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Metallothionein as a clonable high-density marker for cryo-electron microscopy.
Bouchet-Marquis, Cédric; Pagratis, Maria; Kirmse, Robert; Hoenger, Andreas.
Afiliación
  • Bouchet-Marquis C; Dept. of Molecular, Cellular and Developmental Biology, University of Colorado at Boulder, CO 80309-0347, USA.
J Struct Biol ; 177(1): 119-27, 2012 Jan.
Article en En | MEDLINE | ID: mdl-22068155
Cryo-electron microscopy is expanding its scope from macromolecules towards much larger and more complex cellular specimens such as organelles, cells and entire tissues. While isolated macromolecular specimens are typically composed of only very few different components that may be recognized by their shape, size or state of polymerization, cellular specimens combine large numbers of proteinaceous structures as well as nucleic acids and lipid arrays. Consequently, an unambiguous identification of these structures within the context of a whole cell may create a very difficult challenge. On plastic-embedded specimens, or Tokuyasu sections (Tokuyasu, 1980), epitopes that are exposed at the surface can be tagged by antibodies. However, vitrified sections have to be kept at strict cryo-conditions (below -140 °C) and therefore do not allow any post-sectioning treatment of the specimens other than data acquisition in the microscope. Hence, the labels have to be placed into the specimen before freezing. Here we report on the application of a small metal-clustering protein, metallothionein (MTH), as a clonable label capable of clustering metal atoms into a high-density particle with high spatial resolution. We tested MTH as a label for kinesin-decorated microtubules (MTs) as well as the building blocks of desmin intermediate filaments (IFs).
Asunto(s)

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Clonación Molecular / Microscopía por Crioelectrón / Metalotioneína Idioma: En Revista: J Struct Biol Asunto de la revista: BIOLOGIA MOLECULAR Año: 2012 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Clonación Molecular / Microscopía por Crioelectrón / Metalotioneína Idioma: En Revista: J Struct Biol Asunto de la revista: BIOLOGIA MOLECULAR Año: 2012 Tipo del documento: Article País de afiliación: Estados Unidos