TY - JOUR
T1 - Investigation of Amide Bond Formation during Dehydrophos Biosynthesis
AU - Ulrich, Emily C.
AU - Bougioukou, Despina J.
AU - Van Der Donk, Wilfred A.
N1 - Funding Information:
Funding was provided by National Institutes of Health Grant No. P01 GM077596 (to W.A.v.d.D.). NMR spectra were collected on a 600 MHz NMR spectrometer that was funded by NIH Grant No. S10-RR028833 located in the Carl R. Woese Institute for Genomic Biology Core Facility. We thank Z. Li of the Metabolomics Center, Roy J. Carver Biotechnology Center at the University of Illinois at Urbana−Champaign for performing the LCMS analysis and K. A. Wang for preliminary LCMS testing. We thank S. Martinis (UIUC) for providing the plasmid for LeuRS and LeuRS Y330A/D342A/D345A, Z. Huang for preparation of pET-15b valRS, and M. Ortega for preparation of T7 RNA polymerase. In addition, we thank M. Saks and A. Banerjee for helpful discussions and I. Bothwell and K. A. Wang for critically reviewing the manuscript.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/3/16
Y1 - 2018/3/16
N2 - Dehydrophos is a tripeptide phosphonate antibiotic produced by Streptomyces luridus. Its biosynthetic pathway involves the use of aminoacyl-tRNA (aa-tRNA) for amide bond formation. The first amide bond during biosynthesis is formed by DhpH-C, a peptidyltransferase that utilizes Leu-tRNA Leu . DhpH-C is a member of a burgeoning family of natural product biosynthetic enzymes that make use of aa-tRNA outside of canonical translation activities in the cell. Here, we used site-directed mutagenesis of both DhpH-C and tRNA Leu to investigate the enzyme mechanism and substrate specificity, respectively, and analyzed the substrate scope for the production of a set of dipeptides. DhpH-C appears to recognize both the amino acyl group on the tRNA and the tRNA acceptor stem, and the enzyme can accept other hydrophobic residues, in addition to leucine. These results contribute to a better understanding of enzyme-aa-tRNA interactions and the growing exploration of aa-tRNA usage beyond translation.
AB - Dehydrophos is a tripeptide phosphonate antibiotic produced by Streptomyces luridus. Its biosynthetic pathway involves the use of aminoacyl-tRNA (aa-tRNA) for amide bond formation. The first amide bond during biosynthesis is formed by DhpH-C, a peptidyltransferase that utilizes Leu-tRNA Leu . DhpH-C is a member of a burgeoning family of natural product biosynthetic enzymes that make use of aa-tRNA outside of canonical translation activities in the cell. Here, we used site-directed mutagenesis of both DhpH-C and tRNA Leu to investigate the enzyme mechanism and substrate specificity, respectively, and analyzed the substrate scope for the production of a set of dipeptides. DhpH-C appears to recognize both the amino acyl group on the tRNA and the tRNA acceptor stem, and the enzyme can accept other hydrophobic residues, in addition to leucine. These results contribute to a better understanding of enzyme-aa-tRNA interactions and the growing exploration of aa-tRNA usage beyond translation.
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U2 - 10.1021/acschembio.7b00949
DO - 10.1021/acschembio.7b00949
M3 - Article
C2 - 29303545
AN - SCOPUS:85044053971
SN - 1554-8929
VL - 13
SP - 537
EP - 541
JO - ACS chemical biology
JF - ACS chemical biology
IS - 3
ER -