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Microfilaments are
Option: 1
Structural in function
Option: 2
Made up of two intertwined strands of F-actin
Option: 3
Formed through the process of polymerization
Option: 4
All are correct
Answers (1)
The Cytoskeleton
- Cytoskeleton refers to the network of protein fibres that help in maintaining the shape of the cell and help in the movement of the cell.
- There are three types of protein fibres within cytoskeleton:
- microfilaments,
- intermediate filaments, and
- microtubules
Microfilaments
- These are the narrowest fibres made up of two intertwined strands of F-actin protofilaments. They are also called actin filaments.
- F-actin protofilaments are made up of G-actin subunit.
- F-actin is the filamentous actin while G-actin is the globular actin.
- The individual strands of F-actin protofilaments are wound together with the help of tropomyosin.
- Tropomyosin is a double-stranded alpha-helical coiled-coil protein.
- It bears a protein complex, called troponin, which is interspersed along the length of the coil.
Functions of Microfilaments:
- Microfilaments provide shape and rigidity to the cells. They can depolymerize (disassemble) and reform quickly, thus enabling a cell to change its shape and move.
Microfilaments are the narrowest fibres made up of two intertwined strands of Factin
protofilaments. F-actin protofilaments are made up of G-actin subunit. F-actin is the
filamentous actin while G-actin is the globular actin.
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