title: Nucleotide trapping at the ATPase site of myosin subfragment 1 by a new interthiol crosslinking.
abstract: When myosin subfragment 1 derivatives in which the reactive sulfhydryl SH1 has been blocked react with N,N'-p-phenylenedimaleimide or 5,5'-dithiobis(2-nitrobenzoic acid), the reactive sulfhydryl group SH2 of the 20-kDa domain is crosslinked with a thiol of the 50-kDa domain of the heavy chain. The crosslink induces the stable trapping of a significant amount of Mg2+-nucleotide in the ATPase site.
mesh_terms: D000227:Adenine Nucleotides / Q000378:metabolism*; D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D000818:Animals; D001665:Binding Sites; D000252:Calcium-Transporting ATPases / Q000378:metabolism; D066298:In Vitro Techniques; D007700:Kinetics; D046911:Macromolecular Substances; D008274:Magnesium / Q000378:metabolism; D015879:Myosin Subfragments; D009218:Myosins / Q000378:metabolism*; D010446:Peptide Fragments / Q000378:metabolism*; D011817:Rabbits; D013438:Sulfhydryl Compounds; D013439:Sulfhydryl Reagents / Q000494:pharmacology
chemical_list: D000227:Adenine Nucleotides; D046911:Macromolecular Substances; D015879:Myosin Subfragments; D010446:Peptide Fragments; D013438:Sulfhydryl Compounds; D013439:Sulfhydryl Reagents; D000251:Adenosine Triphosphatases; D009218:Myosins; D000252:Calcium-Transporting ATPases; D008274:Magnesium