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Domain interactions in human plasminogen studied by proton NMR
A J Teuten1, R A Smith, C M Dobson
1Oxford Centre for Molecular Sciences, University of Oxford, UK.
FEBS Letters
|January 14, 1991
Summary
Nuclear magnetic resonance (NMR) studies show that miniplasminogen
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Plasminogen is a key protein in fibrinolysis.
- Miniplasminogen, a truncated form, and Glu1-plasminogen are important variants for studying plasminogen structure-function relationships.
Purpose of the Study:
- To investigate the structural and motional independence of the kringle and protease domains in miniplasminogen.
- To determine if this domain independence is maintained in intact Glu1-plasminogen.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy.
- Analysis of chemical shifts and temperature-dependent unfolding transitions.
Main Results:
- NMR spectra of miniplasminogen revealed distinct resonances for the kringle 5 domain.
- Temperature-dependent unfolding showed kringle 5 domain stability separate from the protease domain.
- Glu1-plasminogen spectra mirrored miniplasminogen, indicating conserved domain independence.
Conclusions:
- The kringle and protease domains of miniplasminogen exhibit significant structural and motional independence.
- This domain independence is preserved in the intact Glu1-plasminogen molecule.