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JBC, Vol. 252, Issue 6, 1869-1872, Mar, 1977

Interaction of AMP-aminohydrolase with myosin and its subfragments

B. Ashby and C. Frieden

We have shown that purified rabbit skeletal muscle AMP-aminohydrolase binds to rabbit muscle myosin, heavy meromyosin, and Subfragment 2 but does not bind to light meromyosin nor to Subfragment 1. The dissociation constant for binding to myosin was determined to be 0.14 muM. A new sedimentation boundary, presumably reflecting formation of a complex between AMP-aminohydrolase and heavy meromyosin or Subfragment 2, can be observed using the analytical ultracentrifuge. Binding of AMP-aminohydrolase to myosin, heavy meromyosin, or Subfragment 2 is abolished by phosphate (less than 10 mM), an inhibitor of AMP-aminohydrolase. No other rabbit muscle enzyme tested showed any interaction with myosin under the same conditions and there was no indication of complex formation between AMP-aminohydrolase and phosphofructokinase or phosphocreatine kinase in the analytical ultracentrifuge.
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