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Actin Polymerization and Cell Motility

Actin Polymerization and Cell Motility

Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.

Microtubules in Cell Motility

Microtubules in Cell Motility

Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

Microtubules in Cell Motility

Microtubules in Cell Motility

Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

The Role of Actin and Myosin in Non-muscle Cells

The Role of Actin and Myosin in Non-muscle Cells

Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They are held...

Introduction to Actin

Introduction to Actin

Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution. Actin coding genes are conserved within species and across different species.

Cytoskeletal Coordination in Cell Migration

Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...

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Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Published on: July 30, 2014

Actina, un actor central en la forma y el movimiento de la célula.

Thomas D Pollard¹, John A Cooper

¹Department of Molecular, Cellular and Developmental Biology, Yale University, Post Office Box 208103, New Haven, CT 06520-8103, USA. thomas.pollard@yale.edu

Science (New York, N.Y.)

|December 8, 2009

Resumen

Los filamentos de actina proporcionan el apoyo mecánico celular esencial y el movimiento. Investigaciones adicionales sobre la actina.

Área de la Ciencia:

Biología celular Biología celular.
La biofísica es la biofísica.

Sus antecedentes:

La proteína actina forma filamentos cruciales para la estructura y la motilidad celular.
La dinámica de la actina es fundamental para diversos procesos celulares, incluida la detección de fuerza, la endocitosis, la migración celular y la citocinesis.
Estas complejas actividades celulares dependen de intrincadas interacciones entre los monómeros de actina, filamentos y varias proteínas asociadas.

Objetivo del estudio:

Para resumir las preguntas clave sin respuesta en la investigación relacionada con la actina.
Proponer metodologías para abordar estas cuestiones críticas en la biología celular.
Para resaltar la importancia de comprender los mecanismos moleculares de la actina.

Principales métodos:

Revisión de la literatura y síntesis de la investigación actual.

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Analyses of Actin Dynamics, Clutch Coupling and Traction Force for Growth Cone Advance

Analyses of Actin Dynamics, Clutch Coupling and Traction Force for Growth Cone Advance

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Identificación de brechas críticas de conocimiento en la biología de la actina.

Proponer futuras direcciones de investigación, incluido el modelado computacional y las imágenes de células vivas.

Principales resultados:

Se identificaron preguntas clave con respecto al papel de la actina en la mecánica y dinámica celular.
Se describieron estrategias para futuras investigaciones para dilucidar los mecanismos basados en la actina.
Hizo hincapié en la necesidad de enfoques integrados que combinan métodos experimentales y computacionales.

Conclusiones:

Comprender los fenómenos celulares basados en la actina requiere identificar todas las moléculas participantes.
Es esencial definir los mecanismos moleculares precisos de las interacciones de actina.
La integración de mediciones cuantitativas de células vivas con simulaciones computacionales dará importantes conocimientos sobre las funciones de la actina.