A Prodrug Resistance Mechanism Is Involved in Colibactin Biosynthesis and Cytotoxicity
摘要:
Commensal Escherichia coli residing in the human gut produce colibactin, a small-molecule genotoxin of unknown structure that has been implicated in the development of colon cancer. Colibactin biosynthesis is hypothesized to involve a prodnig resistance strategy that entails initiation of biosynthesis via construction of an N-terminal prodrug scaffold and late-stage cleavage of this structural motif during product export. Here we describe the biochemical characterization of the prodrug synthesis, elongation, and cleavage enzymes from the colibactin biosynthetic pathway. We show that nonribosomal peptide synthetases ClbN and ClbB assemble and process an N-acyl-D-asparagine prodrug scaffold that serves as a substrate for the periplasmic D-amino peptidase ClbP. In addition to affording information about structural features of colibactin, this work reveals the biosynthetic logic underlying the prodrug resistance strategy and suggests that cytotoxicity requires amide bond cleavage.
Repurposing the 3‐Isocyanobutanoic Acid Adenylation Enzyme SfaB for Versatile Amidation and Thioesterification
作者:Mengyi Zhu、Lijuan Wang、Jing He
DOI:10.1002/anie.202010042
日期:2021.1.25
molecules with novel skeletons, but also to identify the enzymes that catalyze diverse chemical reactions. Exploring the substrate promiscuity and catalytic mechanism of those biosynthetic enzymes facilitates the development of potential biocatalysts. SfaB is an acyladenylate‐forming enzyme that adenylates a unique building block, 3‐isocyanobutanoic acid, in the biosynthetic pathway of the diisonitrile
<i>N</i>-Carboxyanhydride-Mediated Fatty Acylation of Amino Acids and Peptides for Functionalization of Protocell Membranes
作者:Enver Cagri Izgu、Anders Björkbom、Neha P. Kamat、Victor S. Lelyveld、Weicheng Zhang、Tony Z. Jia、Jack W. Szostak
DOI:10.1021/jacs.6b08801
日期:2016.12.28
sulfide has been shown to generate short peptides via the formation of cyclic aminoacid N-carboxyanhydrides (NCAs). Here, we show that the polymerization of valine-NCA in the presence of fatty acids yields acylated aminoacids and peptides via a mixed anhydride intermediate. Notably, Nα-oleoylarginine, a product of the reaction between arginine and oleic acid in the presence of valine-NCA, partitions
A Capture Strategy for the Identification of Thio-Templated Metabolites
作者:Lauren A. Washburn、Keshav K. Nepal、Coran M. H. Watanabe
DOI:10.1021/acschembio.1c00437
日期:2021.9.17
Nonribosomal peptide synthetase and polyketide synthase systems are home to complex enzymology and produce compounds of great therapeutic value. Despite this, they have continued to be difficult to characterize due to their substrates remaining enzyme-bound by a thioester bond. Here, we have developed a strategy to directly trap and characterize the thioester-bound enzyme intermediates and applied the strategy
A Prodrug Resistance Mechanism Is Involved in Colibactin Biosynthesis and Cytotoxicity
作者:Carolyn A. Brotherton、Emily P. Balskus
DOI:10.1021/ja312154m
日期:2013.3.6
Commensal Escherichia coli residing in the human gut produce colibactin, a small-molecule genotoxin of unknown structure that has been implicated in the development of colon cancer. Colibactin biosynthesis is hypothesized to involve a prodnig resistance strategy that entails initiation of biosynthesis via construction of an N-terminal prodrug scaffold and late-stage cleavage of this structural motif during product export. Here we describe the biochemical characterization of the prodrug synthesis, elongation, and cleavage enzymes from the colibactin biosynthetic pathway. We show that nonribosomal peptide synthetases ClbN and ClbB assemble and process an N-acyl-D-asparagine prodrug scaffold that serves as a substrate for the periplasmic D-amino peptidase ClbP. In addition to affording information about structural features of colibactin, this work reveals the biosynthetic logic underlying the prodrug resistance strategy and suggests that cytotoxicity requires amide bond cleavage.