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Title: Molecular basis for the broad substrate selectivity of a peptide prenyltransferase

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

The cyanobactin prenyltransferases catalyze a series of known or unprecedented reactions on millions of different substrates, with no easily observable recognition motif and exquisite regioselectivity. Here we define the basis of broad substrate tolerance for the otherwise uncharacterized TruF family. We determined the structures of the Tyr-prenylating enzyme PagF, in complex with an isoprenoid donor analog and a panel of linear and macrocyclic peptide substrates. Unexpectedly, the structures reveal a truncated barrel fold, wherein binding of large peptide substrates is necessary to complete a solvent-exposed hydrophobic pocket to form the catalytically competent active site. Kinetic, mutational, chemical, and computational analyses revealed the structural basis of selectivity, showing a small motif within peptide substrates that is sufficient for recognition by the enzyme. Attaching this 2-residue motif to two random peptides results in their isoprenylation by PagF, demonstrating utility as a general biocatalytic platform for modifications on any peptide substrate.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Institutes of Health (NIH)
Grant/Contract Number:
GM102602; GM103219
OSTI ID:
1335987
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 113, Issue 49; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (3)

Molecular Insight into the Mg 2+ -Dependent Allosteric Control of Indole Prenylation by Aromatic Prenyltransferase AmbP1 journal May 2018
Molecular Insight into the Mg 2+ -Dependent Allosteric Control of Indole Prenylation by Aromatic Prenyltransferase AmbP1 journal May 2018
Parallel lives of symbionts and hosts: chemical mutualism in marine animals journal January 2018