The helical propensity of the extracellular loop is responsible for the substrate specificity of Fe(III)-phytosiderophore transporters.
FEBS Lett
; 590(24): 4617-4627, 2016 Dec.
Article
en En
| MEDLINE
| ID: mdl-27861811
Hordeum vulgare L. yellow stripe 1 (HvYS1) is a selective transporter of Fe(III)-phytosiderophores in barley that is responsible for iron acquisition from the soil. In contrast, maize Zea mays, yellow stripe 1 (ZmYS1) possesses broad substrate specificity. In this study, a quantitative evaluation of the transport activities of HvYS1 and ZmYS1 chimera proteins revealed that the seventh extracellular membrane loop is essential for substrate specificity. The loop peptides of both transporters were prepared and analysed by circular dichroism and NMR. The spectra revealed a higher propensity for α-helical conformation of the HvYS1 loop peptide and a largely disordered structure for that of ZmYS1. These structural differences are potentially responsible for the substrate specificities of the transporters.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas de Transporte de Membrana
/
Proteínas de Plantas
/
Hordeum
/
Sideróforos
/
Regulación de la Expresión Génica de las Plantas
/
Zea mays
/
Hierro
Límite:
Animals
Idioma:
En
Revista:
FEBS Lett
Año:
2016
Tipo del documento:
Article
País de afiliación:
Japón
Pais de publicación:
Reino Unido