Structural basis of prostaglandin efflux by MRP4.
Nat Struct Mol Biol
; 31(4): 621-632, 2024 Apr.
Article
em En
| MEDLINE
| ID: mdl-38216659
ABSTRACT
Multidrug resistance protein 4 (MRP4) is a broadly expressed ATP-binding cassette transporter that is unique among the MRP subfamily for transporting prostanoids, a group of signaling molecules derived from unsaturated fatty acids. To better understand the basis of the substrate selectivity of MRP4, we used cryogenic-electron microscopy to determine six structures of nanodisc-reconstituted MRP4 at various stages throughout its transport cycle. Substrate-bound structures of MRP4 in complex with PGE1, PGE2 and the sulfonated-sterol DHEA-S reveal a common binding site that accommodates a diverse set of organic anions and suggest an allosteric mechanism for substrate-induced enhancement of MRP4 ATPase activity. Our structure of a catalytically compromised MRP4 mutant bound to ATP-Mg2+ is outward-occluded, a conformation previously unobserved in the MRP subfamily and consistent with an alternating-access transport mechanism. Our study provides insights into the endogenous function of this versatile efflux transporter and establishes a basis for MRP4-targeted drug design.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Prostaglandinas
/
Proteínas Associadas à Resistência a Múltiplos Medicamentos
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article