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Topology of the morphological domains of the chaperonin GroEL visualized by immuno-electron microscopy

J Martin1, K N Goldie, A Engel

  • 1Cellular Biochemistry & Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.

Biological Chemistry Hoppe-Seyler
|September 1, 1994
PubMed

Insights

The study maps the structural domains of the GroEL chaperonin complex using immuno-electron microscopy. Antibodies reveal the arrangement of the C40 and N15 domains within the GroEL subunits.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • GroEL is a tetradecameric double-ring complex essential for protein folding.
  • Its subunits (58 kDa) possess two distinct morphological domains.

Purpose of the Study:

  • To structurally map the two major domains of GroEL subunits within the complex.
  • To determine the arrangement of these domains and their relation to function.

Main Methods:

  • Immuno-electron microscopy was employed to localize GroEL domains.
  • Chemical modification and protease treatment generated N15 (1-141) and C40 (153-531) fragments.
  • Scanning transmission electron microscopy visualized antibody-protein interactions.

Main Results:

  • GroEL subunits exhibit a four-layered structure.
  • Antibodies against C40 recognized outer layers; antibodies against N15 targeted equatorial regions.
  • The domain arrangement within GroEL subunits is C40-N15:N15-C40.
  • GroES interacts with the C40 domain; ATP-binding sites are near the N15-C40 junction.

Conclusions:

  • The study elucidates the precise arrangement of GroEL subunit domains.
  • This structural information provides insights into GroEL-GroES and ATP-binding site interactions.
  • The findings contribute to understanding the mechanism of this essential molecular chaperone.

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