Structure Determination of G Protein Coupled Receptor
Description
G protein coupled receptors (GPCRs) mediate various of physiologicalactivities which makes them significant drug targets. Determination of atomic level
structure of GPCRs facilitates the structure-based drug design. The most widely
used method currently for solving GPCR structure is still protein crystallography
especially lipidic cubic phase (LCP) crystallization. LCP could mimic the native
environment of membrane protein which stable the membrane proteins. Traditional
synchrotron source requires large size large size protein crystals (>30 micron) due to
the radiation damage during data collection. However, acquiring large sized protein
crystals is challenging and not guaranteed practically. In this study, a novel method
was developed which combined LCP technology and micro-electron diffraction
(MicroED) technology. LCP-MicroED technology was able to collect complete
diffraction data sets from serval submicron protein crystals and deliver high
resolution protein structures. This technology was first confirmed with soluble
protein crystals, proteinase K and small molecule crystals, cholesterol. Furthermore,
this novel method was applied to a human GPCR target, Î22- adrenergic receptor
(Î22AR). The structure model was successfully built which proved the feasibility of
applying LCP-MicroED method to GPCRs and other membrane proteins. Besides, in
this research, a novel human GPCR target, human histamine 4 receptor(H4R) was
studied. Different constructs were expressed, purified, and characterized. Some key
residuals that affect ligand binding were confirmed.
Date Created
The date the item was original created (prior to any relationship with the ASU Digital Repositories.)
2022
Agent
- Author (aut): Jing, Liang
- Thesis advisor (ths): Mazor, Yuval
- Committee member: Mills, Jeremy
- Committee member: Wang, Xu
- Publisher (pbl): Arizona State University