Title: Structural Determinants for Small-Molecule Activation of Skeletal Muscle AMPK alpha 2 beta 2 gamma 1 by the Glucose Importagog SC4
Authors: Ngoei, KRW
Langendorf, CG
Ling, NXY
Hoque, A
Varghese, S
Camerino, MA
Walker, SR
Bozikis, YE
Dite, TA
Ovens, AJ
Smiles, WJ
Jacobs, R
Huang, H
Parker, MW
Scott, JW
Rider, MH
Foitzik, RC
Kemp, BE
Baell, JB
Oakhill, JS
Issue Year: 2018
Publisher CELL PRESS
Series Cell Chem. Biol.:
Abstract The AMP-activated protein kinase (AMPK) alpha beta gamma het-erotrimer regulates cellular energy homeostasis with tissue-specific isoform distribution. Smallmolecule activation of skeletal muscle alpha 2 beta 2 AMPK complexes may prove a valuable treatment strategy for type 2 diabetes and insulin resistance. Herein, we report the small-molecule SC4 is a potent, direct AMPK activator that preferentially activates alpha 2 complexes and stimulates skeletal muscle glucose uptake. In parallel with the term secretagog, we propose "importagog" to define a substance that induces or augments cellular uptake of another substance. Three-dimensional structures of the glucose importagog SC4 bound to activated alpha 2 beta 2 gamma 1 and alpha 2 beta 1 gamma 1 complexes reveal binding determinants, in particular a key interaction between the SC4 imidazopyridine 4'-nitrogen and beta 2-Asp111, which provide a design paradigm for beta 2-AMPK therapeutics. The alpha 2 beta 2 gamma 1/SC4 structure reveals an interaction between a beta 2 N-terminal alpha helix and the alpha 2 autoinhibitory domain. Our results provide a structurefunction guide to accelerate development of potent, but importantly tissue-specific, beta 2-AMPK therapeutics.
URI: https://publications.svi.edu.au/publications/4467
Other Identifiers 10.1016/j.chembiol.2018.03.008
Publication type Article