Abstract
1. 1. A positively-charged N-ethylmaleimide (NEM) derivative, 4-( N-maleimido)benzyltrimethylammonium iodide (MBTA), bound to Cys-373 of G-actin. 2. 2. The reaction of MBTA with G-actin was much faster than that of NEM or of 5,5'-dithiobis-(2-nitrobenzoic acid) (DTNB). 3. 3. MBTA-labeling to myosin subfragment-1 (S-l) has qualitatively the same effects on S-1 ATPase activity as NEM-labeling. 4. 4. The reaction of MBTA with S-1 was slower and less specific than that of NEM.
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