The O-Carbamoyl-Transferase Alb15 Is Responsible for the Modification of Albicidin

ACS Chemical Biology
Daniel PetrasRoderich D Süssmuth

Abstract

Albicidin is a potent antibiotic and phytotoxin produced by Xanthomonas albilineans which targets the plant and bacterial DNA gyrase. We now report on a new albicidin derivative which is carbamoylated at the N-terminal coumaric acid by the action of the ATP-dependent O-carbamoyltransferase Alb15, present in the albicidin (alb) gene cluster. Carbamoyl-albicidin was characterized by tandem mass spectrometry from cultures of a Xanthomonas overproducer strain and the gene function confirmed by gene inactivation of alb15 in X. albilineans. Expression of alb15 in Escherichia coli and in vitro reconstitution of the carbamoyltransferase activity confirmed albicidin as the substrate. The chemical synthesis of carbamoyl-albicidin finally enabled us to assess its bioactivity by means of in vitro gyrase inhibition and antibacterial assays. Compared to albicidin, carbamoyl-albicidin showed a significantly higher inhibitory efficiency against bacterial gyrase (∼8 vs 49 nM), which identifies the carbamoyl group as an important structural feature of albicidin maturation.

References

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Citations

Mar 23, 2017·Angewandte Chemie·Roderich D Süssmuth, Andi Mainz
Jun 27, 2017·Accounts of Chemical Research·Tam Dang, Roderich D Süssmuth
Aug 1, 2018·Natural Product Reports·Florian BaldewegMarkus Nett
Dec 14, 2019·Chemistry : a European Journal·Therese PlankeAndreas Kirschning
Aug 28, 2019·The Journal of Antibiotics·Saeed Mujahid Hashimi
Sep 7, 2017·Chemistry : a European Journal·Leonard von EckardsteinRoderich D Süssmuth
Jan 23, 2021·Chemistry : a European Journal·Tim SeedorfDanny Solga
Jul 3, 2021·Organic & Biomolecular Chemistry·Paige M E HawkinsRichard J Payne

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