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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.
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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.
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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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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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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.
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Fine structure of P-protein filaments from Ricinus communis.

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Electron microscopy revealed two main fibrillar components in Ricinus communis L. phloem exudate, with diameters of 20 nm and 14 nm, suggesting a structural relationship between these plant phloem sieve elements.

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Microscopy

Background:

  • Phloem exudate contains complex fibrillar structures.
  • Understanding these structures is crucial for plant physiology.

Purpose of the Study:

  • To characterize the filamentous components of Ricinus communis L. phloem exudate.
  • To compare these components with those in fixed sieve elements.

Main Methods:

  • Negative staining and electron microscopy of phloem exudate.
  • Analysis of fixed and sectioned sieve elements.
  • Ultracentrifugation of exudate followed by thin sectioning.

Main Results:

  • Two primary fibrillar components observed: 20 nm and 14 nm in diameter.
  • The 14 nm fibrils exhibit projections, suggesting a unique structure.
  • Structural similarities found between exudate fibrils and those in sieve elements of Ricinus and Acer rubrum.
  • 20 nm fibrils appear to have a solid core.

Conclusions:

  • The observed fibrillar components in Ricinus phloem exudate are structurally related.
  • These findings provide insights into the composition and potential function of sieve elements.
  • Further research may elucidate models for the 20 nm filament structure.