Conserved Mechanism of 2'-Phosphorylation-Aided Amide Ligation in Peptidyl Nucleoside Biosynthesis.

Journal Article (Journal Article)

Peptidyl nucleoside antifungals, represented by nikkomycins and polyoxins, consist of an unusual six-carbon nucleoside [aminohexuronic acid (AHA)] ligated to a nonproteinogenic amino acid via an amide bond. A recent study suggested that AHA is biosynthesized through cryptic phosphorylation, where a 2'-phosphate is introduced early in the pathway and required to form AHA. However, whether 2'-phosphorylation is necessary for the last step of biosynthesis, the formation of the amide bond between AHA and nonproteinogenic amino acids, remains ambiguous. Here, we address this question with comprehensive in vitro and in vivo characterizations of PolG and NikS, which together provide strong evidence that amide ligation proceeds with 2'-phosphorylated substrates in both pathways. Our results suggest that 2'-phosphorylation is retained for the entirety of both nikkomycin and polyoxin biosynthesis, providing important insights into how cryptic phosphorylation assists with nucleoside natural product biosynthesis.

Full Text

Duke Authors

Cited Authors

  • Draelos, MM; Thanapipatsiri, A; Yokoyama, K

Published Date

  • July 20, 2021

Published In

Volume / Issue

  • 60 / 28

Start / End Page

  • 2231 - 2235

PubMed ID

  • 34242001

Pubmed Central ID

  • PMC8415103

Electronic International Standard Serial Number (EISSN)

  • 1520-4995

Digital Object Identifier (DOI)

  • 10.1021/acs.biochem.1c00327


  • eng

Conference Location

  • United States