Evidence for macromolecular protein rings in the absence of bulk water.
Science
; 310(5754): 1658-61, 2005 Dec 09.
Article
em En
| MEDLINE
| ID: mdl-16293722
ABSTRACT
We have examined the architecture of a protein complex in the absence of bulk water. By determining collision cross sections of assemblies of the trp RNA binding protein, TRAP, we established that the 11-membered ring topology of the complex can be maintained within a mass spectrometer. We also found that the binding of tryptophan enhances the stability of the ring structure and that addition of a specific RNA molecule increases the size of the complex and prevents structural collapse. These results provide definitive evidence that protein quaternary structure can be maintained in the absence of bulk water and highlight the potential of ion mobility separation for defining shapes of heterogeneous macromolecular assemblies.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Bactérias
/
Fatores de Transcrição
/
Água
/
Proteínas de Ligação a RNA
/
Estrutura Quaternária de Proteína
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article