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A monomeric insulin from the casiragua: molecular model building using computer graphics
Hoppe-Seyler'S Zeitschrift Fur Physiologische Chemie
|June 1, 1981
Summary
Casiragua insulin, modeled using computer graphics, shares structural similarities with porcine insulin but cannot self-associate due to altered surface properties. This structural difference, particularly a B26-tyrosine to arginine substitution, reduces its receptor-binding potency.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biology
Background:
- Insulin's structure is crucial for its function and self-assembly.
- Understanding variations in insulin structure can reveal insights into receptor binding and biological activity.
Purpose of the Study:
- To construct a 3D model of casiragua insulin.
- To investigate its structural homology with porcine insulin.
- To elucidate the molecular basis for its self-association and receptor-binding properties.
Main Methods:
- Interactive computer graphics for 3D model construction.
- Comparative analysis of structural features (hydrophobic core, surface properties).
- Far ultra violet circular dichroism spectroscopy.
Main Results:
- Casiragua insulin's 3D model shows conserved hydrophobic core but more hydrophilic/charged surfaces compared to porcine insulin.
- Far UV CD spectra indicate structural similarity to porcine insulin.
- Casiragua insulin does not self-associate.
- Substitution of B26-tyrosine by arginine is linked to reduced receptor-binding potency.
Conclusions:
- Casiragua insulin exhibits distinct self-association properties due to surface residue changes.
- The B26-arginine substitution significantly impacts receptor binding affinity.
- Structural modeling provides a basis for understanding functional differences in insulin analogs.