Refined conditions for selective modifications of rabbit skeletal myosin light chains

We selectively modified the LC1 and LC2 N-terminus as an approach to understand the function of skeletal myosin light chains and their possible implication in some diseases. Three new myosin isoforms were thus created, namely: myosin-[(P)LC1'], myosin-[(T)LC2'] and myosin-[(CT)LC2"] in which the N-terminus was selectively cleaved at Lys7 in (P)LC1', Arg8 in (T)LC2' and Phe19 in (CT)LC2". In order to obtain species with a minimum amount of secondary cleavages, eight to 12 different conditions were screened for each species and the two most efficient conditions were tested at the preparative scale.