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A phosphorus-31 nuclear magnetic resonance study on the complex of chicken gizzard myosin subfragment 1 with
1Biotechnology Research Center, University of Tokyo, Japan.
Abstract:
The complex of Mg-ADP with chicken gizzard myosin subfragment 1 (S1), obtained by the treatment with Staphylococcus aureus V8 proteinase, was observed with 31P NMR at various temperatures between 0 and 25 degrees C. The signal of S1.ADP complex was observed at -2 to -3 ppm as a rather broad peak. As compared with the results for rabbit skeletal muscle S1.ADP complex (Tanokura M, Ebashi S: J Biochem 113: 19-21, 1993), the signal was assigned to beta-phosphate of ADP in the S1.ADP complex. The signal of the complex was so broad and weak that the dependences on temperature and magnetic field strength were not clear. The observation suggests the tight interaction of S1 with the phosphate moieties of ADP in the complex and the extremely anisotropic distribution of electrons around phosphorus nuclei.
Insights
Chicken gizzard myosin subfragment 1 (S1) tightly binds ADP, as shown by 31P NMR. This interaction suggests a specific binding site for ADP
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- Myosin subfragment 1 (S1) is a key motor protein involved in muscle contraction.
- Understanding the interaction between S1 and its nucleotide ligands, such as ADP, is crucial for elucidating the mechanism of muscle function.
Purpose of the Study:
- To investigate the binding interaction of Mg-ADP with chicken gizzard myosin subfragment 1 (S1) using 31P Nuclear Magnetic Resonance (NMR).
- To characterize the structural and dynamic properties of the S1.ADP complex.
Main Methods:
- Chicken gizzard myosin subfragment 1 (S1) was prepared using Staphylococcus aureus V8 proteinase.
- 31P NMR spectroscopy was employed to observe the S1.ADP complex at temperatures ranging from 0 to 25 degrees C.
- Comparison of spectral data with rabbit skeletal muscle S1.ADP complex.
Main Results:
- A broad 31P NMR signal for the S1.ADP complex was observed between -2 and -3 ppm, assigned to the beta-phosphate of ADP.
- The signal's broadness and weakness, with unclear temperature and magnetic field dependencies, indicate a tight interaction between S1 and ADP.
- Evidence of extremely anisotropic electron distribution around phosphorus nuclei was noted.
Conclusions:
- The study confirms a tight interaction between chicken gizzard myosin S1 and the phosphate moieties of ADP.
- The observed NMR characteristics suggest specific binding and restricted dynamics within the S1.ADP complex.
- These findings contribute to understanding the molecular basis of myosin's interaction with nucleotides.