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A novel 550-kDa protein in skeletal muscle of chick embryo: purification and localization
A Hattori1, J Wakamatsu, T Ishii
1Department of Animal Science, Faculty of Agriculture, Hokkaido University, Japan.
Insights
Researchers discovered a novel 550-kDa protein abundant in early chick skeletal muscle development. This myofibrillar protein is localized to adult muscle fiber peripheries and Z-disks.
Area of Science:
- Biochemistry
- Developmental Biology
- Muscle Physiology
Background:
- Skeletal muscle development involves complex protein expression changes.
- Identifying novel proteins is crucial for understanding muscle structure and function.
Purpose of the Study:
- To identify and characterize a novel protein found in developing chick skeletal muscle.
- To determine the localization and developmental expression pattern of this protein.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for molecular mass determination.
- Protein purification using ultracentrifugation and gel filtration.
- Immunofluorescence and immunoelectron microscopy for protein localization.
- Antibody generation against the purified protein.
Main Results:
- A novel protein with a molecular mass of 550 kDa was identified in chick skeletal muscle.
- This protein was abundant during early embryonic development and decreased significantly in adult muscle.
- Purification yielded a contaminant-free 550-kDa protein.
- The protein localizes to the peripheries of adult muscle fibers and Z-disks of myofibrils.
Conclusions:
- The 550-kDa protein is a novel myofibrillar protein in chicken skeletal muscle.
- Its expression pattern suggests a role in early muscle development.
Abstract:
We have found a novel protein with a molecular mass of 550 kDa on SDS-polyacrylamide gels, which is abundant in skeletal muscle tissues at an early stage of chick embryonic development. The 550-kDa protein decreased with the progress of development, and only a slight amount of the protein was present in adult chicken skeletal muscle. The 550-kDa protein was purified from the cytoplasm of 18 day embryos by a procedure including ultracentrifugation and gel filtration. The purified 550-kDa protein was essentially free of contaminants as judged by SDS-PAGE. By immunofluorescence and immunoelectron microscopy using the antibody raised against the 550-kDa protein, this protein was shown to be localized in the peripheries of adult muscle fibers and at the Z-disks of isolated myofibrils. These findings have led us to conclude that the 550-kDa protein is a novel myofibrillar protein in chicken skeletal muscle.