High-resolution structure of a membrane protein transferred from amphipol to a lipidic mesophase.
J Membr Biol
; 247(9-10): 997-1004, 2014 10.
Article
em En
| MEDLINE
| ID: mdl-25192977
ABSTRACT
Amphipols (APols) have become important tools for the stabilization, folding, and in vitro structural and functional studies of membrane proteins (MPs). Direct crystallization of MPs solubilized in APols would be of high importance for structural biology. However, despite considerable efforts, it is still not clear whether MP/APol complexes can form well-ordered crystals suitable for X-ray crystallography. In the present work, we show that an APol-trapped MP can be crystallized in meso. Bacteriorhodopsin (BR) trapped by APol A8-35 was mixed with a lipidic mesophase, and crystallization was induced by adding a precipitant. The crystals diffract beyond 2 Å. The structure of BR was solved to 2 Å and found to be indistinguishable from previous structures obtained after transfer from detergent solutions. We suggest the proposed protocol of in meso crystallization to be generally applicable to APol-trapped MPs.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polímeros
/
Propilaminas
/
Tensoativos
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Bacteriorodopsinas
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Cristalização
/
Bicamadas Lipídicas
/
Proteínas de Membrana
Idioma:
En
Revista:
J Membr Biol
Ano de publicação:
2014
Tipo de documento:
Article