2MJD image
Entry Detail
PDB ID:
2MJD
Title:
Oxidized Yeast Adrenodoxin Homolog 1
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-01-07
Release Date:
2014-11-19
Method Details:
Experimental Method:
Conformers Calculated:
200
Conformers Submitted:
20
Selection Criteria:
target function
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Adrenodoxin homolog, mitochondrial
Chain IDs:A
Chain Length:115
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
Ligand Molecules
Primary Citation
Functional reconstitution of mitochondrial Fe/S cluster synthesis on Isu1 reveals the involvement of ferredoxin.
Nat Commun 5 5013 5013 (2014)
PMID: 25358379 DOI: 10.1038/ncomms6013

Abstact

Maturation of iron-sulphur (Fe/S) proteins involves complex biosynthetic machinery. In vivo synthesis of [2Fe-2S] clusters on the mitochondrial scaffold protein Isu1 requires the cysteine desulphurase complex Nfs1-Isd11, frataxin, ferredoxin Yah1 and its reductase Arh1. The roles of Yah1-Arh1 have remained enigmatic, because they are not required for in vitro Fe/S cluster assembly. Here, we reconstitute [2Fe-2S] cluster synthesis on Isu1 in a reaction depending on Nfs1-Isd11, frataxin, Yah1, Arh1 and NADPH. Unlike in the bacterial system, frataxin is an essential part of Fe/S cluster biosynthesis and is required simultaneously and stoichiometrically to Yah1. Reduced but not oxidized Yah1 tightly interacts with apo-Isu1 indicating a dynamic interaction between Yah1-apo-Isu1. Nuclear magnetic resonance structural studies identify the Yah1-apo-Isu1 interaction surface and suggest a pathway for electron flow from reduced ferredoxin to Isu1. Together, our study defines the molecular function of the ferredoxin Yah1 and its human orthologue FDX2 in mitochondrial Fe/S cluster synthesis.

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