MHCIbiopic · MHC-I biogenesis and degradation at the endoplasmic reticulum membrane
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2019-02-01 → 2021-01-31
- EU contribution
- €165,599
- Participants
- 1
- Scheme
- MSCA-IF-EF-ST
Lines connect the coordinator with its partners.
Results in brief
MHC-I biogenesis and degradation at the endoplasmic reticulum membrane
One third of the proteins of a human cell are synthetized and degraded at the membrane of a cellular compartment called the Endoplamsic Reticulum (ER). Dysfunction of these processes generate a stress on this compartment which is prevalent in diseases like Parkinson and Alzheimer diseases, diabetes, liver diseases and some cancers. However, because these processes occur at a membrane, they are particularly tedious to reconstitute and study in vitro and we currently lack detailed structural and mechanistic understanding of these crucial events. The objective of this project was to use a microscopy technique called Cryo Electron Tomography (CET) on isolated ER to image some of these ER processes and provide new molecular details on their mechanism.
Data: CORDIS, © European Union
Project objective
One third of the cell proteome utilizes the secretory pathway for entrance into the endoplasmic reticulum (ER). However, the insertion of nascent proteins into or their translocation across the ER membrane, their maturation and assembly to oligomeric complexes and their degradation are very basic cellular processes of which we largely lack an integrative structural insight.I propose to use Cryo Electron Tomography (CET) to unravel the molecular mechanism of the biogenesis and degradation of Major Histocompatibility Complex-I (MHC-I) as a model substrate in situ. MHC-I are critical for immune responses to viruses and tumors. They are hetero-trimeric complexes formed by a light chain, a heavy chain and a variable cellular or microbial peptide. MHC-I folding is assisted by the chaperones ERp57 and calnexin at the ER membrane, where it assembles co-translationally, stabilized by tapasin. Once loaded with a peptide, MHC-I is exported to the cell surface for recognition by CD8+ T-cells. However, some viral immunoevasins like the human cytomegalovirus (HCMV) proteins US2 and US11 trigger the ER-Associated Degradation (ERAD) of MHC-I. I will combine data from CET, cross linking mass spectrometry (XL-MS) and in vitro functional assays on eukaryotic cellular and microsomal cell-free systems to provide an integrated picture of the complexes transiently involved in these processes.This work will make great contributions to our molecular understanding of cellular proteostasis and possibly provide novel molecular targets addressing diseases associated with ER stress.The proposed project will extend my knowledge from protein X-ray crystallography to the study of more complex molecular assemblies in association with membranes at larger length scales – ultimately the cell. Taken together, this project represents a unique opportunity to start blooming in my career as an independent researcher with a strong european network, and become a leader in the scientific community.
Original text from CORDIS.
Participants
- UNIVERSITEIT UTRECHT · UtrechtCoordinatorNetherlands
Links
Data: CORDIS, © European Union