[Isolation of myosin light chain from porcine heart by preparative electrophoresis and study of the polypeptides obtained by cyanogen bromide action]

Methodology for purification of large hydrophobic peptides by high-performance liquid chromatography

To aid in structural studies of pig cardiac myosin light chains (L27 and L28), a procedure of ion-exchange chromatography (IEC) on Trisacryl M (noted for its high capacity) in combination with reversed-phase high-performance liquid chromatography (RP-HPLC) and volatile buffers has been developed. In contrast with other IEC methods (resins or HPIEC), the use of Trisacryl M facilitates subsequent peptide purifications by RP-HPLC. The advantage of the present combination of techniques is also that it enables the isolation of hydrophobic peptides in high yield, e.g., the N-terminal chymotryptic peptide from L27 was thus purified and, after sub-digestion with trypsin, its sequence has been established.

Phylogenetic studies of cardiac myosins from amphibia to mammals

Comparison between pig atrial and ventricular myosins was performed on the light chains (using SDS-PAGE) and on the heavy chains (using Ca2+-ATPase measurements and NTCBA peptide mapping). Light chain composition of pig cardiac myosins was compared to three other species ones (frog, chicken and human). Up to birds, atrial and ventricular myosin light chain composition was identical whereas in mammals atrial and ventricular myosin light chain composition was different; likewise the heavy chains. Six cardiac myosin isoenzymes have been thus characterized. No correlation can be established between cardiac myosin light chain pattern and species evolution.