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Related Concept Videos

Cytoskeletal Accessory Proteins01:13

Cytoskeletal Accessory Proteins

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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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Integrins01:10

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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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Septins01:19

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Septins are protein filaments forming the cytoskeleton along with the microtubules, microfilaments, intermediate filaments, and other accessory proteins. In 1971 while studying the cell division cycle in mutant Saccharomyces cerevisiae Harwell et al. first identified the septin-related genes playing a crucial role in yeast cytokinesis. Fluorescence microscopy revealed that these proteins localize at the budding neck as rings. These ring-like proteins were then named Septins by John Pringle, and...
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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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Cytoskeletal Linker Proteins - Plakins01:09

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Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
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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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Purification and Quality Control of Recombinant Septin Complexes for Cell-Free Reconstitution
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Cytoskeletal Integrators: The Spectrin Superfamily.

Ronald K H Liem1

  • 1Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York 10032.

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Summary
This summary is machine-generated.

The spectrin protein superfamily links cellular structures, evolving from ancestral proteins to connect the cytoskeleton, cell membrane, and nucleus. Mutations in these proteins are linked to various diseases.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The spectrin superfamily is a diverse group of proteins crucial for cellular structure and organization.
  • These proteins act as molecular scaffolds, connecting various cellular components.

Purpose of the Study:

  • To review the spectrin superfamily, including their domain organization, protein interactions, and functional roles.
  • To discuss the link between spectrin mutations and human diseases.
  • To explore the evolutionary origins and diversification of the spectrin family.

Main Methods:

  • Literature review of spectrin protein family.
  • Analysis of domain organization and protein-protein interaction data.
  • Examination of disease-associated mutations and null phenotypes.

Main Results:

  • Spectrin proteins share a conserved spectrin repeat domain.
  • Evolutionary analysis reveals diversification from ancestral proteins like α-actinin.
  • Different subclasses (spectrin, dystrophin, spectraplakins, nesprins) have specialized functions.

Conclusions:

  • The spectrin superfamily plays vital roles in maintaining cellular integrity and function.
  • Understanding spectrin protein evolution and function provides insights into cellular mechanics and disease pathogenesis.