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Related Concept Videos

Microtubule Associated Proteins (MAPs)01:42

Microtubule Associated Proteins (MAPs)

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Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
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Assembly of Complex Microtubule Structures01:32

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Cytoskeletal Accessory Proteins01:13

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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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Microtubule Instability02:17

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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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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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Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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Related Experiment Video

Updated: Jun 13, 2025

Extracting Modified Microtubules from Mammalian Cells to Study Microtubule-Protein Complexes by Cryo-Electron Microscopy
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Microtubule-associated protein, MAP1B, encodes functionally distinct polypeptides.

Tracy C Tan1, Yusheng Shen1, Lily B Stine1

  • 1Department of Molecular and Cellular Biology, University of California, Davis, California, USA.

The Journal of Biological Chemistry
|September 21, 2024
PubMed
Summary

Microtubule-associated protein 1B (MAP1B) heavy chain (HC) and light chain (LC) function independently. MAP1B HC and LC differentially regulate cytoskeletal dynamics, impacting neuronal development.

Keywords:
DYRK1aactindyneinkinesinmicrotubule-associated protein (MAP)microtubulesphosphorylation

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Microtubule-associated protein 1B (MAP1B) is vital for neuronal development.
  • MAP1B is processed into heavy (HC) and light (LC) chains, but their independent functions are unclear.

Purpose of the Study:

  • To investigate the distinct biophysical properties and functions of MAP1B HC and LC.
  • To determine if MAP1B HC and LC operate as a complex or independently.

Main Methods:

  • In vitro reconstitution using purified MAP1B HC and LC.
  • Biochemical assays to analyze protein binding and motor inhibition.
  • Investigating the effects of MAP1B phosphorylation on actin-binding activity.

Main Results:

  • MAP1B HC and LC do not form a constitutive complex and function independently.
  • Both HC and LC inhibit kinesin and dynein motors; they differentially affect spastin activity.
  • MAP1B LC binds and cross-links actin filaments and microtubules; HC's actin binding is regulated by phosphorylation.

Conclusions:

  • MAP1B HC and LC possess distinct biochemical properties and functional roles.
  • MAP1B's independent chains coordinate cytoskeletal networks in neuronal development.
  • MAP1B phosphorylation dynamically regulates cytoskeletal organization via HC activity.