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Related Concept Videos

Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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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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Kendall's Tau Test01:16

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Kendall's tau test, also known as the Kendall rank coefficient test, is a nonparametric method for assessing association between two variables. This test is particularly useful for identifying significant correlations when the distributions of the sample and population are unknown. Developed in 1938 by the British statistician Sir Maurice George Kendall, the tau coefficient (denoted as τ) serves as a rank correlation coefficient, with values ranging from -1 to +1.
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Disassembly of Intermediate Filaments01:35

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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Adaptability of Cytoskeletal Filaments01:12

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Types of Intermediate Filaments01:31

Types of Intermediate Filaments

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The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
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Formation of Intermediate Filaments00:57

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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Tau Assembly into Filaments.

Mar Pérez1, Raquel Cuadros2, Miguel Medina3

  • 1Department of Anatomy, Histology and Neurosciences, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, Madrid, 28029, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|June 11, 2018
PubMed
Summary
This summary is machine-generated.

This study details methods for purifying tau protein aggregates and forming tau filaments in vitro. Understanding tau aggregation is crucial for developing treatments for neurodegenerative diseases like Alzheimer's disease.

Keywords:
AggregationAlzheimer’s diseaseNeurofibrillary tanglesPaired helical filamentsTauTauopathies

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Tau protein is essential for microtubule stability and neuronal function.
  • Dysfunctional tau protein aggregation causes neurodegenerative tauopathies, including Alzheimer's disease (AD).
  • Pathological tau forms paired helical filaments (PHF) and neurofibrillary tangles (NFT) in AD brains, correlating with cognitive decline.

Purpose of the Study:

  • To elucidate the mechanisms of tau protein aggregation and fibril formation.
  • To establish experimental procedures for studying tau pathology.
  • To provide a foundation for developing therapeutic strategies against tauopathies.

Main Methods:

  • Purification of PHF from human postmortem brain tissue.
  • Expression and purification of recombinant tau protein.
  • In vitro assembly of tau filaments from purified recombinant tau.

Main Results:

  • The study describes complementary experimental procedures for tau research.
  • Methods allow for the purification of pathological tau aggregates (PHF).
  • In vitro techniques enable the formation of tau filaments from recombinant tau.

Conclusions:

  • Understanding tau aggregation mechanisms is vital for combating neurodegenerative diseases.
  • The described methods facilitate further investigation into tauopathies.
  • This research supports the development of interventions targeting tau pathology in AD and other tauopathies.