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Solution structure of apocytochrome b562

Y Feng1, S G Sligar, A J Wand

  • 1Department of Biochemistry, 415 Roger Adams Laboratory, University of Illinois at Urbana-Champaign 61801, USA.

Nature Structural Biology
|January 1, 1994
PubMed
Summary
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We determined the NMR structure of apocytochrome b562, revealing a molten globule state. This structure clarifies the folding intermediate of haem proteins and explains molten globule properties.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding

Background:

  • Apoproteins are crucial intermediates in the folding of haem proteins.
  • Detailed structures of these folding intermediates have been difficult to obtain.
  • Understanding these intermediates is key to deciphering protein folding pathways.

Purpose of the Study:

  • To elucidate the structure of apocytochrome b562, a key folding intermediate.
  • To investigate the structural differences between the apoprotein and holoprotein forms.
  • To understand the structural basis for the molten globule characteristics of apocytochrome b562.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to determine the three-dimensional structure.
  • Structural analysis focused on comparing the apoprotein structure to its holoprotein counterpart.

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Main Results:

  • The NMR structure of apocytochrome b562 was successfully determined.
  • The apoprotein shares a similar overall topology with the holoprotein but exhibits distinct helix-helix packing.
  • The haem binding pocket is largely intact but solvent-exposed, forming a large cavity in the apoprotein.

Conclusions:

  • Apocytochrome b562 adopts a structure consistent with the molten globule state.
  • The structural findings provide insights into the physical characteristics and properties of protein molten globules.
  • This study advances the understanding of haem protein folding intermediates and their structural dynamics.