ERdj3B-mediated quality control maintains anther development at high temperatures

Masaya Yamamoto, Shuhei Uji, Tomoyuki Sugiyama, Tomoaki Sakamoto, Seisuke Kimura, Toshiya Endo, Shuh Ichi Nishikawa

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)


    Pollen development is highly sensitive to heat stress, which impairs cellular proteostasis by causing misfolded proteins to accumulate. Therefore, each cellular compartment possesses a dedicated protein quality control system. An elaborate quality control system involving molecular chaperones, including immunoglobulin-binding protein (BiP), heat shock protein70, and regulatory J domain-containing cochaperones (J proteins), allows the endoplasmic reticulum (ER) to withstand a large influx of proteins. Here, we found that Arabidopsis (Arabidopsis thaliana) mutants of ER-localized DnaJ family 3B (ERdj3B), one of three ER-resident J proteins involved in ER quality control, produced few seeds at high temperatures (29°C) due to defects in anther development. This temperature-sensitive fertility defect is specific to the defective interactions of BiP with ERdj3B but not with the other two J proteins, indicating functional differences between ERdj3B and the other J proteins. RNA sequencing analysis revealed that heat stress affects pollen development in both wild-type and mutant buds, but the erdj3b mutant is more susceptible, possibly due to defects in ER quality control. Our results highlight the importance of a specific ER quality control factor, ERdj3B, for plant reproduction, particularly anther development, at high temperatures.

    Original languageEnglish
    Pages (from-to)1979-1990
    Number of pages12
    JournalPlant physiology
    Issue number4
    Publication statusPublished - 2020 Apr

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science


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