5NHG image
Deposition Date 2017-03-21
Release Date 2018-05-16
Last Version Date 2024-11-13
Entry Detail
PDB ID:
5NHG
Keywords:
Title:
Crystal structure of the human dihydrolipoamide dehydrogenase
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
Resolution:
2.27 Å
R-Value Free:
0.20
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Dihydrolipoyl dehydrogenase, mitochondrial
Gene (Uniprot):DLD
Chain IDs:A, B, C, D, E, F, G, H
Chain Length:495
Number of Molecules:8
Biological Source:Homo sapiens
Primary Citation
Crystal structures of the disease-causing D444V mutant and the relevant wild type human dihydrolipoamide dehydrogenase.
Free Radic. Biol. Med. 124 214 220 (2018)
PMID: 29908278 DOI: 10.1016/j.freeradbiomed.2018.06.008

Abstact

We report the crystal structures of the human (dihydro)lipoamide dehydrogenase (hLADH, hE3) and its disease-causing homodimer interface mutant D444V-hE3 at 2.27 and 1.84 Å resolution, respectively. The wild type structure is a unique uncomplexed, unliganded hE3 structure with the true canonical sequence. Based on the structural information a novel molecular pathomechanism is proposed for the impaired catalytic activity and enhanced capacity for reactive oxygen species generation of the pathogenic mutant. The mechanistic model involves a previously much ignored solvent accessible channel leading to the active site that might be perturbed also by other disease-causing homodimer interface substitutions of this enzyme.

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Primary Citation of related structures