Activation of G Protein-Coupled Receptors and Heterotrimeric G Proteins.
dc.contributor.author | DeVree, Brian Thomas | en_US |
dc.date.accessioned | 2013-09-24T16:01:50Z | |
dc.date.available | NO_RESTRICTION | en_US |
dc.date.available | 2013-09-24T16:01:50Z | |
dc.date.issued | 2013 | en_US |
dc.date.submitted | 2013 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/99848 | |
dc.description.abstract | G protein-coupled receptors (GPCRs) are an important class of cell-surface transmembrane receptors that pass an activation signal to the interior of the cell through heterotrimeric G proteins. In this work, we study the human beta-2-adrenergic receptor (B2AR) and stimulatory G protein (Gs) as examples in order to understand the molecular basis of this signal transfer event. We solved a 3.2 angstrom crystal structure of B2AR and Gs in a nucleotide-free, intermediate signaling complex, revealing the interaction between the proteins at atomic resolution. The structure was consistent with previous biochemical knowledge, but also revealed several previously unknown features of the activation process. We used deuterium/hydrogen exchange and electron microscopy in order to find regions in the complex that change conformation during the activation process. These regions are highly conserved within the GPCR and G protein families, and his work shows the central role that they play in the process of GPCR signal transduction. The binding of drugs to the receptor in the fully activated state, as seen in the B2AR-Gs complex, was also characterized by radioligand and antibody fragment binding. A full kinetic model was developed for drug binding to the activated receptor which demonstrated how the ligand is held very tightly in the receptor binding pocket. This tight ligand binding can be relieved by the addition of GDP, demonstrating a direct allosteric link between the G protein nucleotide binding site and the receptor ligand binding site. Overall, this work demonstrates how the GPCR signal transduction machinery operates in high-resolution structural, kinetic, and pharmacological detail. It advances our understanding of how GPCRs and G proteins pass a signal across the cellular membrane. | en_US |
dc.language.iso | en_US | en_US |
dc.subject | G Protein-coupled Receptor | en_US |
dc.subject | Heterotrimeric G Protein | en_US |
dc.title | Activation of G Protein-Coupled Receptors and Heterotrimeric G Proteins. | en_US |
dc.type | Thesis | en_US |
dc.description.thesisdegreename | PhD | en_US |
dc.description.thesisdegreediscipline | Chemical Biology | en_US |
dc.description.thesisdegreegrantor | University of Michigan, Horace H. Rackham School of Graduate Studies | en_US |
dc.contributor.committeemember | Sunahara, Roger K. | en_US |
dc.contributor.committeemember | Neubig, Richard Robert | en_US |
dc.contributor.committeemember | Brooks Iii, Charles L. | en_US |
dc.contributor.committeemember | Gestwicki, Jason E. | en_US |
dc.subject.hlbsecondlevel | Biological Chemistry | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/99848/1/btdevree_1.pdf | |
dc.owningcollname | Dissertations and Theses (Ph.D. and Master's) |
Files in this item
Remediation of Harmful Language
The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.
Accessibility
If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.