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- PDB-8pka: Structure of the human mitochondrial iron-sulfur cluster biosynth... -

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Basic information

Entry
Database: PDB / ID: 8pka
TitleStructure of the human mitochondrial iron-sulfur cluster biosynthesis complex during persulfide transfer (without frataxin)
Components
  • Acyl carrier protein
  • Cysteine desulfurase
  • Iron-sulfur cluster assembly enzyme ISCU
  • LYR motif-containing protein 4
KeywordsTRANSFERASE / cysteine desulfurase / FeS biosynthesis / FeS biogenesis / mitochondria / Friedreich's ataxia / persulfide / frataxin
Function / homology
Function and homology information


iron-sulfur cluster chaperone activity / negative regulation of iron ion import across plasma membrane / molybdopterin cofactor metabolic process / Molybdenum cofactor biosynthesis / L-cysteine desulfurase complex / [4Fe-4S] cluster assembly / Mitochondrial iron-sulfur cluster biogenesis / sulfur carrier activity / Complex III assembly / positive regulation of mitochondrial electron transport, NADH to ubiquinone ...iron-sulfur cluster chaperone activity / negative regulation of iron ion import across plasma membrane / molybdopterin cofactor metabolic process / Molybdenum cofactor biosynthesis / L-cysteine desulfurase complex / [4Fe-4S] cluster assembly / Mitochondrial iron-sulfur cluster biogenesis / sulfur carrier activity / Complex III assembly / positive regulation of mitochondrial electron transport, NADH to ubiquinone / Maturation of TCA enzymes and regulation of TCA cycle / cysteine desulfurase / cysteine desulfurase activity / Mo-molybdopterin cofactor biosynthetic process / iron-sulfur cluster assembly complex / mitochondrial [2Fe-2S] assembly complex / [2Fe-2S] cluster assembly / lipid A biosynthetic process / iron-sulfur cluster assembly / lipid biosynthetic process / acyl binding / acyl carrier activity / iron-sulfur cluster binding / phosphopantetheine binding / ferrous iron binding / 2 iron, 2 sulfur cluster binding / fatty acid biosynthetic process / pyridoxal phosphate binding / Maturation of replicase proteins / molecular adaptor activity / intracellular iron ion homeostasis / nuclear body / mitochondrial matrix / iron ion binding / response to xenobiotic stimulus / lipid binding / centrosome / structural molecule activity / protein homodimerization activity / mitochondrion / zinc ion binding / nucleoplasm / metal ion binding / nucleus / membrane / cytoplasm / cytosol
Similarity search - Function
LYRM4, LYR domain / : / ISC system FeS cluster assembly, IscU scaffold / Cysteine desulfurase IscS / NIF system FeS cluster assembly, NifU, N-terminal / NifU-like N terminal domain / Cysteine desulfurase / Aminotransferase class-V, pyridoxal-phosphate binding site / Aminotransferases class-V pyridoxal-phosphate attachment site. / Aminotransferase class V domain ...LYRM4, LYR domain / : / ISC system FeS cluster assembly, IscU scaffold / Cysteine desulfurase IscS / NIF system FeS cluster assembly, NifU, N-terminal / NifU-like N terminal domain / Cysteine desulfurase / Aminotransferase class-V, pyridoxal-phosphate binding site / Aminotransferases class-V pyridoxal-phosphate attachment site. / Aminotransferase class V domain / Aminotransferase class-V / Complex 1 LYR protein domain / Complex 1 protein (LYR family) / Acyl carrier protein (ACP) / Phosphopantetheine attachment site / Phosphopantetheine attachment site. / Phosphopantetheine attachment site / ACP-like superfamily / Pyridoxal phosphate-dependent transferase, small domain / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / Pyridoxal phosphate-dependent transferase, major domain / Pyridoxal phosphate-dependent transferase
Similarity search - Domain/homology
Chem-8Q1 / : / PYRIDOXAL-5'-PHOSPHATE / Acyl carrier protein / Iron-sulfur cluster assembly enzyme ISCU / LYR motif-containing protein 4 / Cysteine desulfurase
Similarity search - Component
Biological speciesHomo sapiens (human)
Escherichia coli BL21 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.75 Å
AuthorsSteinhilper, R. / Murphy, B.J.
Funding support Germany, 1items
OrganizationGrant numberCountry
Max Planck Society Germany
CitationJournal: Nat Commun / Year: 2024
Title: Mechanism and structural dynamics of sulfur transfer during de novo [2Fe-2S] cluster assembly on ISCU2.
Authors: Vinzent Schulz / Ralf Steinhilper / Jonathan Oltmanns / Sven-A Freibert / Nils Krapoth / Uwe Linne / Sonja Welsch / Maren H Hoock / Volker Schünemann / Bonnie J Murphy / Roland Lill /
Abstract: Maturation of iron-sulfur proteins in eukaryotes is initiated in mitochondria by the core iron-sulfur cluster assembly (ISC) complex, consisting of the cysteine desulfurase sub-complex NFS1-ISD11- ...Maturation of iron-sulfur proteins in eukaryotes is initiated in mitochondria by the core iron-sulfur cluster assembly (ISC) complex, consisting of the cysteine desulfurase sub-complex NFS1-ISD11-ACP1, the scaffold protein ISCU2, the electron donor ferredoxin FDX2, and frataxin, a protein dysfunctional in Friedreich's ataxia. The core ISC complex synthesizes [2Fe-2S] clusters de novo from Fe and a persulfide (SSH) bound at conserved cluster assembly site residues. Here, we elucidate the poorly understood Fe-dependent mechanism of persulfide transfer from cysteine desulfurase NFS1 to ISCU2. High-resolution cryo-EM structures obtained from anaerobically prepared samples provide snapshots that both visualize different stages of persulfide transfer from Cys381 to Cys138 and clarify the molecular role of frataxin in optimally positioning assembly site residues for fast sulfur transfer. Biochemical analyses assign ISCU2 residues essential for sulfur transfer, and reveal that Cys138 rapidly receives the persulfide without a detectable intermediate. Mössbauer spectroscopy assessing the Fe coordination of various sulfur transfer intermediates shows a dynamic equilibrium between pre- and post-sulfur-transfer states shifted by frataxin. Collectively, our study defines crucial mechanistic stages of physiological [2Fe-2S] cluster assembly and clarifies frataxin's molecular role in this fundamental process.
History
DepositionJun 26, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 1, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cysteine desulfurase
B: LYR motif-containing protein 4
C: Acyl carrier protein
D: Iron-sulfur cluster assembly enzyme ISCU
hetero molecules


