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Cyclic peptides in plants are synthesized via a two-step process; the translation of a linear peptide chain, and its subsequent formation into a cyclic structure through activities of a protease-like enzyme or other ways. [6] [7] [8] Some peptides, such as cyclotides, are gene-coded products obtained by the processing of larger precursor proteins.
A number of natural antimicrobial peptides are cyclic, and the products of SICLOPPS are "increasingly viewed as ideal backbones for modulation of protein-protein interactions." [3] Circular peptides tend to be resistant to protease activity, and may be suitable for use as orally administered drugs.
The stunting effect of kalata B1 cyclic peptide on growth and development of Helicoverpa punctigera, a caterpillar from the Lepidopteran order. [6]Cyclotides have been reported to have a wide range of biological activities, including anti-HIV, insecticidal, anti-tumour, antifouling, anti-microbial, hemolytic, neurotensin antagonism, trypsin inhibition, and uterotonic activities.
Crystal structure of an extracellular segment of integrin alphaVbeta3 complexed with a cyclic peptide containing the arginyl-glycyl-aspartic acid (RGD) sequence. RGD is shown in maroon. CEND-1, also known as iRGD, is a cyclic peptide that homes to tumors via binding to integrin alpha V receptors. [22]
These peptides are often cyclic and can have highly complex cyclic structures, although linear nonribosomal peptides are also common. Since the system is closely related to the machinery for building fatty acids and polyketides , hybrid compounds are often found.
This page was last edited on 6 September 2021, at 23:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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