PMID: 2110004Apr 19, 1990Paper

Anti-TNP antibody localization of the reactive lysine residues in myosin

Biochimica Et Biophysica Acta
M Dan-GoorA Mühlrad

Abstract

Myosin contains reactive lysine residues which are trinitrophenylated by 2,4,6-trinitrobenzene sulfonate much faster than the rest of the lysines. Here we find the location of these residues in the primary and spatial structure of myosin with the help of an anti-trinitrophenyl antibody. This antibody was raised against trinitrophenyl hemocyanin in rabbits. It reacted with trinitrophenylated myosin, and with some of the tryptic fragments of trinitrophenylated myosin. By analyzing the reaction with Western blots, it was found that the antibody preferentially reacts with the 27 kDa N-terminal fragment of the myosin head, and more weakly with the light meromyosin region of the myosin rod. The 27 kDa fragment contains the most reactive lysine residue, while the intermediate lysine residue is located in the light meromyosin region. The locations of the epitopes of the antibody were visualized on electron microscope images of rotary-shadowed trinitrophenylated myosin-antibody complexes. The distances of the epitopes to the head-rod junction of myosin were measured as 13 and 113 nm for the epitope on the head (reactive lysine residue) and for that on the rod (intermediary reactive lysine residue), respectively.

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