Self-resistance during muraymycin biosynthesis: A complementary nucleotidyltransferase and phosphotransferase with identical modification sites and distinct temporal order

Zheng Cui, Xia Chang Wang, Xiaodong Liu, Anke Lemke, Stefan Koppermann, Christian Ducho, Jürgen Rohr, Jon S. Thorson, Steven G. Van Lanen

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Muraymycins are antibacterial natural products from Streptomyces spp. that inhibit translocase I (MraY), which is involved in cell wall biosynthesis. Structurally, muraymycins consist of a 5=-C-glycyluridine (GlyU) appended to a 5-amino-5-deoxyribose (ADR), forming a disaccharide core that is found in several peptidyl nucleoside inhibitors of MraY. For muraymycins, the GlyU-ADR disaccharide is further modified with an aminopropyl-linked peptide to generate the simplest structures, annotated as the muraymycin D series. Two enzymes encoded in the muraymycin biosynthetic gene cluster, Mur29 and Mur28, were functionally assigned in vitro as a Mg·ATP-dependent nucleotidyltransferase and a Mg·ATP-dependent phosphotransferase, respectively, both modifying the 3-OH of the disaccharide. Biochemical characterization revealed that both enzymes can utilize several nucleotide donors as co-substrates and the acceptor substrate muraymycin also behaves as an inhibitor. Single-substrate kinetic analyses revealed that Mur28 preferentially phosphorylates a synthetic GlyU-ADR disaccharide, a hypothetical biosynthetic precursor of muraymycins, while Mur29 preferentially adenylates the D series of muraymycins. The adenylated or phosphorylated products have significantly reduced (170-fold and 51-fold, respectively) MraY inhibitory activities and reduced antibacterial activities, compared with the respective unmodified muraymycins. The results are consistent with Mur29-catalyzed adenylation and Mur28-catalyzed phosphorylation serving as complementary self-resistance mechanisms, with a distinct temporal order during muraymycin biosynthesis.

Original languageEnglish
Article numbere00193-18
JournalAntimicrobial Agents and Chemotherapy
Volume62
Issue number7
DOIs
StatePublished - Jul 2018

Bibliographical note

Publisher Copyright:
Copyright © 2018 American Society for Microbiology. All Rights Reserved.

Keywords

  • Antibiotic
  • Biosynthesis
  • MraY inhibitor
  • Nucleoside
  • Resistance
  • Translocase I

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases

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