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Related Concept Videos

The Sarcomere01:08

The Sarcomere

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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.
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Actin and Myosin in Muscle Contraction01:16

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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...
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Introduction to the Cytoskeleton01:33

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Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶   microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their...
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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Assembly of Cytoskeletal Filaments01:18

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Microscopic Anatomy of Skeletal Muscles01:13

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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.
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Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics
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The sarcomeric cytoskeleton: from molecules to motion.

Mathias Gautel1, Kristina Djinović-Carugo2

  • 1King's College London BHF Centre of Research Excellence, Randall Division for Cell and Molecular Biophysics, and Cardiovascular Division, New Hunt's House, London SE1 1UL, UK mathias.gautel@kcl.ac.uk.

The Journal of Experimental Biology
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

The sarcomeric cytoskeleton, crucial for muscle contraction, uses specific protein structures like pivot-and-rod (α-actinin) and ball-and-spring (myomesin) to maintain muscle integrity during movement and exercise.

Keywords:
CytoskeletonM-bandMyomesinObscurinSarcomereStriated muscleTitinZ-diskα-Actinin

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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Area of Science:

  • Muscle Biology
  • Biophysics
  • Structural Biology

Background:

  • Highly ordered sarcomeric organization is essential for efficient muscle force generation.
  • The sarcomeric cytoskeleton provides architectural, mechanical, and signaling roles for sarcomere assembly.
  • Understanding sarcomeric protein assembly is key to muscle function and integrity.

Purpose of the Study:

  • To review recent insights into the assembly and function of sarcomeric cytoskeleton proteins.
  • To explore the roles of these proteins in maintaining sarcomere integrity.
  • To discuss the structural basis of force dissipation in muscle.

Main Methods:

  • Cell biology techniques
  • Biophysical analyses
  • Structural studies

Main Results:

  • α-Actinin in Z-disks forms pivot-and-rod structures anchoring actin and titin.
  • Myomesin in M-bands forms ball-and-spring crosslinks for myosin.
  • These structures are vital for maintaining sarcomere integrity during passive and active muscle states.

Conclusions:

  • Sarcomeric cytoskeleton proteins exhibit distinct structural mechanisms for force management.
  • Pivot-and-rod and ball-and-spring structures are critical for muscle function, particularly during eccentric contractions.