LAT1 (SLC7A5) and CD98hc (SLC3A2) complex dynamics revealed by single-particle cryo-EM.
Acta Crystallogr D Struct Biol
; 75(Pt 7): 660-669, 2019 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-31282475
ABSTRACT
Solute carriers are a large class of transporters that play key roles in normal and disease physiology. Among the solute carriers, heteromeric amino-acid transporters (HATs) are unique in their quaternary structure. LAT1-CD98hc, a HAT, transports essential amino acids and drugs across the blood-brain barrier and into cancer cells. It is therefore an important target both biologically and therapeutically. During the course of this work, cryo-EM structures of LAT1-CD98hc in the inward-facing conformation and in either the substrate-bound or apo states were reported to 3.3-3.5â
Å resolution [Yan et al. (2019), Nature (London), 568, 127-130]. Here, these structures are analyzed together with our lower resolution cryo-EM structure, and multibody 3D auto-refinement against single-particle cryo-EM data was used to characterize the dynamics of the interaction of CD98hc and LAT1. It is shown that the CD98hc ectodomain and the LAT1 extracellular surface share no substantial interface. This allows the CD98hc ectodomain to have a high degree of movement within the extracellular space. The functional implications of these aspects are discussed together with the structure determination.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cadeia Pesada da Proteína-1 Reguladora de Fusão
/
Transportador 1 de Aminoácidos Neutros Grandes
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Domínios e Motivos de Interação entre Proteínas
Limite:
Humans
Idioma:
En
Revista:
Acta Crystallogr D Struct Biol
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Reino Unido