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Related Concept Videos

Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
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Chemistry of Carbohydrates03:25

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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Cell Adhesion in Plants01:14

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Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
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Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
CAM Families
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Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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Cellulose-hemicellulose interactions - A nanoscale view.

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Glucuronoarabinoxylan binds strongest to cellulose nanocrystals, while Xyloglucan binds weakest. Hemicellulose structural integrity, not cellulose interface, dictates failure, with water weakening interactions.

Keywords:
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Area of Science:

  • Biomaterials Science
  • Computational Chemistry
  • Plant Biology

Background:

  • Hemicelluloses are crucial plant cell wall components influencing material properties.
  • Understanding hemicellulose-cellulose interactions is vital for biomass utilization.
  • Variability in hemicellulose structure impacts its functional performance.

Purpose of the Study:

  • To investigate the binding affinities of five distinct hemicellulose models to cellulose nanocrystals.
  • To elucidate the failure mechanisms under shear stress for hemicellulose-cellulose interactions.
  • To assess the influence of water on these interfacial interactions.

Main Methods:

  • Molecular dynamics simulations were employed to model hemicellulose-cellulose interactions.
  • Free energy calculations quantified binding strengths.
  • Simulated shear tests were conducted to determine failure points.

Main Results:

  • 4-O-Methylglucuronoarabinoxylan exhibited the highest binding free energy.
  • Fuco-Galacto-Xyloglucan displayed the lowest interaction energies.
  • Failure predominantly occurred within the hemicellulose fraction, not at the cellulose interface.
  • Water molecules were found to weaken hemicellulose-cellulose interactions by competing for hydrogen bonds.

Conclusions:

  • Hemicellulose structure significantly impacts binding strength to cellulose.
  • Intermolecular forces within hemicellulose are critical for structural integrity.
  • Water presence can negatively affect biomass component interactions, relevant for biorefinery processes.