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D-ribulose-1,5-bisphosphate carboxylase/oxygenase: function-dependent structural changes.

A Holzenburg1, F Mayer

  • 1Institut für Mikrobiologie der Georg-August-Universität Göttingen, F.R.G.

Electron Microscopy Reviews
|January 1, 1989
PubMed
Summary
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Structural analysis of D-ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) in Alcaligenes eutrophus H16 reveals significant configurational changes between its active, inactive, and transition states. These findings advance understanding of enzyme structure-function relationships.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • D-ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is crucial for carbon fixation in the reductive pentose phosphate cycle.
  • Understanding RuBisCO's structure-function relationship is key to improving photosynthetic efficiency.

Purpose of the Study:

  • To analyze the structural and functional changes of RuBisCO from Alcaligenes eutrophus H16.
  • To investigate configurational changes in different functional states of the enzyme.

Main Methods:

  • Electron microscopy of 2D enzyme crystals in active (Ea), inactive (Eia), and transition state (CABP-E) forms.
  • X-ray crystallography and small-angle X-ray scattering.
  • Biophysical and biochemical analyses.

Related Experiment Videos

Main Results:

  • Drastic configurational changes were observed in RuBisCO during transitions between functional states.
  • A lateral shift of up to 3.6 nm between the L4S4 halves was noted from Ea to CABP-E.
  • A sliding-layer configurational change of 2-2.5 nm was proposed for the Eia state.

Conclusions:

  • RuBisCO undergoes significant structural rearrangements linked to its functional states.
  • Proposed structural changes in bacterial RuBisCO align with models for plant and other bacterial enzymes.
  • These findings contribute to understanding structure-function relationships in L8S8 RuBisCOs.