7B3A image
Entry Detail
PDB ID:
7B3A
Keywords:
Title:
Crystal structure of PamZ
Biological Source:
PDB Version:
Deposition Date:
2020-11-30
Release Date:
2021-11-10
Method Details:
Experimental Method:
Resolution:
1.34 Å
R-Value Free:
0.18
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Putative Acyl-transferase domain protein
Chain IDs:A
Chain Length:280
Number of Molecules:1
Biological Source:Paenibacillus larvae subsp. larvae
Primary Citation
Molecular basis of antibiotic self-resistance in a bee larvae pathogen.
Nat Commun 13 2349 2349 (2022)
PMID: 35487884 DOI: 10.1038/s41467-022-29829-w

Abstact

Paenibacillus larvae, the causative agent of the devastating honey-bee disease American Foulbrood, produces the cationic polyketide-peptide hybrid paenilamicin that displays antibacterial and antifungal activity. Its biosynthetic gene cluster contains a gene coding for the N-acetyltransferase PamZ. We show that PamZ acts as self-resistance factor in Paenibacillus larvae by deactivation of paenilamicin. Using tandem mass spectrometry, nuclear magnetic resonance spectroscopy and synthetic diastereomers, we identified the N-terminal amino group of the agmatinamic acid as the N-acetylation site. These findings highlight the pharmacophore region of paenilamicin, which we very recently identified as a ribosome inhibitor. Here, we further determined the crystal structure of PamZ:acetyl-CoA complex at 1.34 Å resolution. An unusual tandem-domain architecture provides a well-defined substrate-binding groove decorated with negatively-charged residues to specifically attract the cationic paenilamicin. Our results will help to understand the mode of action of paenilamicin and its role in pathogenicity of Paenibacillus larvae to fight American Foulbrood.

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