Describe actin filaments
long, thin protein strands, about 7nm in diameter and is responsible for cell movement
Actin filaments are thin, flexible protein filaments found in the cytoplasm of eukaryotic cells. They are composed of actin, a globular protein that can polymerize into long, fibrous strands. Actin filaments are involved in a variety of cellular processes, including cell motility, muscle contraction, vesicle transport, and cell division.
Actin filaments are typically 7-9 nm in diameter and vary in length depending on the specific cell type and function. They are dynamic structures that can rapidly assemble and disassemble, allowing cells to quickly reorganize their cytoskeleton as needed. Polymerization of actin filaments is promoted by the binding of ATP, and hydrolysis of ATP to ADP promotes depolymerization.
Actin filaments are typically organized into networks and bundles that are anchored to the plasma membrane, organelles, or other cytoskeletal structures. These networks and bundles provide mechanical support for the cell and allow for cellular movements such as filopodia extension during migration.
Overall, actin filaments play a crucial role in the structure and function of eukaryotic cells, and defects in actin dynamics can lead to various diseases and disorders.
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