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Structural characterization of a partly folded apomyoglobin intermediate.

F M Hughson¹, P E Wright, R L Baldwin

¹Department of Biochemistry, Beckman Center, Stanford University School of Medicine, CA 94305.

Science (New York, N.Y.)

|September 28, 1990

Summary

Researchers studied a partly folded apomyoglobin intermediate using nuclear magnetic resonance (NMR) to understand protein structure. They found specific helix regions maintain structure while others unfold, revealing insights into protein folding hierarchies.

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Area of Science:

Protein structure and folding
Biophysical chemistry
Structural biology

Background:

Understanding protein structure is crucial for elucidating biological functions.
Partly folded protein states offer insights into the hierarchy of stabilizing interactions.

Purpose of the Study:

To structurally characterize a partly folded apomyoglobin intermediate.
To dissect the protein organizational hierarchy by studying partially folded states.

Main Methods:

Trapping slowly exchanging peptide NH protons.
Analyzing proton exchange using two-dimensional proton nuclear magnetic resonance (1H-NMR).

Main Results:

Protons in the A, G, and H helix regions were protected from exchange.

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Protons in the B and E helix regions exchanged freely.

A structural model for the intermediate was proposed.

Conclusions:

The partly folded apomyoglobin intermediate features a compact subdomain that retains structure.
The remaining parts of the protein are largely unfolded in this intermediate state.
This study provides a model for understanding protein folding pathways and stability.