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Related Concept Videos

The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

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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.
Intermediate...
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Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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What is Conservation Biology?01:57

What is Conservation Biology?

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Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials.
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Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

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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...
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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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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...
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Related Experiment Video

Updated: Feb 13, 2026

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
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Filamentous Phage: Structure and Biology.

Jasna Rakonjac1,2, Marjorie Russel3, Sofia Khanum4

  • 1Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand. j.rakonjac@massey.ac.nz.

Advances in Experimental Medicine and Biology
|March 18, 2018
PubMed
Summary

Filamentous phage (Ff) are crucial for phage display and protein evolution due to high yields, large library sizes, and robust virion stability. Their biology and life cycle are key to successful phage display applications.

Keywords:
BacteriophageFf life cycleFf structureFilamentous phageInfection mechanismPhage display

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Virology

Background:

  • Ff filamentous phage (fd, M13, f1) have dominated phage display for 30 years.
  • Their dominance is due to high titers (100x others), efficient transformation for large libraries, and virion stability under harsh conditions.

Purpose of the Study:

  • To provide an overview of Ff filamentous phage structure and biology.
  • To emphasize properties relevant to phage display applications and phage-assisted continual protein evolution (PACE).

Main Methods:

  • Review of existing literature on Ff phage biology and applications.
  • Emphasis on virion properties and life cycle pertinent to phage display.

Main Results:

  • Ff phage exhibit high titers, enabling large library construction.
  • Superior virion stability allows for diverse biopanning conditions.
  • Understanding of Ff phage infection and assembly underpins PACE strategies.

Conclusions:

  • Ff filamentous phage are versatile tools in biotechnology.
  • Their inherent properties make them ideal for phage display and protein evolution.
  • Further understanding of their biology enhances their application scope.