Crystal structures of a stabilized β1-adrenoceptor bound to the biased agonists bucindolol and carvedilol.

Structure
Tony WarneChristopher G Tate

Abstract

The β(1)-adrenoceptor (β(1)AR) is the site of action of beta blockers used in the treatment of cardiac-related illnesses. Two beta blockers, carvedilol and bucindolol, show distinctive activities compared to other beta blockers and have been proposed as treatments tailored to the Arg/Gly389(8.56) polymorphism of the human β(1)AR. Both carvedilol and bucindolol are classified as biased agonists, because they stimulate G protein-independent signaling, while acting as either inverse or partial agonists of the G protein pathway. We have determined the crystal structures of a thermostabilized avian β(1)AR mutant bound to bucindolol and to carvedilol at 3.2 and 2.3 Å resolution, respectively. In comparison to other beta blockers, bucindolol and carvedilol interact with additional residues, in extracellular loop 2 and transmembrane helix 7, which may promote G protein-independent signaling. The structures also suggest that there may be a structural explanation for the pharmacological differences arising from the Arg/Gly389(8.56) polymorphism.

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Methods Mentioned

BETA
NMR

Software Mentioned

COOT
PHASER
MOLPROBITY
MOSFLM
SCALA
REFMAC5

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