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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 cargos...

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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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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...

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Related Experiment Video

Updated: Jun 12, 2026

In vitro Assembly of Semi-artificial Molecular Machine and its Use for Detection of DNA Damage

In vitro Assembly of Semi-artificial Molecular Machine and its Use for Detection of DNA Damage

Published on: January 11, 2012

Membrane-associated DNA transport machines.

Briana Burton¹, David Dubnau

¹Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, USA.

Cold Spring Harbor Perspectives in Biology

|June 25, 2010

Summary

Bacterial DNA pumps are crucial for cell division, conjugation, and transformation. This review details the molecular mechanisms, energy requirements, and locations of these essential DNA transport systems.

Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

DNA pumps are vital molecular machines in bacteria.
They facilitate essential processes like cell division, genetic material transfer (conjugation), and DNA uptake (transformation).
Key proteins like FtsK/SpoIIIE are involved in chromosome segregation.

Purpose of the Study:

To review the functions and mechanisms of bacterial DNA pumps.
To compare and contrast DNA translocation during cell division, conjugation, and transformation.
To highlight current understanding of their molecular machinery, energetics, and cellular localization.

Main Methods:

Literature review of existing research on bacterial DNA pumps.
Comparative analysis of FtsK/SpoIIIE, conjugation, and transformation systems.

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Last Updated: Jun 12, 2026

In vitro Assembly of Semi-artificial Molecular Machine and its Use for Detection of DNA Damage

In vitro Assembly of Semi-artificial Molecular Machine and its Use for Detection of DNA Damage

Published on: January 11, 2012

DNAzyme 10-23 - Based Nanomachines for Nucleic Acid Recognition

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Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution

Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution

Published on: July 8, 2019

Synthesis of information on molecular mechanisms, energetics, and localization.

Main Results:

FtsK/SpoIIIE proteins translocate double-stranded DNA for cell division.
Conjugation and transformation machinery transport single-stranded DNA.
Transformation systems also process and integrate internalized DNA, while conjugation prepares DNA before transfer.

Conclusions:

Bacterial DNA pumps exhibit diverse mechanisms for DNA translocation.
Understanding these systems is key to comprehending bacterial genetics and cell biology.
Further research into their energetics and localization will elucidate their full roles.