Add time:08/13/2019 Source:sciencedirect.com
Electron paramagnetic resonance (EPR) spectroscopy was used for investigation of the structure of spin-labeled myosin subfragment 1 (S1) containing ADP and phosphate analogues, such as orthovanadate, aluminium fluoride (AlF4), and beryllium fluoride (BeFx). It has been shown that the local conformational changes in the region of Cys-707, induced by formation of the S1-ADP-BeFx complex, differ from those of S1 containing ADP-AlF4 or other phosphate analogues but are similar to the changes which occur in the presence of ADP or ATPγS. It is suggested that S1-ADP-AlF4 and S1-ADP-BeFx complexes represent structural analogues of different transition states of the ATPase cycle, namely the intermediate states S1**-ADP-Pi and S1*-ATP, respectively.
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