential regulatory interactions, since Rubisco protein linker (EPYC1) protein did not accumulate in pyr- despite increased transcription, while elements of the LCIB/LCIC complex were also differentially expressed. Furthermore, pyr- showed altered abundance of a number of proteins involved in primary metabolism, perhaps due to the failure to adapt to low CO2. This work highlights two-way regulation between CCM induction and pyrenoid formation, and provides novel candidates for future studies of pyrenoid assembly and CCM function 
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650 4 |a Carbon-concentrating mechanism 
650 4 |a Chlamydomonas 
650 4 |a photosynthesis 
650 4 |a proteomics 
650 4 |a pyrenoid 
650 4 |a tandem mass spectrometry 
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700 1 |a Metodieva, Gergana  |e verfasserin  |4 aut 
700 1 |a Metodiev, Metodi V  |e verfasserin  |4 aut 
700 1 |a Griffiths, Howard  |e verfasserin  |4 aut 
700 1 |a Meyer, Moritz T  |e verfasserin  |4 aut 
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