7EMY image
Entry Detail
PDB ID:
7EMY
EMDB ID:
Keywords:
Title:
Pyochelin synthetase, a dimeric nonribosomal peptide synthetase elongation module
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2021-04-15
Release Date:
2021-12-22
Method Details:
Experimental Method:
Resolution:
2.97 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Dihydroaeruginoic acid synthetase
Chain IDs:A, B
Chain Length:1455
Number of Molecules:2
Biological Source:Pseudomonas aeruginosa PAO1
Primary Citation
Catalytic trajectory of a dimeric nonribosomal peptide synthetase subunit with an inserted epimerase domain.
Nat Commun 13 592 592 (2022)
PMID: 35105906 DOI: 10.1038/s41467-022-28284-x

Abstact

Nonribosomal peptide synthetases (NRPSs) are modular assembly-line megaenzymes that synthesize diverse metabolites with wide-ranging biological activities. The structural dynamics of synthetic elongation has remained unclear. Here, we present cryo-EM structures of PchE, an NRPS elongation module, in distinct conformations. The domain organization reveals a unique "H"-shaped head-to-tail dimeric architecture. The capture of both aryl and peptidyl carrier protein-tethered substrates and intermediates inside the heterocyclization domain and L-cysteinyl adenylate in the adenylation domain illustrates the catalytic and recognition residues. The multilevel structural transitions guided by the adenylation C-terminal subdomain in combination with the inserted epimerase and the conformational changes of the heterocyclization tunnel are controlled by two residues. Moreover, we visualized the direct structural dynamics of the full catalytic cycle from thiolation to epimerization. This study establishes the catalytic trajectory of PchE and sheds light on the rational re-engineering of domain-inserted dimeric NRPSs for the production of novel pharmaceutical agents.

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Primary Citation of related structures