ArticleThe Plant cell2013
Chloroplast small heat shock protein HSP21 interacts with plastid nucleoid protein pTAC5 and is essential for chloroplast development in Arabidopsis under heat stress.
Article in The Plant cell, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 99 papers.
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99 citing papers in PubMed, 205 citations in OpenAlex.
- Uncovering the role of the PPR protein PHOTOSYSTEM ONE BIOGENESIS FACTOR6 in splicing chloroplast group II introns.Journal of integrative plant biology · 2026Article
- Protein-protein interaction detection in plants: from classical approaches to future perspectives.Biologia futura · 2026Review
- A small heat shock protein from Arabidopsis thaliana regulates glyceraldehyde-3-phosphate dehydrogenase in the drought tolerance.Plant cell reports · 2026Article
- Transcriptomic and Metabolic Insight Into Flavonoid Biosynthesis Underlying Black and Yellow Seed Coat Color Variation in Soybean (Plant direct · 2026Article
- Genomic characterization of a global Corylus avellana L. collection: insights into hazelnut ancestry and genetic determinants of production traits.BMC plant biology · 2025Article
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- TaHSP18.6 and TaSRT1 interact to confer resistance toProceedings of the National Academy of Sciences of the United States of America · 2025Article
- Molecular Networks Governing Plant Responses to Heat and Cold Stress.Plants (Basel, Switzerland) · 2025Review
- OsHsp20-25, a small heat shock protein, from long-lived mRNA regulates seed size and germination rate in rice.Planta · 2025Article
- Stress resilience in plants: the complex interplay between heat stress memory and resetting.The New phytologist · 2025Review
- Cooperative condensation of RNA-DIRECTED DNA METHYLATION 16 splicing isoforms enhances heat tolerance in Arabidopsis.Nature communications · 2025Article
- Comparative chloroplast genome analysis of Ardisia (Myrsinoideae, Primulaceae) in China and implications for phylogenetic relationships and adaptive evolution.BMC plant biology · 2024Article
- Overexpression of SlATG8f gene enhanced autophagy and pollen protection in tomato under heat stress.Scientific reports · 2024Article
- Comprehensive molecular evolutionary analysis of small heat shock proteins in five diploid Gossypium species.The plant genome · 2024Article
- Transcriptomic Analyses Reveal ThatInternational journal of molecular sciences · 2024Article
- Genome-Wide Identification and Characterization ofPlants (Basel, Switzerland) · 2024Article
- Bioinformatic Analysis of Codon Usage Bias of HSP20 Genes in Four Cruciferous Species.Plants (Basel, Switzerland) · 2024Article
- Genome-wide identification and expression analysis of heat shock protein gene family in cassava.The plant genome · 2023Article
- A subfamily of the small heat shock proteins of the marine red alga Neopyropia yezoensis localizes in the chloroplast.Cell stress & chaperones · 2023Article
39 more citing papers are in PubMed but not listed here.
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9 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Compared with small heat shock proteins (sHSPs) in other organisms, those in plants are the most abundant and diverse. However, the molecular mechanisms by which sHSPs are involved in cell protection remain unknown. Here, we characterized the role of HSP21, a plastid nucleoid-localized sHSP, in chloroplast development under heat stress. We show that an Arabidopsis thaliana knockout mutant of HSP21 had an ivory phenotype under heat stress. Quantitative real-time RT-PCR, run-on transcription, RNA gel blot, and polysome association analyses demonstrated that HSP21 is involved in plastid-encoded RNA polymerase (PEP)-dependent transcription. We found that the plastid nucleoid protein pTAC5 was an HSP21 target. pTAC5 has a C4-type zinc finger similar to that of Escherichia coli DnaJ and zinc-dependent disulfide isomerase activity. Reduction of pTAC5 expression by RNA interference led to similar phenotypic effects as observed in hsp21. HSP21 and pTAC5 formed a complex that was associated mainly with the PEP complex. HSP21 and pTAC5 were associated with the PEP complex not only during transcription initiation, but also during elongation and termination. Our results suggest that HSP21 and pTAC5 are required for chloroplast development under heat stress by maintaining PEP function.
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