5H29 image
Deposition Date 2016-10-14
Release Date 2017-11-22
Last Version Date 2024-11-06
Entry Detail
PDB ID:
5H29
Keywords:
Title:
Crystal Structure of the NTD_N/C domain of Alkylhydroperoxide Reductase AhpF from Enterococcus Faecalis (V583)
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 41 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Thioredoxin reductase/glutathione-related protein
Gene (Uniprot):EF_2738
Chain IDs:A
Chain Length:218
Number of Molecules:1
Biological Source:Enterococcus faecalis
Primary Citation
Novel insights into the vancomycin-resistant Enterococcus faecalis (V583) alkylhydroperoxide reductase subunit F
Biochim. Biophys. Acta 1861 3201 3214 (2017)
PMID: 28935609 DOI: 10.1016/j.bbagen.2017.09.011

Abstact

The ability of the vancomycin-resistant Enterococcus faecalis (V583) to restore redox homeostasis via antioxidant defense mechanism is of importance, and knowledge into this defense is essential to understand its antibiotic-resistance and survival in hosts. The flavoprotein disulfide reductase AhpR, composed of the subunits AhpC and AhpF, represents one such vital part. Circular permutation was found to be a feature of the AhpF protein family. E. faecalis (V583) AhpF (EfAhpF) appears to be a representative of a minor subclass of this family, the typically N-terminal two-fold thioredoxin-like domain (NTD_N/C) is located at the C-terminus, whereas the pyridine nucleotide-disulfide oxidoreductase domain is encoded in the N-terminal part of its sequence. In EfAhpF, these two domains are connected via an unusually long linker region providing optimal communication between both domains. EfAhpF forms a dimer in solution similar to Escherichia coli AhpF. The crystallographic 2.3Å resolution structure of the NTD_N/C domain reveals a unique loop-helix stretch (409ILKDTEPAKELLYGIEKM426) not present in homologue domains of other prokaryotic AhpFs. Deletion of the unique 415PAKELLY421-helix or of 415PAKELL420 affects protein stability or attenuates peroxidase activity. Furthermore, mutation of Y421 is described to be essential for E. faecalis AhpF's optimal NADH-oxidative activity.

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