Senescence-associated degradation of chloroplast proteins inside and outside the organelle

Plant Biology
Dana E MartínezJuan J Guiamet

Abstract

Leaf proteins, and in particular the photosynthetic proteins of plastids, are extensively degraded during senescence. Although this involves massive amounts of protein, the mechanisms responsible for chloroplast protein degradation are largely unknown. Degradation within the plastid itself is supported by the observation that chloroplasts contain active proteases, and that chloroplasts isolated from senescing leaves can cleave Rubisco to release partially digested fragments. It is less clear whether chloroplasts can complete Rubisco degradation. Chloroplastic proteases are likely involved in the breakdown of the D1 and LHCII proteins of photosystem II. Small senescence-associated vacuoles (SAVs) with high-proteolytic activity develop in senescing leaf cells, and there is evidence that SAVs contain chloroplast proteins. Thus, an extra-plastidic pathway involving SAVs might participate in the degradation of some chloroplast proteins. Plastidic and extra-plastidic pathways might cooperate in the degradation of chloroplast proteins, or they might represent alternative, redundant pathways for photosynthetic protein degradation.

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Citations

Oct 31, 2012·International Journal of Molecular Sciences·Kirsten KrauseKarin Krupinska
Nov 29, 2011·Yi chuan = Hereditas·Mao LuoGuang-Tang Pan
Mar 20, 2016·Plant Science : an International Journal of Experimental Plant Biology·Marine PoretJean-Christophe Avice
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Jun 3, 2015·Journal of Integrative Plant Biology·Shunhua DingCongming Lu
Sep 11, 2010·Plant Physiology and Biochemistry : PPB·Hiroshi FukayamaNaotsugu Uchida
Jun 20, 2008·The Plant Journal : for Cell and Molecular Biology·Dana E MartínezJuan J Guiamet
Sep 20, 2008·Plant Biology·K Krupinska, K Humbeck
Sep 20, 2008·Plant Biology·P L GregersenK Krupinska
Dec 24, 2009·Physiologia Plantarum·Pranab Kishor MohapatraBasanti Biswal
Jan 7, 2010·Physiologia Plantarum·Eloísa AgüeraPurificación de la Haba
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Jul 11, 2014·Frontiers in Plant Science·Chenxia RenQingqiu Gong
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Aug 10, 2016·Genetics and Molecular Biology·Mercedes Diaz-MendozaIsabel Diaz
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Jul 8, 2020·International Journal of Molecular Sciences·Zhuanzhuan JiangXin Hou
Dec 17, 2011·Plant, Cell & Environment·Bastiaan BrouwerPer Gardeström
Apr 2, 2021·Frontiers in Plant Science·Ewelina Paluch-LubawaEwa Sobieszczuk-Nowicka

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