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Length of myosin rod and its proteolytic fragments determined by electron microscopy
Abstract:
The mean length of rabbit myosin chymotryptic rod in electron micrographs of unidirectionally shadowed preparations was 154 nm. Tryptic light meromyosin prepared from this rod had a mean length of 86 nm whereas long and short S2 measured 62 and 43 nm, respectively. The combined length of light meromyosin and long S2 appeared to be less than that of rod, which indicated that possibly some material was lost on digestion. Molecular lengths agreed with sedimentation equilibrium Mr values but were lower than those indicated by gel electrophoresis.
Insights
Rabbit myosin rod length was measured using electron microscopy. Digestion yielded fragments (light meromyosin and S2) whose combined lengths were shorter than the original rod, suggesting material loss during digestion.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Myosin rod structure is crucial for muscle function.
- Understanding myosin rod fragmentation aids in characterizing its molecular architecture.
Purpose of the Study:
- To determine the molecular length of rabbit myosin rod and its fragments.
- To investigate potential material loss during enzymatic digestion of myosin rod.
Main Methods:
- Electron microscopy of unidirectionally shadowed rabbit myosin chymotryptic rod.
- Preparation and measurement of tryptic light meromyosin and S2 fragments.
Main Results:
- Rabbit myosin rod mean length was 154 nm.
- Light meromyosin (86 nm) and S2 fragments (long: 62 nm, short: 43 nm) were measured.
- Combined fragment lengths were less than rod length, indicating possible material loss.
Conclusions:
- Enzymatic digestion may lead to loss of material from the myosin rod.
- Measured molecular lengths correlate with sedimentation equilibrium data but not gel electrophoresis data.