Related Experiment Video
Updated: May 13, 2026
06:08
Biophysical Characterization of Flagellar Motor Functions
Published on: January 18, 2017
Analysis of interactions between intraflagellar transport proteins
Robert H Behal1, Douglas G Cole
1Department of Biological Sciences, University of Idaho, Moscow, Idaho, USA.
Methods in Enzymology
|March 19, 2013
Summary
Intraflagellar transport (IFT) complexes A and B were studied using Chlamydomonas reinhardtii. Researchers identified core subcomplexes and protein interactions within these essential cellular machinery components.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Intraflagellar transport (IFT) is crucial for the assembly and function of cilia and flagella.
- IFT particles are composed of two main complexes, IFT-A and IFT-B, each containing numerous protein subunits.
- Understanding the structural organization of IFT complexes is key to elucidating their transport mechanism.
Purpose of the Study:
- To investigate the subcomplex organization and protein-protein interactions within IFT-A and IFT-B.
- To identify the core structural components of IFT-A and IFT-B using a model organism.
Main Methods:
- Biochemical approaches: chemical cross-linking and native complex disruption.
- Molecular approaches: yeast two-hybrid screening and heterologous expression.
- Genetic approaches: analysis of Chlamydomonas IFT mutants.
Main Results:
- IFT-B complex analysis revealed a stable core subcomplex comprising nine subunits.
- IFT-A complex analysis identified a core subcomplex containing half of its constituent subunits.
- Specific protein-protein interactions within both complexes were mapped.
Conclusions:
- The study elucidates the modular architecture of IFT-A and IFT-B complexes.
- Identified core subcomplexes provide a foundation for understanding IFT particle assembly and function.
- This research contributes to the comprehension of ciliary and flagellar biology.
More Related Videos
Related Concept Videos
01:32Microtubule 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...
01:24Microtubules in Cell Motility
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...
01:24Microtubules in Cell Motility
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...
01:43The 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,...
01:35Disassembly of Intermediate Filaments
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...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
01:39Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...