A multi-step peptidolytic cascade for amino acid recovery in chloroplasts

October 31st, 2016 by Pedro F Teixeira

Nature Chemical Biology 13, 15 (2017). doi:10.1038/nchembio.2227

Authors: Pedro F Teixeira, Beata Kmiec, Rui M M Branca, Monika W Murcha, Anna Byzia, Aneta Ivanova, James Whelan, Marcin Drag, Janne Lehtiö & Elzbieta Glaser

Plastids (including chloroplasts) are subcellular sites for a plethora of proteolytic reactions, required in functions ranging from protein biogenesis to quality control. Here we show that peptides generated from pre-protein maturation within chloroplasts of Arabidopsis thaliana are degraded to amino acids by a multi-step peptidolytic cascade consisting of oligopeptidases and aminopeptidases, effectively allowing the recovery of single amino acids within these organelles.

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