Related Experiment Video
Updated: Jul 18, 2026

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
Published on: November 1, 2012
Raver1 is an integral component of muscle contractile elements
Anke Zieseniss1, Ulrich Schroeder, Sabine Buchmeier
1Cell Biology, Zoological Institute, Technical University of Braunschweig, Biocentre, Spielmannstrasse 7, 38092 Braunschweig, Germany.
Raver1 protein moves from the nucleus to the cytoplasm during muscle differentiation, localizing to sarcomeres in skeletal, heart, and smooth muscles. This suggests Raver1 links gene expression to muscle structure and function.
Area of Science:
- Muscle biology
- Cellular and molecular biology
- Protein localization
Background:
- Raver1 (related to alternative splicing) was identified as a metavinculin ligand.
- Raver1 is primarily nuclear but translocates to the cytoplasm during skeletal muscle differentiation.
- It localizes to sarcomeres, interacting with vinculin and alpha-actinin.
Purpose of the Study:
- To investigate the distribution and localization of Raver1 in mouse striated and smooth muscles.
- To understand the potential role of Raver1 in muscle structure and function.
Main Methods:
- Utilized three monoclonal antibodies against Raver1.
- Employed immunofluorescence and immunoelectron microscopy techniques.
- Examined Raver1 distribution in skeletal, heart, and smooth muscles.
Main Results:
- Cytoplasmic Raver1 accumulation occurs in skeletal, heart, and smooth muscles.
- Cytoplasmic Raver1 is integral to sarcomeres, not just costameres.
- Raver1 concentrates at the I-Z-I bands in myofibrils and skeletal muscle sections.
- A small fraction of Raver1 remains in the nuclei of all muscle types.
Conclusions:
- Raver1's cytoplasmic localization extends beyond skeletal muscle to heart and smooth muscle.
- Raver1 is a component of the sarcomere, localizing to the I-Z-I band.
- Raver1 may connect gene expression regulation with the structural functions of the muscle contractile apparatus during differentiation.
More Related Videos
07:55Isolating Myofibrils from Skeletal Muscle Biopsies and Determining Contractile Function with a Nano-Newton Resolution Force Transducer
Published on: May 7, 2020
08:26X-ray Diffraction of Intact Murine Skeletal Muscle as a Tool for Studying the Structural Basis of Muscle Disease
Published on: July 18, 2019
Related Concept Videos
Actin and Myosin in Muscle Contraction
The Sarcomere
Each myosin...
Microscopic Anatomy of Skeletal Muscles
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
Overview of Skeletal Muscle
Muscle Contraction
Muscle Contraction