RT Journal Article
SR Electronic
T1 Organ-specific quality control of plant peroxisomes is mediated by autophagy
JF Journal of Cell Science
JO J. Cell Sci.
FD The Company of Biologists Ltd
SP 1161
OP 1168
DO 10.1242/jcs.139709
VO 127
IS 6
A1 Yoshimoto, Kohki
A1 Shibata, Michitaro
A1 Kondo, Maki
A1 Oikawa, Kazusato
A1 Sato, Mayuko
A1 Toyooka, Kiminori
A1 Shirasu, Ken
A1 Nishimura, Mikio
A1 Ohsumi, Yoshinori
YR 2014
UL http://jcs.biologists.org/content/127/6/1161.abstract
AB Peroxisomes are essential organelles that are characterized by the possession of enzymes that produce hydrogen peroxide (H2O2) as part of their normal catalytic cycle. During the metabolic process, peroxisomal proteins are inevitably damaged by H2O2 and the integrity of the peroxisomes is impaired. Here, we show that autophagy, an intracellular process for vacuolar degradation, selectively degrades dysfunctional peroxisomes. Marked accumulation of peroxisomes was observed in the leaves but not roots of autophagy-related (ATG)-knockout Arabidopsis thaliana mutants. The peroxisomes in leaf cells contained markedly increased levels of catalase in an insoluble and inactive aggregate form. The chemically inducible complementation system in ATG5-knockout Arabidopsis provided the evidence that these accumulated peroxisomes were delivered to vacuoles for degradation by autophagy. Interestingly, autophagosomal membrane structures specifically recognized the abnormal peroxisomes at the site of the aggregates. Thus, autophagy is essential for the quality control of peroxisomes in leaves and for proper plant development under natural growth conditions.