6OJC

A high-resolution crystal structure of NocB thioesterase domain from Nocardicin cluster

Summary for 6OJC

• Entry DOI: 10.2210/pdb6ojc/pdb
• Descriptor: NocB, SULFATE ION, GLYCEROL, ... (4 entities in total)
• Functional Keywords: nonribosomal peptide synthetase (nrps), thioesterase, epimerization, alpha/beta hydrolase fold, hydrolase
• Biological source: Nocardia uniformis subsp. tsuyamanensis
• Total number of polymer chains: 1
• Total formula weight: 28412.35

Authors

Patel, K.D.,Gulick, A.M. (deposition date: 2019-04-11, release date: 2019-09-11, Last modification date: 2024-03-13)

Primary citation

Patel, K.D.,d'Andrea, F.B.,Gaudelli, N.M.,Buller, A.R.,Townsend, C.A.,Gulick, A.M.
Structure of a bound peptide phosphonate reveals the mechanism of nocardicin bifunctional thioesterase epimerase-hydrolase half-reactions.
Nat Commun, 10:3868-3868, 2019

PubMed Abstract: Nonribosomal peptide synthetases (NRPSs) underlie the biosynthesis of many natural products that have important medicinal utility. Protection of the NRPS peptide products from proteolysis is critical to these pathways and is often achieved by structural modification, principally the introduction of D-amino acid residues into the elongating peptide. These amino acids are generally formed in situ from their L-stereoisomers by epimerization domains or dual-function condensation/epimerization domains. In singular contrast, the thioesterase domain of nocardicin biosynthesis mediates both the effectively complete L- to D-epimerization of its C-terminal amino acid residue (≥100:1) and hydrolytic product release. We report herein high-resolution crystal structures of the nocardicin thioesterase domain in ligand-free form and reacted with a structurally precise fluorophosphonate substrate mimic that identify the complete peptide binding pocket to accommodate both stereoisomers. These structures combined with additional functional studies provide detailed mechanistic insight into this unique dual-function NRPS domain.

PubMed: 31455765
DOI: 10.1038/s41467-019-11740-6

Experimental method

X-RAY DIFFRACTION (1.94 Å)