Theoretical massNumber of molelcules
Total (without water)83,6137
Polymers82,7694
Non-polymers8443
Water1,11762
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 4 types, 4 molecules ABCD

#1: Protein Cysteine desulfurase


Mass: 44937.449 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: NFS1, NIFS, HUSSY-08 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9Y697, cysteine desulfurase
#2: Protein LYR motif-containing protein 4


Mass: 13502.373 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: LYRM4, C6orf149, ISD11, CGI-203 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9HD34
#3: Protein Acyl carrier protein / ACP / Cytosolic-activating factor / CAF / Fatty acid synthase acyl carrier protein


Mass: 8645.460 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A6A8
#4: Protein Iron-sulfur cluster assembly enzyme ISCU / NifU-like N-terminal domain-containing protein / NifU-like protein


Mass: 15684.119 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ISCU, NIFUN / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9H1K1

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Non-polymers , 4 types, 65 molecules

#5: Chemical ChemComp-PLP / PYRIDOXAL-5'-PHOSPHATE / VITAMIN B6 Phosphate


Mass: 247.142 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H10NO6P / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical ChemComp-8Q1 / S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate / S-dodecanoyl-4'-phosphopantetheine


Mass: 540.651 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C23H45N2O8PS / Feature type: SUBJECT OF INVESTIGATION
#7: Chemical ChemComp-FE2 / FE (II) ION


Mass: 55.845 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe / Feature type: SUBJECT OF INVESTIGATION
#8: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 62 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Iron-bound human NFS1-ISD11-ACP1-ISCU2-FXN (Fe-NIAUX) complex during persulfide transferCOMPLEX#1-#40RECOMBINANT
2Cysteine desulfurase, LYR motif-containing protein 4 and Iron-sulfur cluster assembly enzyme ISCUCOMPLEX#1-#2, #41RECOMBINANT
3Acyl carrier proteinCOMPLEX#31NATURAL
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
33Escherichia coli BL21(DE3) (bacteria)469008
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 62 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameVersionCategory
2EPUimage acquisition
7Coot0.9model fitting
12RELION3.1.33D reconstruction
13PHENIX1.20.1model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.75 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 269101 / Symmetry type: POINT
Atomic model buildingPDB-ID: 6NZU

6nzu


Accession code: 6NZU / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00311837
ELECTRON MICROSCOPYf_angle_d0.48315982
ELECTRON MICROSCOPYf_dihedral_angle_d3.9171676
ELECTRON MICROSCOPYf_chiral_restr0.0411807
ELECTRON MICROSCOPYf_plane_restr0.0042053

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