The PqqD homologous domain of the radical SAM enzyme ThnB is required for thioether bond formation during thurincin H maturation - PubMed (original) (raw)

. 2015 Jul 8;589(15):1802-6.

doi: 10.1016/j.febslet.2015.05.032. Epub 2015 May 27.

Affiliations

Free article

The PqqD homologous domain of the radical SAM enzyme ThnB is required for thioether bond formation during thurincin H maturation

Beata M Wieckowski et al. FEBS Lett. 2015.

Free article

Abstract

Thurincin H is a 31-residue, ribosomally synthesized bacteriocin originating from the thn operon of Bacillus thuringiensis SF361. It is the only known sactipeptide carrying four thioether bridges between four cysteines and the α-carbons of a serine, an asparagine and two threonine residues. By analysis of the thn operon and use of in vitro studies we now reveal that ThnB is a radical S-adenosylmethionine (SAM) enzyme containing two [4Fe-4S] clusters. Furthermore, we confirm the involvement of ThnB in the formation of the thioether bonds present within the structure of thurincin H. Finally, we show that the PqqD homologous N-terminal domain of ThnB is essential for maturation of the thurincin H precursor peptide, but not for the SAM cleavage activity of ThnB.

Keywords: Biosynthesis; Natural product; Radical SAM enzyme; Ribosomal peptide; Sactipeptide; [4Fe–4S] cluster.

Copyright © 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

PubMed Disclaimer

Similar articles

Cited by

Publication types

MeSH terms

Substances

LinkOut - more resources