Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 65, Issue 14, Pages 3825-3833Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eru043
Keywords
Cystatin; cysteine protease; leaf senescence; nutrient recycling; protein breakdown; proteolysis
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Funding
- Ministerio de Economia y Competitividad of Spain [AGL2011-23650]
- European Commission FP7 Marie Curie action CoFund programme [2012-2015]
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Senescence-associated proteolysis in plants is a crucial process to relocalize nutrients from leaves to growing or storage tissues. The massive net degradation of proteins involves broad metabolic networks, different subcellular compartments, and several types of proteases and regulators. C1A cysteine proteases, grouped as cathepsin L-, B-, H-, and F-like according to their gene structures and phylogenetic relationships, are the most abundant enzymes responsible for the proteolytic activity during leaf senescence. Besides, cystatins as specific modulators of C1A peptidase activities exert a complex regulatory role in this physiological process. This overview article covers the most recent information on C1A proteases in leaf senescence in different plant species. Particularly, it is focussed on barley, as the unique species where the whole gene family members of C1A cysteine proteases and cystatins have been analysed.
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