8B0N image
Entry Detail
PDB ID:
8B0N
EMDB ID:
Keywords:
Title:
Cryo-EM structure of apolipoprotein N-acyltransferase Lnt from E. coli in complex with Lyso-PE
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-09-07
Release Date:
2023-07-12
Method Details:
Experimental Method:
Resolution:
2.67 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Apolipoprotein N-acyltransferase
Chain IDs:A
Chain Length:532
Number of Molecules:1
Biological Source:Escherichia coli K-12
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
P1L A CYS modified residue
Ligand Molecules
Primary Citation
Structure snapshots reveal the mechanism of a bacterial membrane lipoprotein N -acyltransferase.
Sci Adv 9 eadf5799 eadf5799 (2023)
PMID: 37390210 DOI: 10.1126/sciadv.adf5799

Abstact

Bacterial lipoproteins (BLPs) decorate the surface of membranes in the cell envelope. They function in membrane assembly and stability, as enzymes, and in transport. The final enzyme in the BLP synthesis pathway is the apolipoprotein N-acyltransferase, Lnt, which is proposed to act by a ping-pong mechanism. Here, we use x-ray crystallography and cryo-electron microscopy to chart the structural changes undergone during the progress of the enzyme through the reaction. We identify a single active site that has evolved to bind, individually and sequentially, substrates that satisfy structural and chemical criteria to position reactive parts next to the catalytic triad for reaction. This study validates the ping-pong mechanism, explains the molecular bases for Lnt's substrate promiscuity, and should facilitate the design of antibiotics with minimal off-target effects.

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Primary Citation of related structures