Chlamy_ATPase_2023
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ABSTRACT:
PROVIDER: PRJEB64655 | ENA |
REPOSITORIES: ENA
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Project description:In the model green alga Chlamydomonas (Chlamydomonas reinhardtii), the synthesis of several chloroplast-encoded photosynthetic subunits is feedback-regulated by the assembly state of the respective protein complex. This regulation is known as control by epistasy of synthesis (CES) and matches protein synthesis with the requirements of protein complex assembly in photosystem II (PSII), the cytochrome b6f complex (Cyt b6f), photosystem I (PSI), ATP synthase and Rubisco . In embryophytes, however, CES was only described to coordinate synthesis of the large and small subunits of Rubisco, raising the question if additional CES mechanisms exist in land plants or if stoichiometric photosynthetic protein accumulation is only achieved by the wasteful degradation of excess subunits. We systematically examined suitable tobacco and Arabidopsis mutants with assembly defects in PSII, PSI, Cyt b6f complex, ATP synthase, NDH (NAD(P)H dehydrogenase-like) complex and Rubisco for feedback regulation. Thereby, we validated the CES in Rubisco and uncovered translational feedback regulation in PSII, involving psbA, psbB, psbD and psbH and in Cyt b6f, connecting PetA and PetB protein synthesis. Remarkably, some of these feedback regulation mechanisms are not conserved between the green alga and embryophytes. Our data do not provide any evidence for CES in PSI, ATP synthase or NDH complex assembly in embryophytes. In addition, our data disclose translational feedback regulation adjusting PSI levels with PSII accumulation. Overall, we discovered commonalities and differences in assembly-dependent feedback regulation of photosynthetic complexes between embryophytes and green algae.
2025-07-01 | GSE286011 | GEO
Project description:Different high temperatures adversely affect crop and algal yields with various responses in photosynthetic cells. The list of genes required for thermotolerance remains elusive. Additionally, it is unclear how carbon source availability affects heat responses in plants and algae. We utilized the insertional, indexed, genome-saturating mutant library of the unicellular, eukaryotic green alga Chlamydomonas reinhardtii to perform genome-wide, quantitative, pooled screens under moderate (35oC) or acute (40oC) high temperatures with or without organic carbon sources. We identified heat-sensitive mutants based on quantitative growth rates and identified putative heat tolerance genes (HTGs). By triangulating HTGs with heat-induced transcripts or proteins in wildtype cultures and MapMan functional annotations, we present a high/medium-confidence list of 933 Chlamydomonas genes with putative roles in heat tolerance. Triangulated HTGs include those with known thermotolerance roles and novel genes with little or no functional annotation. About 50% of these high-confidence HTGs in Chlamydomonas have orthologs in green lineage organisms, including crop species. Arabidopsis thaliana mutants deficient in the ortholog of a high-confidence Chlamydomonas HTG were also heat sensitive. This work expands our knowledge of heat responses in photosynthetic cells and provides engineering targets to improve thermotolerance in algae and crops.
2023-02-06 | GSE221132 | GEO
Project description:The goal of this analysis was to identify the ribosomal RNA content of the mitochondrial risome of Chlamydomonas reinhardtii green alga
2021-10-21 | GSE171125 | GEO
Project description:Sequencing of ATP synthase mutants in C. reinhardtii
| PRJNA1002979 | ENA
Project description:RNA populations in Chlamydomonas reinhardtii Keywords: Highly parallel pyrosequencing Small RNAs were prepared from Chlamydomonas reinhardtii total extracts,ligated to a 3' adaptor and a 5' acceptor sequentially, and then RT-PCR amplified. PCR products were reamplified using a pair of 454 cloning primers and provided to 454 Life Sciences (Branford, CT) for sequencing. For technical details, see Tao Zhao, Guanglin Li, Shijun Mi, Shan Li, Gregory J. Hannon, Xiu-Jie Wang, and Yijun Qi. 2007. A Complex System of Small RNAs in the Unicellular Green Alga Chlamydomonas reinhardtii. Genes & Development
2007-05-15 | E-GEOD-7308 | biostudies-arrayexpress
Project description:This study aims at investigating the link between internalized inorganic or methyl Hg and the global expression of genes, obtained by high-throughput sequencing (RNA-Seq), in the microalga Chlamydomonas reinhardtii. Algal cells were exposed two hours in a simplified artificial medium spiked with series of inorganic Hg concentrations (0.1, 1, 100 nM Hg) or series of methyl Hg concentrations (0.05, 0.5, 5, 50 nM CH3Hg).
2017-06-27 | GSE65109 | GEO
Project description:Liquid cultures of the unicellular green alga, Chlamydomonas reinhardtii were grown in media with 6 uM Mn (control) or 1000 uM Mn (experimental), and analyzed by RNA-Seq to identify genes that are differentially expressed in response to excess Mn.
2022-03-25 | GSE169756 | GEO
Project description:This study aims at investigating the link between internalized inorganic or methyl Hg and the global expression of genes, obtained by high-throughput sequencing (RNA-Seq), in the microalga Chlamydomonas reinhardtii. Algal cells were exposed two hours in a simplified artificial medium spiked with series of inorganic Hg concentrations (0.1, 1, 100 nM Hg) or series of methyl Hg concentrations (0.05, 0.5, 5, 50 nM CH3Hg). Three biological replicates were assessed for each of the 8 tested conditions: Control, 3 Hg concentrations, 4 CH3Hg concentrations.
2017-06-27 | E-GEOD-65109 | biostudies-arrayexpress
Project description:Purpose; Here we compare the transcriptomic effects of three REEs; Ce, Tm and Y, and a mixture of all three on Chlamydomonas reinhardtii in order to determine the degree of overlap of their effects. Methods; Transcriptome profiling (RNA-Seq) analysis performed on Chlamydomonas reinhardtii (wild-type strain, CC-125 aka 137c, Chlamydomonas resource center) exposed for 2 h to one of three soluble REEs (Ce, Tm, Y) salts at 0.5 μM or to an equimolar ternary mixture of these REEs. Illumina HiSeq (v.4) was used for the paired-end sequencing (2 × 100 base pairs) of 25 samples (5 replicates for each treatment: Ce; Tm; Y; Mix; Controls). For each sample, ca. 55 million of reads with their sequences, identification and quality scores were stored in two FastQ files. Results; Known functions of the differentially expressed genes support effects of REEs on protein processing in the endoplasmic reticulum, phosphate transport and the homeostasis of Fe and Ca. The only stress response detected related to protein misfolding in the endoplasmic reticulum. When the REEs were applied as a mixture, antagonistic effects were overwhelmingly observed with transcriptomic results suggesting that the REEs were initially competing with each other for bio-uptake. Conclusions; Our study represents the first detailed analysis of REE transcriptomic effects in a green microalga that is ubiquitous to fresh waters. Results generated by RNA-seq technology suggest that the approach of government agencies to regulate the REEs using biological effects data from single metal exposures may be a largely conservative approach.
2021-06-14 | GSE176268 | GEO