2N5I image
Entry Detail
PDB ID:
2N5I
Title:
PltL-pyrrolyl
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2015-07-17
Release Date:
2015-09-16
Method Details:
Experimental Method:
Conformers Calculated:
20
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peptidyl carrier protein PltL
Chain IDs:A
Chain Length:90
Number of Molecules:1
Biological Source:Pseudomonas protegens Pf-5
Ligand Molecules
Primary Citation
Structure and Substrate Sequestration in the Pyoluteorin Type II Peptidyl Carrier Protein PltL.
J.Am.Chem.Soc. 137 11546 11549 (2015)
PMID: 26340431 DOI: 10.1021/jacs.5b04525

Abstact

Type II nonribosomal peptide synthetases (NRPS) generate exotic amino acid derivatives that, combined with additional pathways, form many bioactive natural products. One family of type II NRPSs produce pyrrole moieties, which commonly arise from proline oxidation while tethered to a conserved, type II peptidyl carrier protein (PCP), as exemplified by PltL in the biosynthesis of pyoluteorin. We sought to understand the structural role of pyrrole PCPs in substrate and protein interactions through the study of pyrrole analogs tethered to PltL. Solution-phase NMR structural analysis revealed key interactions in residues of helix II and III with a bound pyrrole moiety. Conservation of these residues among PCPs in other pyrrole containing pathways suggests a conserved mechanism for formation, modification, and incorporation of pyrrole moieties. Further NOE analysis provided a unique pyrrole binding motif, offering accurate substrate positioning within the cleft between helices II and III. The overall structure resembles other PCPs but contains a unique conformation for helix III. This provides evidence of sequestration by the PCP of aromatic pyrrole substrates, illustrating the importance of substrate protection and regulation in type II NRPS systems.

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Primary Citation of related structures