Correction to: Nature https://doi.org/10.1038/s41586-019-1151-1 Published online 01 May 2019

In the Supplementary Information of this Letter, the following additions and corrections have been made: Gas chromatography–mass spectrometry (GC–MS) traces of control experiments without Fe2+ have been added as Supplementary Figs. S30 and S31. Supplementary Table S5 has been added to present the data obtained in the additional control experiments mentioned above. Some misaligned entries have been corrected in Supplementary Tables S2 and S4 and numerical values in these tables are now expressed in scientific notation for clarity. None of these changes affects the data plots, results, or conclusions of the original paper. The Supplementary Information of the original Article has been corrected online. The Supplementary Information of this Amendment contains the old, incorrect Supplementary information for transparency.

Supplementary information is available in the online version of this Amendment.