Host-defense activities of cyclotides.
1Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia. d.craik@imb.uq.edu.au
Toxins
|April 5, 2012
Summary
Cyclotides, plant mini-proteins, show potential as novel pesticides by disrupting pest cell membranes. Research explores their insecticidal activities and production methods for agricultural applications.
Area of Science:
- Biochemistry
- Plant Science
- Pest Management
Background:
- Cyclotides are plant-derived mini-proteins with a unique cyclic structure and disulfide bonds.
- Their natural role is hypothesized to involve plant defense against pests and pathogens.
- These peptides are approximately 30 amino acids long, featuring a conserved cystine knot.
Purpose of the Study:
- To review the pesticidal and toxic activities of cyclotides.
- To investigate a potential common mechanism of action, focusing on membrane disruption in pests.
- To describe methods for producing cyclotides for use as novel pesticidal agents.
Main Methods:
- Literature review of studies reporting cyclotide bioactivity.
- Analysis of proposed mechanisms of action, particularly membrane disruption.
- Overview of biotechnological and chemical synthesis methods for cyclotide production.
Main Results:
- Cyclotides exhibit significant insecticidal and toxic effects against various pest species.
- Evidence suggests a common mechanism involving the disruption of biological membranes.
- Various production strategies, including recombinant expression and chemical synthesis, are feasible.
Conclusions:
- Cyclotides represent a promising class of natural compounds for developing new pesticides.
- Their membrane-disrupting activity offers a novel mode of action against agricultural pests.
- Further research into production and application is warranted for sustainable pest control.
More Related Videos
Related Concept Videos
01:10Drugs that Destabilize Microtubules
Microtubules are dynamic structures and can be regulated by microtubule targeting agents (MTAs). Microtubule destabilizing drugs are a class of MTAs that destabilize and prevent microtubules' polymerization. Both natural and synthetic chemicals can be found under this class of drugs. Vincristine and vinblastine, two vinca alkaloids, and colchicine were among the first to be discovered. These drugs can affect cells in various ways, either by inducing a change in cell morphology, preventing...
02:34Inhibition of CDK Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
02:34Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
01:15Drugs that Stabilize Microtubules
Microtubules are dynamic structures that undergo cycles of catastrophe and rescue. The microtubules play a central role in cell division by forming the spindle apparatus for segregating the chromosomes. This makes them ideal targets for regulating dividing cells in tumors and malignant cancer cells. Microtubule stabilizing drugs help stabilize the microtubule formation and promote its polymerization. Paclitaxel was the first microtubule stabilizing agent used as anticancer drug in chemotherapy...
01:09GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
01:23Inhibitors of Gram-positive Cell Wall Synthesis
Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...