Functions of plastid protein import and the ubiquitin-proteasome system in plastid development

Biochimica Et Biophysica Acta
Qihua Ling, P Jarvis

Abstract

Plastids, such as chloroplasts, are widely distributed endosymbiotic organelles in plants and algae. Apart from their well-known functions in photosynthesis, they have roles in processes as diverse as signal sensing, fruit ripening, and seed development. As most plastid proteins are produced in the cytosol, plastids have developed dedicated translocon machineries for protein import, comprising the TOC (translocon at the outer envelope membrane of chloroplasts) and TIC (translocon at the inner envelope membrane of chloroplasts) complexes. Multiple lines of evidence reveal that protein import via the TOC complex is actively regulated, based on the specific interplay between distinct receptor isoforms and diverse client proteins. In this review, we summarize recent advances in our understanding of protein import regulation, particularly in relation to control by the ubiquitin-proteasome system (UPS), and how such regulation changes plastid development. The diversity of plastid import receptors (and of corresponding preprotein substrates) has a determining role in plastid differentiation and interconversion. The controllable turnover of TOC components by the UPS influences the developmental fate of plastids, which is fundamentally ...Continue Reading

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Citations

Jan 15, 2016·Current Biology : CB·Qihua Ling, Paul Jarvis
Jan 24, 2015·Biochimica Et Biophysica Acta·Anna RastJörg Nickelsen
Jun 27, 2015·Biochimica Et Biophysica Acta·Lixin Zhang
Jun 6, 2019·Plant Cell Reports·Inhwan Hwang
Jan 11, 2020·Biochemical Society Transactions·Simon M ThomsonR Paul Jarvis
Apr 1, 2017·Frontiers in Plant Science·Yoshihiro HirosawaTakehito Inaba
Jun 30, 2021·Journal of Experimental Botany·Mastoureh SedaghatmehrSalma Balazadeh

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