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A cyanobacterial screening platform for mutant variants of a Form II Rubisco

ABSTRACT: Cyanobacterial Form II Rubisco screening platform

PROVIDER: PRJEB79580 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR13618500.fastq.gz	Fastqsanger.gz
	ERR13618501.fastq.gz	Fastqsanger.gz
	ERR13618502.fastq.gz	Fastqsanger.gz
	ERR13618503.fastq.gz	Fastqsanger.gz
	ERR13618504.fastq.gz	Fastqsanger.gz

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A cyanobacterial screening platform for Rubisco mutant variants

Project description:Rubisco is the main entry point of inorganic carbon into the biosphere and a central player in the global carbon system. Its relatively low catalytic constant as well as its tendency to also accept O2 as a substrate have made it a common target of enzyme engineering. We have developed an enzyme engineering and screening platform for Rubisco using the model cyanobacterium Synechocystis sp. PCC 6803. Starting with the Form II Rubisco from Gallionella, we first show that the enzyme can replace the native Form I Rubisco in Synechocystis and that growth rates become sensitive to CO2 and O2 levels. We address the challenge of designing a zero-shot input library, without prior experimental knowledge, by coupling the phylogenetically-guided model EVmutation with “in silico evolution”. Starting with this targeted mutagenesis library, we used competitive growth coupled to deep sequencing to compare the properties of Rubisco protein variants under different cultivation conditions. We identified an amino acid exchange which increased the thermostability of Gallionella Rubisco and conveyed resilience to detrimental exchanges. The establishment of this platform is a first step towards high-throughput screening of Rubisco variants in Synechocystis and creating optimized enzyme variants to accelerate the Calvin-Benson-Bassham cycle in cyanobacteria and possibly chloroplasts. DIA proteomics was used to compare relative quantities of the native and heterologous RuBisCO, as well as the proteome at large at different gas conditions and with or without the heterologous enzyme.

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Project description:Multiple studies have shown Rubisco to be subject to Lys-acetylation at various residues; however, conflicting reports exist about the biological significance of these post-translational modifications. One aspect of the Lys-acetylation that has not been addressed in plants generally, or with Rubisco specifically, is the stoichiometry at which these Lys-acetylation events occur. As a method to ascertain which Lys-acetylation sites on Arabidopsis Rubisco might be of regulatory importance, we purified Rubisco from leaves in both the day and night-time and performed independent mass-spectrometry based methods to determine the stoichiometry of Rubisco Lys-acetylation events.

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