Dataset Information

Proteomic analysis of different pgr5 mutants and pgrl1ab in Arabidopsis thaliana

ABSTRACT: PGR5 is a small chloroplast protein that performs cyclic electron flow (CEF) around photosystem I and it is required for the proton gradient generation across the thylakoid membrane. The level of this protein is closely regulated by PGRL1. However, the molecular mechanism of PGR5 is still elusive. In this work, we have generated a new pgr5 mutant in Arabidopsis using CRISPR-Cas9 technology, pgr5-Cas, completely devoid of PGR5. We performed comparative proteomic analysis on pgr5-1 and pgr5-Cas lines (#1 and #2), as well as on pgrl1ab mutant.

INSTRUMENT(S): impact II

ORGANISM(S): Arabidopsis Thaliana (mouse-ear Cress)

SUBMITTER: Giada Marino

LAB HEAD: Dario Leister

PROVIDER: PXD028563 | Pride | 2022-08-12

REPOSITORIES: Pride

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Publications

Commonalities and specialties in photosynthetic functions of PROTON GRADIENT REGULATION5 variants in Arabidopsis.

Penzler Jan-Ferdinand JF Marino Giada G Reiter Bennet B Kleine Tatjana T Naranjo Belen B Leister Dario D

Plant physiology 20221001 3

The PROTON GRADIENT REGULATION5 (PGR5) protein is required for trans-thylakoid proton gradient formation and acclimation to fluctuating light (FL). PGR5 functionally interacts with two other thylakoid proteins, PGR5-like 1 (PGRL1) and 2 (PGRL2); however, the molecular details of these interactions are largely unknown. In the Arabidopsis (Arabidopsis thaliana) pgr5-1 mutant, the PGR5G130S protein accumulates in only small amounts. In this work, we generated a knockout allele of PGR5 (pgr5-Cas) us ...[more]

PMID: 35946785

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Project description:Plastids contain multiple copies of the plastid chromosome, folded together with proteins and RNA into nucleoids. The degree to which components of the plastid gene expression and protein biogenesis machineries are nucleoid associated, and the factors involved in plastid DNA organization, repair, and replication, are poorly understood. To provide a conceptual framework for nucleoid function, we characterized the proteomes of highly enriched nucleoid fractions of proplastids and mature chloroplasts isolated from the maize (Zea mays) leaf base and tip, respectively, using mass spectrometry. Quantitative comparisons with proteomes of unfractionated proplastids and chloroplasts facilitated the determination of nucleoid-enriched proteins. This nucleoid-enriched proteome included proteins involved in DNA replication, organization, and repair as well as transcription, mRNA processing, splicing, and editing. Many proteins of unknown function, including pentatricopeptide repeat (PPR), tetratricopeptide repeat (TPR), DnaJ, and mitochondrial transcription factor (mTERF) domain proteins, were identified. Strikingly, 70S ribosome and ribosome assembly factors were strongly overrepresented in nucleoid fractions, but protein chaperones were not. Our analysis strongly suggests that mRNA processing, splicing, and editing, as well as ribosome assembly, take place in association with the nucleoid, suggesting that these processes occur cotranscriptionally. The plastid developmental state did not dramatically change the nucleoid-enriched proteome but did quantitatively shift the predominating function from RNA metabolism in undeveloped plastids to translation and homeostasis in chloroplasts. This study extends the known maize plastid proteome by hundreds of proteins, including more than 40 PPR and mTERF domain proteins, and provides a resource for targeted studies on plastid gene expression. Details of protein identification and annotation are provided in the Plant Proteome Database.

Dataset Information

Proteomic analysis of different pgr5 mutants and pgrl1ab in Arabidopsis thaliana

Publications

Commonalities and specialties in photosynthetic functions of PROTON GRADIENT REGULATION5 variants in Arabidopsis.

Similar Datasets

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