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Issue 8, 2016
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A widespread bacterial phenazine forms S-conjugates with biogenic thiols and crosslinks proteins

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Abstract

Phenazines are redox-active compounds produced by a range of bacteria, including many pathogens. Endowed with various biological activities, these ubiquitous N-heterocycles are well known for their ability to generate reactive oxygen species by redox cycling. Phenazines may lead to an irreversible depletion of glutathione, but a detailed mechanism has remained elusive. Furthermore, it is not understood why phenazines have so many protein targets and cause protein misfolding as well as their aggregation. Here we report the discovery of unprecedented conjugates (panphenazines A, B) of panthetheine and phenazine-1-carboxylic (PCA) acid from a Kitasatospora sp., which prompted us to investigate their biogenesis. We found that PCA reacts with diverse biogenic thiols under radical-forming conditions, which provides a plausible model for irreversible glutathione depletion. To evaluate the scope of the reaction in cells we designed biotin and rhodamine conjugates for protein labelling and examined their covalent fusion with model proteins (ketosynthase, carbonic anhydrase III, albumin). Our results reveal important, yet overlooked biological roles of phenazines and show for the first time their function in protein conjugation and crosslinking.

Graphical abstract: A widespread bacterial phenazine forms S-conjugates with biogenic thiols and crosslinks proteins

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Publication details

The article was received on 01 Feb 2016, accepted on 13 Apr 2016 and first published on 14 Apr 2016


Article type: Edge Article
DOI: 10.1039/C6SC00503A
Citation: Chem. Sci., 2016,7, 4848-4855
  • Open access: Creative Commons BY-NC license
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    A widespread bacterial phenazine forms S-conjugates with biogenic thiols and crosslinks proteins

    D. Heine, S. Sundaram, M. Beudert, K. Martin and C. Hertweck, Chem. Sci., 2016, 7, 4848
    DOI: 10.1039/C6SC00503A

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