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"Baehr, Craig M"
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Climate-Relevant Ocean Transport Measurements in the Atlantic and Arctic Oceans
Ocean circulation redistributes heat, freshwater, carbon, and nutrients all around the globe. Because of their importance in regulating climate, weather, extreme events, sea level, fisheries, and ecosystems, large-scale ocean currents should be monitored continuously. The Atlantic is unique as the only ocean basin where heat is, on average, transported northward in both hemispheres as part of the Atlantic Meridional Overturning Circulation (AMOC). The largely unrestricted connection with the Arctic and Southern Oceans allows ocean currents to exchange heat, freshwater, and other properties with polar latitudes.
Journal Article
Response of UBR-box E3 ubiquitin ligases and protein quality control pathways to perturbations in protein synthesis and skeletal muscle size
The N-degron pathway contributes to proteolysis by targeting N-terminal residues of destabilized proteins via E3 ligases that contain a UBR-box domain. Emerging evidence suggests the UBR-box family of E3 ubiquitin ligases (UBR1-7) are involved in the positive regulation of skeletal muscle mass. The purpose of this study was to explore the role of UBR-box E3 ubiquitin ligases under enhanced protein synthesis and skeletal muscle growth conditions. Cohorts of adult male mice were electroporated with constitutively active Akt (Akt-CA) or UBR5 RNAi constructs with a rapamycin diet intervention for 7 and 30 days, respectively. In addition, the UBR-box family was studied during the regrowth phase post nerve crush induced inactivity. Skeletal muscle growth with Akt-CA or regrowth following inactivity increased protein abundance of UBR1, UBR2, UBR4, UBR5 and UBR7. This occurred with corresponding increases in Akt-mTORC1/S6K and MAPK/p90RSK signaling and protein synthesis. The increases in UBR-box E3s, ubiquitination, and proteasomal activity occurred independently of mTORC1 activity and were associated with increases in markers related to autophagy, ER-stress, and protein quality control pathways. Finally, while UBR5 knockdown (KD) evokes atrophy, it occurs together with hyperactivation of mTORC1 and protein synthesis. In UBR5 KD muscles, we identified an increase in protein abundance for UBR2, UBR4 and UBR7, which may highlight a compensatory response to maintain proteome integrity. Future studies will seek to understand the role of UBR-box E3s towards protein quality control in skeletal muscle plasticity.
Journal Article