Related Experiment Video
Updated: Jan 14, 2026

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
Published on: September 28, 2022
Side-Chain Macrocyclization in Ahp-Bicyclodepsipeptides Biosynthesis Involves Cytochrome P450-Catalyzed Sequential
Qiang Dong1, Niandi Zhang2, Xiaorong Chen1
1Zhongshan Institute for Drug Discovery, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Zhongshan, Guangdong, 528400, China.
Abstract:
We report the biosynthesis of FR901277 (1) and delmomycin A2 (2), two 3-amino-6-hydroxypiperidone (Ahp)-containing bicyclodepsipeptides featuring an N-C bridge linking the citrulline and tyrosine residues. This intriguing side-chain macrocyclization is catalyzed by Dlm16, a cytochrome P450 monooxygenase (CYP450), through a sequential process initiated by ortho-hydroxylation of the tyrosine ring, followed by intramolecular C─N coupling between the resulting catechol moiety and the terminal NH2 of the ureido group. Structure-function analyses and site-directed mutagenesis confirmed the catalytic importance of identified key residues, enabling the proposal of plausible macrocyclization mechanisms. Functional characterization of eight additional Dlm16 homologs further revealed a CYP450 subfamily capable of catalyzing C─N bond formation, underscoring the prevalence of this unusual macrocyclization in cyclodepsipeptide biosynthesis. Our work highlights nature's strategies for macrocycle construction and provides another example of CYP450-catalyzed C─N coupling via direct C─H functionalization.
More Related Videos
08:48Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation
Published on: January 26, 2016
11:09Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
Published on: August 1, 2018
Related Concept Videos
Cycloaddition Reactions: Overview
Aromatic Hydrocarbon Cations: Structural Overview
Removing one hydrogen from the intervening CH2 group...
ATP and Macromolecule Synthesis
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
Cationic Chain-Growth Polymerization: Mechanism
Amino Acid Biosynthetic Pathways
Radical Chain-Growth Polymerization: Chain Branching