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Related Concept Videos

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
Cell Motility through Blebbing01:16

Cell Motility through Blebbing

Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
Membrane Asymmetry Regulating Transporters01:19

Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin networks...
The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate filaments...

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Flapping Soft Fin Deformation Modeling using Planar Laser-Induced Fluorescence Imaging
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Research advances on flotillins.

Feng Zhao1, Jie Zhang, Yong-Sheng Liu

  • 1State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046 Gansu, P.R. China.

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Summary

Flotillins are key proteins in cell membranes, involved in processes like axon regeneration and cell signaling. This review explores their structure and diverse functions, clarifying their roles in health and disease.

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Immunology

Background:

  • Flotillin-1 and flotillin-2 proteins were first identified in goldfish retinal ganglion cell axon regeneration.
  • They are recognized as marker proteins for lipid rafts and scaffolding proteins for lipid microdomains.
  • Despite ubiquitous expression and conservation across species, their precise functions are debated.

Purpose of the Study:

  • To review the structural characteristics of flotillins.
  • To summarize the known and proposed functions of flotillins.
  • To provide insights into the roles of flotillins in various biological processes and diseases.

Main Methods:

  • Literature review of existing research on flotillins.
  • Analysis of studies investigating flotillin structure and function.
  • Synthesis of findings related to flotillin involvement in cellular mechanisms.

Main Results:

  • Flotillins exhibit conserved structures across species.
  • They play roles in axon regeneration, endocytosis, and T cell activation.
  • Flotillins are implicated in insulin signaling, membrane protein recruitment, and disease progression.

Conclusions:

  • Flotillins are versatile scaffolding proteins with diverse cellular functions.
  • Further research is needed to fully elucidate their complex roles.
  • Understanding flotillins is crucial for insights into cellular processes and disease pathogenesis.