Partial depolymerization of genetically modified potato tuber periderm reveals intermolecular linkages in suberin
José Graça1, Vanessa Cabral1, Sara Santos1
1Instituto Superior de Agronomia, Centro de Estudos Florestais, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Phytochemistry
|June 22, 2015
Summary
Researchers identified key building blocks in potato suberin, revealing how this plant biopolyester assembles. Understanding suberin structure impacts plant barrier function and development.
Area of Science:
- Plant Biology
- Biochemistry
- Polymer Science
Background:
- Suberin is a crucial plant biopolyester in protective tissues.
- Its macromolecular assembly mechanism remains poorly understood.
- Previous studies focused on composition rather than linkage.
Purpose of the Study:
- To elucidate the monomeric linkages and structure of suberin macromolecules.
- To investigate the role of specific suberin biosynthesis genes in assembly.
Main Methods:
- Partial depolymerization of potato suberin.
- Analysis of solubilized oligomers using ESI-MS/MS and high-resolution NMR.
- Comparative analysis of wild-type and gene-silenced potato periderms (StKCS6, CYP86A33, FHT).
Main Results:
- Identified two key suberin building blocks: glycerol-α,ω-diacid-glycerol and glycerol-ω-hydroxyacid-ferulic acid.
- CYP86A33 silencing disrupted acylglycerol structures and suberin production.
- StKCS6 silencing had minor effects, indicating limited role of very-long chain fatty acids.
- FHT silencing reduced ferulate linkages and increased polyphenolic units.
Conclusions:
- Suberin assembly involves specific glycerol-based units forming the aliphatic polyester and anchoring to aromatics.
- CYP86A33 is vital for typical suberin lamellar organization.
- Gene silencing provides insights into the functional roles of suberin components.
Related Concept Videos
01:20Types of Step-Growth Polymers: Polyesters
2.7K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
2.7K
01:14Polymer Classification: Architecture
4.1K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
4.1K
01:15Hydrolysis
124.8K
Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
124.8K
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
10.3K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
10.3K
01:01Phosphodiester Linkages
114.5K
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
114.5K
01:28Microbial Bioremediation of Plastics
83
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
83