7PPZ image
Entry Detail
PDB ID:
7PPZ
Keywords:
Title:
Crystal structure of the Burkholderia Lethal Factor 1 (BLF1) C94S inactive mutant in complex with human eIF4A - Crystal form A
Biological Source:
PDB Version:
Deposition Date:
2021-09-15
Release Date:
2022-04-13
Method Details:
Experimental Method:
Resolution:
2.52 Å
R-Value Free:
0.27
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Burkholderia Lethal Factor 1 (BLF1)
Mutations:C94S
Chain IDs:A
Chain Length:211
Number of Molecules:1
Biological Source:Burkholderia pseudomallei (strain K96243)
Polymer Type:polypeptide(L)
Description:Eukaryotic initiation factor 4A-I
Chain IDs:B
Chain Length:394
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Molecular basis of specificity and deamidation of eIF4A by Burkholderia Lethal Factor 1.
Commun Biol 5 272 272 (2022)
PMID: 35347220 DOI: 10.1038/s42003-022-03186-2

Abstact

Burkholderia pseudomallei lethal factor 1 (BLF1) exhibits site-specific glutamine deamidase activity against the eukaryotic RNA helicase, eIF4A, thereby blocking mammalian protein synthesis. The structure of a complex between BLF1 C94S and human eIF4A shows that the toxin binds in the cleft between the two RecA-like eIF4A domains forming interactions with residues from both and with the scissile amide of the target glutamine, Gln339, adjacent to the toxin active site. The RecA-like domains adopt a radically twisted orientation compared to other eIF4A structures and the nature and position of conserved residues suggests this may represent a conformation associated with RNA binding. Comparison of the catalytic site of BLF1 with other deamidases and cysteine proteases reveals that they fall into two classes, related by pseudosymmetry, that present either the re or si faces of the target amide/peptide to the nucleophilic sulfur, highlighting constraints in the convergent evolution of their Cys-His active sites.

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