SINAT E3 ligases regulate the stability of the ESCRT component FREE1 in response to iron deficiency in plants. Issue 9 (5th September 2020)

• Record Type: Journal Article
• Authors: Xiao, Zhidan; Yang, Chao; Liu, Chuanliang; Yang, Lianming; Yang, Shuhong; Zhou, Jun; Li, Faqiang; Jiang, Liwen; Xiao, Shi; Gao, Caiji; Shen, Wenjin
• Is Part Of: Journal of integrative plant biology. Volume 62:Issue 9(2020)
• Page Start: 1399
• Page End: 1417
• Publication Date: 2020-09-05
• Subjects: Plants -- Periodicals; Plants -- China -- Periodicals; Electronic journals; 580.5
• DOI: 10.1111/jipb.13005
• Languages: English
• ISSNs: 1672-9072

Abstract

Abstract: The endosomal sorting complex required for transport (ESCRT) machinery is an ancient, evolutionarily conserved membrane remodeling complex that is essential for multivesicular body (MVB) biogenesis in eukaryotes. FYVE DOMAIN PROTEIN REQUIRED FOR ENDOSOMAL SORTING 1 (FREE1), which was previously identified as a plant‐specific ESCRT component, modulates MVB‐mediated endosomal sorting and autophagic degradation. Although the basic cellular functions of FREE1 as an ESCRT component have been described, the regulators that control FREE1 turnover remain unknown. Here, we analyzed how FREE1 homeostasis is mediated by the RING‐finger E3 ubiquitin ligases, SINA of Arabidopsis thaliana (SINATs), in response to iron deficiency. Under iron‐deficient growth conditions, SINAT1‐4 were induced and ubiquitinated FREE1, thereby promoting its degradation and relieving the repressive effect of FREE1 on iron absorption. By contrast, SINAT5, another SINAT member that lacks ubiquitin ligase activity due to the absence of the RING domain, functions as a protector protein which stabilizes FREE1. Collectively, our findings uncover a hitherto unknown mechanism of homeostatic regulation of FREE1, and demonstrate a unique regulatory SINAT–FREE1 module that subtly regulates plant response to iron deficiency stress. Abstract : FREE1 is a plant‐specific protein essential for endosomal sorting, autophagic degradation and plant growth. FREE1 protein homeostasis is tightly regulated by the RING‐finger E3 ubiquitin ligases, SINA of Arabidopsis thaliana (SINATs), thereby relieving the repressive effect of FREE1 on metal absorption under iron deficient growth condition.