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Horse heart metmyoglobin. A 2.8-A resolution three-dimensional structure determination
1Department of Biochemistry, University of British Columbia, Vancouver, Canada.
The Journal of Biological Chemistry
|March 25, 1988
Summary
The structure of horse heart metmyoglobin was determined, revealing unique conformations and salt-bridging interactions compared to sperm whale metmyoglobin. Thermal motions correlate with proximity to the heme group.
Area of Science:
- Structural Biology
- Biochemistry
- Protein Crystallography
Background:
- Metmyoglobin is a key protein in oxygen transport.
- Understanding protein structure is crucial for elucidating function.
- Previous studies have characterized various myoglobin structures.
Purpose of the Study:
- To determine the high-resolution three-dimensional structure of horse heart metmyoglobin.
- To compare the structure of horse heart metmyoglobin with that of sperm whale metmyoglobin.
- To investigate the relationship between protein dynamics and heme proximity.
Main Methods:
- X-ray crystallography
- Molecular replacement
- Rigid body refinement
- Restrained-parameter least squares refinement
Main Results:
- The structure of horse heart metmyoglobin was refined to 2.8 A resolution.
- Unique polypeptide chain conformations were identified in four regions compared to sperm whale metmyoglobin.
- Thermal motions of residues correlate with their distance from the heme group.
Conclusions:
- Horse heart metmyoglobin exhibits distinct structural features and salt-bridging patterns.
- Differences in conformation are attributed to variations in surface salt bridges.
- The study provides insights into protein dynamics and structural variations in myoglobin.