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Mechanism of Filopodia Formation01:39

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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.
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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The Structure of Intermediate Filaments01:19

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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.
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Formation of Higher-order Actin Filaments01:11

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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.
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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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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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Structure and functions of profilins.

Kannan Krishnan1, Pierre D J Moens2

  • 1Centre for Bioactive Discovery in Health and Ageing, School of Science and Technology, University of New England, McClymont Bldg, Armidale, NSW, 2351, Australia.

Biophysical Reviews
|May 17, 2017
PubMed
Summary
This summary is machine-generated.

Profilins are essential actin-binding proteins regulating cell functions. Diverse isoforms exist, with varying ligand affinities, impacting their roles in cellular processes and disease, though their full significance remains under investigation.

Keywords:
Actin polymerizationPhosphoinositidesPoly-L-prolineProfilin

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Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • Profilins are small actin-binding proteins crucial for eukaryotic cell functions.
  • They regulate actin polymerization dynamics, membrane trafficking, and cell motility.
  • Profilins interact with polyphosphoinositides and proline-rich proteins, linking cytoskeleton and signaling pathways.

Purpose of the Study:

  • To explore the multifaceted roles of profilins in cellular processes.
  • To investigate the significance of different profilin isoforms and their ligand interactions.
  • To enhance understanding of profilin structure-function relationships.

Main Methods:

  • Structural studies of profilin isoforms with and without ligands (actin, poly-L-proline).
  • Analysis of structural stability to understand profilin/ligand interactions.
  • Review of existing literature on profilin functions and isoform diversity.

Main Results:

  • Profilins catalyze ADP/ATP exchange in actin, enhancing polymerization.
  • Interactions with polyphosphoinositides and proline-rich proteins link profilins to signaling and membrane trafficking.
  • Structural data reveals differences and similarities among profilin isoforms, aiding functional interpretation.

Conclusions:

  • Profilins are key regulators of diverse cellular activities, including development, motility, and trafficking.
  • Isoform-specific variations in ligand affinity suggest specialized functions.
  • Further structural and functional studies are vital to fully elucidate profilin's complex roles in health and disease.