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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
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Functional reconstruction of a eukaryotic-like E1/E2/(RING) E3 ubiquitylation cascade from an uncultured archaeon
Rory Hennell James1, Eva F Caceres2, Alex Escasinas3
1Department of Biochemistry, The University of Cambridge, Cambridge, CB2 1GA, UK.
Nature Communications
|October 26, 2017
Summary
Researchers found that archaeal proteins from Candidatus
Area of Science:
- Evolutionary biology
- Molecular biology
- Biochemistry
Background:
- Ubiquitin modification regulates key biological functions.
- The evolution of complex eukaryotic ubiquitylation systems from prokaryotic ancestors remains unclear.
- Archaeal ubiquitin-like modifiers offer insights into this evolutionary question.
Purpose of the Study:
- To investigate the evolutionary origins of eukaryotic ubiquitylation systems.
- To determine if archaeal proteins can function as a ubiquitin modification system.
- To support the hypothesis of an archaeal ancestor for eukaryotic ubiquitylation.
Main Methods:
- Investigated proteins from the archaeon Candidatus 'Caldiarchaeum subterraneum'.
- Examined the function of ubiquitin, E1-like, E2-like, and small-RING finger (srfp) proteins.
- Analyzed the sequential ubiquitylation cascade mediated by these archaeal proteins.
Main Results:
- Archaeal proteins from Candidatus 'Caldiarchaeum subterraneum' form a functional ubiquitin modification system.
- These proteins mediate a sequential ubiquitylation cascade similar to eukaryotic systems.
- The discovered archaeal system resembles the progenitor apparatus of eukaryotic ubiquitylation.
Conclusions:
- Complex eukaryotic ubiquitylation pathways likely evolved from simpler archaeal systems.
- This study provides evidence for the inheritance of ubiquitylation systems from an archaeal ancestor.
- The findings clarify the evolutionary trajectory of essential biological regulatory mechanisms.
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