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Microtubule Associated Motor Proteins

Microtubule Associated Motor Proteins

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 cargos...

The Movement of Organelles and Vesicles

The Movement of Organelles and Vesicles

In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...

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Anaphase A and B

Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
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Microtubules in Cell Motility

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

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Actin Polymerization and Cell Motility

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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Related Experiment Video

Updated: Jun 23, 2026

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis

Published on: October 30, 2014

Molecular motors: a traffic cop within?

M A Welte, S P Gross

|May 1, 2009

Summary

Cellular transport relies on motor proteins. A new model shows that simple motor competition, not complex regulation, can explain bidirectional intracellular transport dynamics.

Area of Science:

Cell Biology
Biophysics
Systems Biology

Background:

Intracellular transport along microtubules is crucial for cell function.
Bidirectional transport involves multiple motor proteins with opposing directions.
Mechanisms regulating this transport remain incompletely understood.

Purpose of the Study:

To develop a novel modeling approach for intracellular transport.
To predict transport behavior based solely on motor properties.
To investigate the role of motor competition in bidirectional transport.

Main Methods:

Developed a computational model simulating motor protein interactions.
Analyzed emergent motion patterns from motor dynamics.
Compared model predictions with known aspects of in vivo cargo transport.

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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

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Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

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Related Experiment Videos

Last Updated: Jun 23, 2026

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis

Published on: October 30, 2014

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Published on: May 10, 2022

Main Results:

The model successfully generated complex, bidirectional motion patterns.
Motor coordination, previously thought to require external regulation, emerged from simulated motor tug-of-war dynamics.
The model demonstrated that cargo transport can be explained by motor competition alone.

Conclusions:

Motor competition can intrinsically generate bidirectional intracellular transport.
This challenges the necessity of complex regulatory mechanisms for transport control.
Further research is needed to determine the balance between motor tuning and higher-order control in cellular transport.