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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Br+J+Pharmacol
2014 ; 171
(24
): 5774-89
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Structural basis for constitutive activity and agonist-induced activation of the
enteroendocrine fat sensor GPR119
#MMPMID25117266
Engelstoft MS
; Norn C
; Hauge M
; Holliday ND
; Elster L
; Lehmann J
; Jones RM
; Frimurer TM
; Schwartz TW
Br J Pharmacol
2014[Dec]; 171
(24
): 5774-89
PMID25117266
show ga
BACKGROUND AND PURPOSE: GPR119 is a G?s-coupled 7TM receptor activated by
endogenous lipids such as oleoylethanolamide (OEA) and by the dietary
triglyceride metabolite 2-monoacylglycerol. GPR119 stimulates enteroendocrine
hormone and insulin secretion. But despite massive drug discovery efforts in the
field, very little is known about the basic molecular pharmacology of GPR119.
EXPERIMENTAL APPROACH: GPR119 receptor signalling was studied in transfected
cells. Mutational mapping (30 mutations in 23 positions) was performed on
residues required for ligand-independent and agonist-induced GPR119 activation
(AR231453 and OEA). Novel Rosetta-based receptor modelling was applied, using a
composite template approach with segments from different X-ray structures and
fully flexible ligand docking. KEY RESULTS: The increased signalling induced by
increasing the cell surface expression of GPR119 in the absence of agonist and
the inhibitory effect of two synthetic inverse agonists demonstrated that GRP119
signals with a high degree of constitutive activity through the G?s pathway. The
mutational maps for AR231453 and OEA were very similar and, surprisingly, also
similar to the mutational map for residues affecting the constitutive signalling
- albeit with key differences. Surprisingly, almost all residues in extracellular
loop-2b were important for the constitutive activity. The molecular modelling and
docking demonstrated that AR231453 binds in a 'vertical' pocket in between
mutational hits reaching from the centre of the receptor out to extracellular
loop-2b. CONCLUSIONS AND IMPLICATIONS: The high constitutive activity of GPR119
should be taken into account in future drug discovery efforts, which can now be
guided by the detailed knowledge of the physiochemical properties of the extended
ligand-binding pocket.