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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Overview of Myosin Structure and Function01:15

Overview of Myosin Structure and Function

Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well characterized.
Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction. It is...
Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
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...
The Sarcomere01:08

The Sarcomere

A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each myosin...

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Related Experiment Video

Updated: Jun 29, 2026

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays
08:57

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Published on: February 4, 2021

Myosin-I nomenclature.

P G Gillespie1, J P Albanesi, M Bahler

  • 1Oregon Hearing Research Center and Vollum Institute, Oregon Health and Science University, Portland, OR 97201, USA. gillespp@ohsu.edu

The Journal of Cell Biology
|November 29, 2001
PubMed
Summary
This summary is machine-generated.

Vertebrate myosin-I research needs a unified naming system. Adopting the Human Genome Organization (HUGO) nomenclature will reduce confusion and improve genome annotation accuracy for myosin-I genes.

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MultiBac System-Based Purification and Biophysical Characterization of Human Myosin-7a

Published on: August 23, 2024

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The current nomenclature for vertebrate myosin-I genes is fragmented and inconsistent.
  • Multiple naming systems are in use, leading to significant confusion within the research community.
  • This ambiguity hinders accurate gene identification and comparative genomics studies.

Purpose of the Study:

  • To propose a standardized nomenclature system for vertebrate myosin-I genes.
  • To address the existing confusion caused by multiple, overlapping naming conventions.
  • To recommend the adoption of a single, unified system for clarity and consistency.

Main Methods:

  • Review of existing vertebrate myosin-I gene nomenclature.
  • Comparison with established nomenclature systems, including that of the Human Genome Organization (HUGO).
  • Assessment of the suitability of the HUGO nomenclature for genome annotation.

Main Results:

  • Identified significant inconsistencies and redundancies in current myosin-I gene naming.
  • Found that the HUGO nomenclature offers a viable compromise for genome annotation.
  • Demonstrated that universal adoption of the HUGO system would resolve existing ambiguities.

Conclusions:

  • A common nomenclature system is essential for the vertebrate myosin-I field.
  • The Human Genome Organization (HUGO) nomenclature provides a robust framework for standardization.
  • Universal adoption of the proposed system is recommended to enhance research clarity and collaboration.