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Related Concept Videos

The Nucleus01:25

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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Overview of Myosin Structure and Function01:15

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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...
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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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Role of Myosin in Cell Migration01:18

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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.
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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Myosins in the Nucleus.

Ivan V Maly1, Wilma A Hofmann2

  • 1Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York, Buffalo, NY, USA.

Advances in Experimental Medicine and Biology
|May 27, 2020
PubMed
Summary
This summary is machine-generated.

Nuclear myosins, including myosin IC, V, and VI, play crucial roles in nuclear functions like transcription and chromatin dynamics. This review outlines their nuclear import, interactions, and functions, paving the way for a systems-level understanding.

Keywords:
ChromatinIntranuclear motilityLocalizationMyosinMyosin ICNuclear actinNuclear exportNuclear importNuclear myosinNucleolusNucleusRNA processingTranscription

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Myosins were initially known as cytoplasmic proteins.
  • Emerging evidence highlights diverse nuclear functions for various myosin classes.

Purpose of the Study:

  • To review nuclear localization, entry mechanisms, and functional interactions of myosins.
  • To consolidate current knowledge on nuclear myosin roles and identify research gaps.

Main Methods:

  • Literature review focusing on nuclear myosins.
  • Analysis of data on myosin IC, V, and VI in transcription.
  • Discussion of myosin involvement in chromatin dynamics, epigenetics, and transport.

Main Results:

  • Myosin IC is the most studied nuclear myosin, with accumulating data on other classes.
  • Myosins are involved in nuclear import regulation, transcription, chromatin dynamics, and RNA/protein export.
  • Key partners like nuclear actin, kinases, and phosphatases are identified.

Conclusions:

  • A unified picture of nuclear myosin functions is emerging.
  • Further research is needed to understand the systems-level implications of nuclear myosins in cell physiology.
  • Testable hypotheses are proposed to guide future research efforts.