Selective contrast in electron microscopy of crystalline cytochrome oxidase


Journal Article

We have used various techniques for preparation of specimens for electron microscopy in order to selectively contrast different regions of vesicle crystals of cytochrome c oxidase dimers. The results are consistent with a dimer composed of two y-shaped monomers [Fuller et al., J. Mol. Biol. 134 (1979) 305] aligned along one pair of arms with the other pair of arms approximately 70 Å apart. The four arms of the monomers lie within and perpendicular to the lipid bilayer in which the dimer is embedded, and the arms protrude approximately 25 Å from the lipid bilayer on the matrix side of the membrane. The cytoplasmic side domains of the two monomers split away from one another forming a large cleft in the dimer. Monovalent antibodies (Fab fragments) to subunit IV appear to bind to the two monomer arms which are closely apposed across the two-fold axis of the dimer.

Full Text

Duke Authors

Cited Authors

  • Frey, TG; Costello, MJ; Chan, SHP

Published Date

  • January 1, 1984

Published In

Volume / Issue

  • 13 / 1-2

Start / End Page

  • 85 - 91

International Standard Serial Number (ISSN)

  • 0304-3991

Digital Object Identifier (DOI)

  • 10.1016/0304-3991(84)90059-7

Citation Source

  • Scopus