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TitleStructure of the human frataxin-bound iron-sulfur cluster assembly complex provides insight into its activation mechanism.
Journal, issue, pagesNat Commun, Vol. 10, Issue 1, Page 2210, Year 2019
Publish dateMay 17, 2019
AuthorsNicholas G Fox / Xiaodi Yu / Xidong Feng / Henry J Bailey / Alain Martelli / Joseph F Nabhan / Claire Strain-Damerell / Christine Bulawa / Wyatt W Yue / Seungil Han /
PubMed AbstractThe core machinery for de novo biosynthesis of iron-sulfur clusters (ISC), located in the mitochondria matrix, is a five-protein complex containing the cysteine desulfurase NFS1 that is activated by ...The core machinery for de novo biosynthesis of iron-sulfur clusters (ISC), located in the mitochondria matrix, is a five-protein complex containing the cysteine desulfurase NFS1 that is activated by frataxin (FXN), scaffold protein ISCU, accessory protein ISD11, and acyl-carrier protein ACP. Deficiency in FXN leads to the loss-of-function neurodegenerative disorder Friedreich's ataxia (FRDA). Here the 3.2 Å resolution cryo-electron microscopy structure of the FXN-bound active human complex, containing two copies of the NFS1-ISD11-ACP-ISCU-FXN hetero-pentamer, delineates the interactions of FXN with other component proteins of the complex. FXN binds at the interface of two NFS1 and one ISCU subunits, modifying the local environment of a bound zinc ion that would otherwise inhibit NFS1 activity in complexes without FXN. Our structure reveals how FXN facilitates ISC production through stabilizing key loop conformations of NFS1 and ISCU at the protein-protein interfaces, and suggests how FRDA clinical mutations affect complex formation and FXN activation.
External linksNat Commun / PubMed:31101807 / PubMed Central
MethodsEM (single particle)
Resolution3.2 - 3.4 Å
Structure data

0560

6nzu

EMDB-0560, PDB-6nzu:
Structure of the human frataxin-bound iron-sulfur cluster assembly complex
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-0561:
Structure of the human frataxin-bound iron-sulfur cluster assembly complex
Method: EM (single particle) / Resolution: 3.4 Å

Chemicals

ChemComp-PLP:
PYRIDOXAL-5'-PHOSPHATE / Pyridoxal phosphate

ChemComp-8Q1:
S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate

ChemComp-ZN:
Unknown entry

Source
  • homo sapiens (human)
  • escherichia coli (E. coli)
KeywordsTRANSFERASE / OXIDOREDUCTASE / human frataxin-bound iron-sulfur cluster assembly complex

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