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| Open AccessRETRACTED ARTICLE:The Arabidopsis NOT4A E3 ligase promotes PGR3 expression and regulates chloroplast translation
NOT4 proteins associate with ribosomes and are required for co-translational quality control in yeast and animals. Here, Bailey et al. show that Arabidopsis NOT4A positively regulates the expression of the nuclear encoded pentatricopeptide repeat (PPR) protein PGR3 and is required for ribosome biogenesis and mRNA translation in the chloroplast.
- Mark Bailey
- , Aiste Ivanauskaite
- & Daniel J. Gibbs
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Article
| Open AccessMild proteasomal stress improves photosynthetic performance in Arabidopsis chloroplasts
Most chloroplast proteins are imported from the cytosol and thus transiently exposed to the cytosolic proteasome. Here the authors show that impairment of the cytosolic proteasome can elevate precursor protein abundance and photosynthetic activity suggesting that cytosolic protein turnover is a means to tune plastid function.
- Julia Grimmer
- , Stefan Helm
- & Sacha Baginsky
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Article
| Open AccessEthylene-mediated nitric oxide depletion pre-adapts plants to hypoxia stress
Plant hypoxia responses are controlled by oxygen and nitric oxide (NO)-dependent proteolysis of ERFVII transcription factors. Here Hartman et al. show that passive ethylene entrapment during root submergence enhances NO-scavenger PHYTOGLOBIN1, ERFVII stability and promotes subsequent hypoxia tolerance.
- Sjon Hartman
- , Zeguang Liu
- & Laurentius A. C. J. Voesenek
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Article
| Open AccessGIGANTEA recruits the UBP12 and UBP13 deubiquitylases to regulate accumulation of the ZTL photoreceptor complex
The daily accumulation of the ZEITLUPE (ZTL) photoreceptor/E3 ubiquitin ligase relies on a light-dependent interaction with GIGANTEA (GI). Here the authors show that GI recruits two deubiquitylases to help stabilize the ZTL-GI complex during the day and likely counterbalance the activity of ZTL.
- Chin-Mei Lee
- , Man-Wah Li
- & Joshua M. Gendron
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Article
| Open AccessPAWH1 and PAWH2 are plant-specific components of an Arabidopsis endoplasmic reticulum-associated degradation complex
Endoplasmic reticulum (ER)-associated degradation (ERAD) removes misfolded proteins from the secretory pathway. Here the authors identify two plant-specific proteins in Arabidopsis, PAWH1 and PAWH2, that bind to and stabilise the ER-anchored ubiquitin ligase Hrd1.
- Liangguang Lin
- , Congcong Zhang
- & Jianming Li
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Article
| Open AccessOxygen-dependent proteolysis regulates the stability of angiosperm polycomb repressive complex 2 subunit VERNALIZATION 2
VRN2 is a Polycomb Repressive Complex 2 subunit, best known as a regulator of vernalization that accumulates during prolonged cold. Here Gibbs et al. show that VRN2 is degraded via the N-end rule pathway, which prevents ectopic accumulation of VRN2 in the absence of appropriate environmental stimuli.
- Daniel J. Gibbs
- , Hannah M. Tedds
- & Michael J. Holdsworth
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Article
| Open AccessTyrosine phosphorylation of the GARU E3 ubiquitin ligase promotes gibberellin signalling by preventing GID1 degradation
Plants respond to gibberellins via GID1-dependent degradation of DELLA proteins. Here, Nemoto et al. show that the gibberellin response is positively regulated by tyrosine phosphorylation of GARU, an E3 ubiquitin ligase that mediates degradation of GID1.
- Keiichirou Nemoto
- , Abdelaziz Ramadan
- & Tatsuya Sawasaki