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김철민

Ghim, Cheol-Min
Physical Biology Biological Physics Lab.
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Cost-effective circadian mechanism: rhythmic degradation of circadian proteins spontaneously emerges without rhythmic post-translational regulation

Author(s)
Lim, RoktaekChae, JunghunSomers, David E.Kim, Pan-JunGhim, Cheol-Min
Issued Date
2021-07
DOI
10.1016/j.isci.2021.102726
URI
https://scholarworks.unist.ac.kr/handle/201301/53377
Fulltext
https://www.sciencedirect.com/science/article/pii/S2589004221006945?via%3Dihub
Citation
ISCIENCE, v.24, no.102726, pp.102726
Abstract
Circadian protein oscillations are maintained by the lifelong repetition of protein production and degradation in daily balance. It comes at the cost of ever-replayed, futile protein synthesis each day. This biosynthetic cost with a given oscillatory protein profile is relievable by a rhythmic, not constant, degradation rate that selectively peaks at the right time of day but remains low elsewhere, saving much of the gross protein loss and of the replenishing protein synthesis. Here, our mathematical modeling reveals that the rhythmic degradation rate of proteins with circadian production spontaneously emerges under steady and limited activity of proteolytic mediators and does not necessarily require rhythmic post-translational regulation of previous focus. Additional (yet steady) post-translational modifications in a proteolytic pathway can further facilitate the degradation's rhythmicity in favor of the biosynthetic cost saving. Our work is supported by animal and plant circadian data, offering a generic mechanism for potentially widespread, time-dependent protein turnover.
Publisher
CELL PRESS
ISSN
2589-0042
Keyword
CLOCKPHOSPHORYLATIONPROTEOMEPOLYUBIQUITYLATIONOSCILLATIONSTRANSLATION

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