Related Experiment Video
Updated: Jun 5, 2026
08:02
Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
Published on: May 5, 2022
The filamins: organizers of cell structure and function.
Fumihiko Nakamura1, Thomas P Stossel, John H Hartwig
1Translational Medicine Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. fnakamura@rics.bwh.harvard.edu
Cell Adhesion & Migration
|December 21, 2010
Summary
Filamin A (FLNa) is a key protein in cell structure and function. Research shows its diverse roles and binding partners, with mutations causing various human diseases.
Area of Science:
- Biochemistry
- Cell Biology
- Genetics
Background:
- Filamin A (FLNa) is a crucial non-muscle actin cross-linking protein identified in 1975.
- Extensive research has detailed FLNa's structure, isoforms (FLNb, FLNc), and over 90 binding partners.
- Mutations in FLN genes lead to diverse human anomalies with significant health consequences.
Purpose of the Study:
- This review synthesizes current knowledge on Filamin A.
- Focuses on the structure and function of FLNa.
- Highlights FLNa's roles in cell migration and adhesion.
Main Methods:
- Literature review and synthesis of existing research on Filamin A.
- Analysis of structural and functional data.
- Examination of binding partner interactions and mutation-associated phenotypes.
Main Results:
- FLNa possesses a complex structure enabling interactions with numerous cellular components.
- FLNa plays a vital role in regulating cell migration and adhesion processes.
- Over 90 binding partners identified, including channels, receptors, signaling molecules, and transcription factors.
Conclusions:
- Filamin A is a multifunctional protein essential for cellular integrity and dynamics.
- Understanding FLNa's structure-function relationship is critical for deciphering its role in health and disease.
- Further research into FLNa is warranted given its implications in human genetic disorders.
Related Concept Videos
01:18Assembly of Cytoskeletal Filaments
Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
01:12Adaptability of Cytoskeletal Filaments
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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...
01:33Introduction to the Cytoskeleton
Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶ microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their homologs were...
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶ microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their homologs were...
01:19The 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...
Intermediate filaments...
01:11Formation 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 high-order actin networks...