Membrane cholesterol depletion reduces downstream signaling activity of the adenosine A2A receptor.
Biochim Biophys Acta Biomembr
; 1861(4): 760-767, 2019 04 01.
Article
en En
| MEDLINE
| ID: mdl-30629951
ABSTRACT
Cholesterol has been shown to modulate the activity of multiple G Protein-coupled receptors (GPCRs), yet whether cholesterol acts through specific interactions, indirectly via modifications to the membrane, or via both mechanisms is not well understood. High-resolution crystal structures of GPCRs have identified bound cholesterols; based on a ß2-adrenergic receptor (ß2AR) structure bound to cholesterol and the presence of conserved amino acids in class A receptors, the cholesterol consensus motif (CCM) was identified. Here in mammalian cells expressing the adenosine A2A receptor (A2AR), ligand dependent production of cAMP is reduced following membrane cholesterol depletion with methyl-beta-cyclodextrin (MßCD), indicating that A2AR signaling is dependent on cholesterol. In contrast, ligand binding is not dependent on cholesterol depletion. All-atom molecular simulations suggest that cholesterol interacts specifically with the CCM when the receptor is in an active state, but not when in an inactive state. Taken together, the data support a model of receptor state-dependent binding between cholesterol and the CCM, which could facilitate both G-protein coupling and downstream signaling of A2AR.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Transducción de Señal
/
Resina de Colestiramina
/
Receptor de Adenosina A2A
/
Simulación de Dinámica Molecular
Límite:
Humans
Idioma:
En
Revista:
Biochim Biophys Acta Biomembr
Año:
2019
Tipo del documento:
Article
País de afiliación:
Estados Unidos