Protein crystal structure obtained at 2.9 Å resolution from injecting bacterial cells into an X-ray free-electron laser beam.
Proc Natl Acad Sci U S A
; 111(35): 12769-74, 2014 Sep 02.
Article
em En
| MEDLINE
| ID: mdl-25136092
ABSTRACT
It has long been known that toxins produced by Bacillus thuringiensis (Bt) are stored in the bacterial cells in crystalline form. Here we describe the structure determination of the Cry3A toxin found naturally crystallized within Bt cells. When whole Bt cells were streamed into an X-ray free-electron laser beam we found that scattering from other cell components did not obscure diffraction from the crystals. The resolution limits of the best diffraction images collected from cells were the same as from isolated crystals. The integrity of the cells at the moment of diffraction is unclear; however, given the short time (â¼ 5 µs) between exiting the injector to intersecting with the X-ray beam, our result is a 2.9-Å-resolution structure of a crystalline protein as it exists in a living cell. The study suggests that authentic in vivo diffraction studies can produce atomic-level structural information.
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MEDLINE
Assunto principal:
Esporos Bacterianos
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Bacillus thuringiensis
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Proteínas de Bactérias
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Cristalografia por Raios X
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Endotoxinas
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Proteínas Hemolisinas
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article