This is the first time an epigenetic signal has been shown to
impact ubiquitylation and connects the patterns of epigenetic information in a new way.
Proteolysis in Cell Cycle and Cell Fate Decisions:
How Ubiquitylation Coordinates Proliferation and Differentiation
The latest publication of the Robinson - lab (Lancaster University, UK) in collaboration with the Ettema - lab is now available online at Nature Communications, regarding the «Functional reconstruction of a eukaryotic - like E1 / E2 / (RING)
E3 ubiquitylation cascade from an uncultured archaeon» — the first time that the ubiquitination cascade has been demonstrated outside of eukaryotes.
Targeting of HIF - α to the von Hippel -
Lindau ubiquitylation complex by O2 - regulated prolyl hydroxylation.
Decreased mTORC1 activation and subsequent decreases in muscle protein synthesis, coupled with increased FOXO nuclear localization, increased transcription of atrophy - related genes, with up - regulated caspase 3 activation and muscle
protein ubiquitylation provide a possible mechanism contributing to skeletal muscle loss in response to periods of negative energy balance.
A protein that is inactive in the absence of additional modification (s), such as phosphorylation or
ubiquitylation.
As such, it appears that the insulin / IGF - PI 3K pathway not only regulates myofibrillar cleavage through caspase 3, but also
the ubiquitylation of the resulting protein fragments via modification of ubiquitin - ligase expression.