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Biochemistry. 2016 Aug 2;55(30):4131-4. doi: 10.1021/acs.biochem.6b00598. Epub 2016 Jul 21.

SkfB Abstracts a Hydrogen Atom from Cα on SkfA To Initiate Thioether Cross-Link Formation.

Author information

1
Chemistry Department, University of Utah , Salt Lake City, Utah 84112, United States.

Abstract

Sulfur to α-carbon thioether-containing peptides (sactipeptides) are ribosomally synthesized post-translationally modified peptides with bacteriocidal activities. The thioether cross-link, which is required for biological activity, is installed by a member of the radical S-adenosyl-l-methionine (SAM) superfamily in the peptide substrate. Herein, we show that the radical SAM enzyme, SkfB, utilizes the 5'-deoxyadenosyl radical generated from the reductive cleavage of SAM to abstract a hydrogen atom from the α-carbon of the amino acid at position 12 in the substrate, SkfA, to initiate the installation of a thioether cross-link. The insights from this work can be applied to all radical SAM sactipeptide maturases.

PMID:
27410522
PMCID:
PMC5282607
DOI:
10.1021/acs.biochem.6b00598
[Indexed for MEDLINE]
Free PMC Article

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