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Related Experiment Video

Updated: May 8, 2026

High-Throughput Metabolic Profiling for Model Refinements of Microalgae

High-Throughput Metabolic Profiling for Model Refinements of Microalgae

Published on: December 4, 2021

PPR proteins of green algae.

Nicolas J Tourasse¹, Yves Choquet¹, Olivier Vallon¹

¹UMR 7141 CNRS/UPMC; Institut de Biologie Physico-Chimique; F-75005 Paris, France.

|September 12, 2013

Summary

This study identified 154 pentatricopeptide repeat (PPR) proteins in green algae, revealing their evolutionary paths and potential functions in RNA regulation and chloroplast DNA maintenance. The findings are cataloged in the online PPRdb database.

Keywords:

chloroplast cyclin evolution green algae mitochondrion pentatricopeptide repeat small MutS-related tRNA methyltransferase

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Area of Science:

Plant Molecular Biology
Genomics
Evolutionary Biology

Background:

Pentatricopeptide repeat (PPR) proteins are crucial for plant organelle gene expression.
Understanding the diversity and evolution of PPR proteins in green algae is essential for comprehending their functional roles.

Purpose of the Study:

To identify and classify PPR proteins in green algae genomes.
To investigate the evolutionary history and functional diversification of PPR proteins.
To establish a comprehensive database of PPR proteins and their associated data.

Main Methods:

Utilized the FT-Rep algorithm for identifying PPR proteins and repeats across nine sequenced green algae genomes.
Performed phylogenetic analysis of PPR repeats to infer evolutionary relationships.
Annotated additional domains within PPR proteins to predict potential functions.
Compiled data into an accessible online database, PPRdb.

Main Results:

Identified 154 PPR proteins and 1201 repeats, grouped into 47 orthologous groups.
Discovered conserved PPR proteins (MRL1, HCF152, MCA1, PPR7) across the green lineage and Chlorophyta, with roles in mRNA stabilization and binding.
Observed clade-specific PPRs exhibiting gene loss, duplication, and horizontal transfer events.
Characterized PPR proteins with additional domains, including methyltransferase_4, CBS, SmR, and cyclin domains, suggesting roles in RNA methylation, nucleoid binding, and DNA nicking.

Conclusions:

The study provides a comprehensive catalog and evolutionary framework for PPR proteins in green algae.
Identified conserved and lineage-specific PPR proteins, highlighting diverse evolutionary strategies.
Revealed potential novel functions for PPR proteins, including RNA methylation and plastid chromosome modification.