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

Conserved Mechanism of 2'-Phosphorylation-Aided Amide Ligation in Peptidyl Nucleoside Biosynthesis.
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DOI:
10.1021/acs.biochem.1c00327
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发表时间:
2021-07-20
期刊:
影响因子:
2.9
通讯作者:
Yokoyama K
Yokoyama K
中科院分区:
生物学3区
文献类型:
--
作者:
Draelos MM;Thanapipatsiri A;Yokoyama K

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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.
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