viola cyclic peptides plant-derived cyclic peptides - viktoria-deann-peptides Cyclotides are naturally occurring peptides Viola Cyclic Peptides: Nature's Stable Antibacterial and Defense Molecules

vip-10-peptide Viola cyclic peptides, commonly known as cyclotides, represent a fascinating class of naturally occurring molecules primarily found in plants of the Violaceae family. These peptides are characterized by their unique head-to-tail cyclic structure and a stabilizing cystine knot motif, which grants them remarkable stability and a diverse range of biological activitiesThis study intends to partially solve this problem: key variables of the process are correlated to obtain a matrix ofdifferentiated cells ofViolatricolor, .... Research into Viola cyclic peptides has highlighted their potent antibacterial properties, particularly against Gram-negative bacteria, as well as their roles in plant defense mechanisms.Isolation and characterization of cyclotides from the leaves of ... Understanding these peptides offers insights into natural product chemistry and potential applications in medicine and agriculture.

The Structure and Stability of Cyclotides

The defining feature of Viola cyclic peptides is their macrocyclic backbone, formed by the head-to-tail ligation of the amino acid chainDiscovery and characterization of cyclotides, plant-based .... This cyclic nature, coupled with the presence of three conserved disulfide bonds creating a cyclic cystine knot (CCK), provides exceptional structural integrity.The cyclotide cycloviolacin O2 from Viola odoratahas potent bactericidal activity against Gram-negative bacteria. OBJECTIVES: To determine the antibacterial ... This stability allows cyclotides to withstand harsh environmental conditions and enzymatic degradation, a trait that has made them the subject of considerable scientific interest.作者：TJ Tyler·2021—The cyclotide cycloviolacin O2 from Viola odoratahas potent bactericidal activity against Gram-negative bacteria. J. Antimicrob. Chemother ... Unlike linear peptides, their circular architecture and the intricate knot of disulfide bonds contribute to their resistance to denaturation and proteolysis作者：M Trabi·2004·被引用次数：147—We provide evidence for at least 57 novel cyclotides present in a singleViolaspecies (Violahederacea). Furthermore, we have isolated one cyclotide expressed .... For example, cycloviolacin O2, a well-studied cyclotide from *Viola odorata*, demonstrates potent bactericidal activity, attributed in part to its stable structure.1 Ribosomally-synthesised cyclic peptides from plants as drug ...

Biological Activities and Defense Roles

The biological activities of Viola cyclic peptides are broad and continue to be explored.This study intends to partially solve this problem: key variables of the process are correlated to obtain a matrix ofdifferentiated cells ofViolatricolor, ... Their most documented function is as defense peptides, contributing to a plant's protection against pathogens and pests. The potent bactericidal activity observed in some cyclotides, such as cycloviolacin O2 against Gram-negative bacteria, suggests a crucial role in combating microbial infections. Beyond antimicrobial effects, certain cyclotides have also shown cytotoxic activity against human cell lines, hinting at potential applications in cancer research. Furthermore, research indicates that cyclotides may be involved in plant tolerance to heavy metals, with species from metallicolous populations of *Viola* exhibiting unique cyclotide production patterns linked to resistance mechanismsExpression of Viola cyclotides by liquid chromatography ....

Diversity and Discovery in Viola Species

The *Viola* genus, encompassing a wide array of species like *Viola philippica*, *Viola abyssinica*, *Viola odorata*, *Viola tricolor*, and *Viola biflora*, serves as a rich source for the discovery and characterization of novel cyclotides. Studies have identified a significant number of cyclotides across various *Viola* species, with some species yielding well over 50 unique sequences. The exploration of these plant sources, often through advanced analytical techniques like liquid chromatography and transcriptome analysis, continues to expand our knowledge of cyclotide diversity.Production of Cell Cultures from Viola Tricolor Plants and ... This ongoing discovery is crucial for understanding the evolutionary significance and ecological roles of these peptides.Viola “inconspicua” No More: An Analysis of Antibacterial ...

Potential Applications and Future Directions

The inherent stability and diverse bioactivities of Viola cyclic peptides position them as promising candidates for various applications. Their potent antimicrobial properties make them attractive for the development of new antibiotics, particularly in an era of rising antimicrobial resistance. The stability of cyclotides also makes them suitable for therapeutic applications where oral bioavailability is a challenge for traditional peptide drugs, suggesting their potential as novel plant-derived scaffolds for orally active peptide therapeuticsPlants from Violaceae produce cyclotides,peptidescharacterized by a circularpeptidebackbone and a cystine knot. This signature motif gives stability that .... Research into utilizing plant cell cultures for the synthesis of these peptides, as demonstrated with *Viola tricolor*, also opens avenues for sustainable and controlled production.作者：MY Yeshak·2011·被引用次数：64—Cyclotides, a family of approx. 50 mini-proteinsisolated from various Violaceae and Rubiaceae plants, are characterized by their circular peptide backbone and ... As our understanding of their structure-activity relationships deepens, further exploitation of these remarkable plant-derived molecules is anticipated.Isolation and characterization of cyclotides from the leaves of ...