Related Experiment Video
Updated: Jun 21, 2026
11:06
Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
Published on: October 16, 2017
The structure, function, and biosynthesis of plant cell wall pectic polysaccharides.
Kerry Hosmer Caffall1, Debra Mohnen
1University of Georgia, Department of Biochemistry and Molecular Biology and Complex Carbohydrate Research Center, Athens, 30602, United States.
Carbohydrate Research
|July 21, 2009
Summary
Plant cell walls rely on pectin polysaccharides, defined by galacturonic acid, for growth and development. Understanding pectin biosynthesis is key for plant science and industrial applications.
Area of Science:
- Plant Biology
- Biochemistry
- Molecular Biology
Background:
- Plant cell walls are crucial for plant growth and development, composed mainly of carbohydrates (approx. 90%), proteins, and aromatic compounds.
- Polysaccharides like cellulose, hemicellulose, and pectin are key carbohydrate components, with pectins being most abundant in primary cell walls and middle lamellae.
- Pectins are defined by the presence of galacturonic acid and include galacturonans and rhamnogalacturonan-I, featuring alpha-1,4-linked galacturonic acid backbones.
Purpose of the Study:
- To present a detailed synopsis of existing literature on pectin structure, function, and biosynthesis.
- To highlight the importance of identifying glycosyltransferases involved in pectin synthesis.
- To underscore the significance of pectin research for plant growth, development, and industrial applications.
Main Methods:
- Literature review and synthesis of existing research on pectin polysaccharides.
- Analysis of pectin structure, including backbone composition (alpha-1,4-linked galacturonic acid).
- Discussion of the role of glycosyltransferases in pectin biosynthesis.
Main Results:
- Pectins are a diverse class of polysaccharides critical for plant cell wall integrity and function.
- Galacturonans, a type of pectin, are characterized by a backbone of alpha-1,4-linked galacturonic acid.
- The identification of specific glycosyltransferases is crucial for understanding pectin synthesis pathways.
Conclusions:
- A comprehensive understanding of pectin structure and biosynthesis is essential for advancing plant science.
- Research into pectin synthesis is vital for optimizing the use of plant polysaccharides in industry and for human health.
- Glycosyltransferases play a pivotal role in the formation of pectin, influencing plant cell wall properties.
Related Concept Videos
01:15Cellulose and Pectic Polysaccharides
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.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
02:43Plant Cell Wall
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.Collenchyma and sclerenchyma cells, on the other hand, mainly occur in the outer layers of a plant's stems and leaves. These cells provide the plant with strength and support by either partially thickening their primary cell wall (i.e., collenchyma), or depositing a...
01:07Plant Cell Wall
Plant cells have a cell wall, a rigid outer covering that protects the cell and provides shape and support. During cell division, a mixture of enzymes, proteins, and glucose molecules is transported via vesicles to the center of the cell. These vesicles continuously fuse and build a cell plate between the dividing cells. As the cell plate matures, new polysaccharides are added to it to form the cell walls of the daughter cells. The predominant polysaccharide in the cell wall is cellulose, made...
01:14Cell Adhesion in Plants
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.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
01:02Role of Microtubules in Cell Wall Deposition
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 disassembly and...
01:26Biosynthesis of Polysaccharides
Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...