Abstract
Autophagy is an evolutionarily conserved intracellular process for the vacuolar degradation of cytoplasmic constituents. The central structures of this pathway are newly formed double-membrane vesicles (autophagosomes) that deliver excess or damaged cell components into the vacuole or lysosome for proteolytic degradation and monomer recycling. Cellular remodeling by autophagy allows organisms to survive extensive phases of nutrient starvation and exposure to abiotic and biotic stress. Autophagy was initially studied by electron microscopy in diverse organisms, followed by molecular and genetic analyses first in yeast and subsequently in mammals and plants. Experimental data demonstrate that the basic principles, mechanisms, and components characterized in yeast are conserved in mammals and plants to a large extent. However, distinct autophagy pathways appear to differ between kingdoms. Even though direct information remains scarce particularly for plants, the picture is emerging that the signal transduction cascades triggering autophagy and the mechanisms of organelle turnover evolved further in higher eukaryotes for optimization of nutrient recycling. Here, we summarize new research data on nitrogen starvation-induced signal transduction and organelle autophagy and integrate this knowledge into plant physiology.
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Abbreviations
- AMPK:
-
AMP-activated protein kinase
- ATG:
-
autophagy
- CAT:
-
catalase
- ConcA:
-
Concanamycin A
- Cvt:
-
cytoplasm-to-vacuole targeting
- DEHP:
-
di-(2-ethylhexyl)phthalate
- eIF2:
-
eukaryotic translation initiation factor-2
- ER:
-
endoplasmic reticulum
- FKBP12:
-
FK506-binding protein 12
- GCN2:
-
general control non-derepressible-2
- LBD:
-
lateral organ boundary domain
- 3-MA:
-
3-Methyladenine
- mex1:
-
maltose excess 1 mutant
- MIPA:
-
micropexophagy apparatus
- MAPK:
-
mitogen-activated protein kinase
- NLA:
-
nitrogen limitation adaptation mutant
- NLP:
-
nodule inception-like protein
- NR:
-
nitrate reductase
- PAS:
-
phagophore assembly site/preautophagosomal structure
- PCD:
-
programmed cell death
- PTS1:
-
peroxisome targeting signal type 1
- PEX:
-
peroxin
- PI3K:
-
phosphatidylinositol 3-kinase
- PI4P:
-
phosphatidylinositol 4′-monophosphate
- PMP:
-
peroxisomal membrane protein
- RAPTOR:
-
regulatory associated protein of mTOR
- RCB:
-
Rubisco-containing body
- SAV:
-
senescence-associated vacuole
- S6K:
-
S6 kinase
- SNFI:
-
sucrose non-fermenting kinase 1
- SNRK1:
-
SNF1/AMPK-related kinase
- TOR:
-
target of rapamycin
- TORC1/2:
-
TOR complex 1/2
- VPS:
-
vacuolar protein sorting
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Acknowledgments
We would like to thank Diane Bassham and the autophagy team of the Subramani laboratory (Andreas Till, Jean-Claude Farré, Taras Nazarko, Ravi Manjithaya, and Ronak Lakhani) for critical reading of the manuscript and valuable suggestions. The authors were supported by and acknowledge UiS funding (SR and CL) and funding from the Russian Foundation for Basic Research, grant #10-04-01186 (OV).
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The authors declare that they have no conflict of interest.
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Reumann, S., Voitsekhovskaja, O. & Lillo, C. From signal transduction to autophagy of plant cell organelles: lessons from yeast and mammals and plant-specific features. Protoplasma 247, 233–256 (2010). https://doi.org/10.1007/s00709-010-0190-0
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DOI: https://doi.org/10.1007/s00709-010-0190-0