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MolNFT v1 · #16275 · protein

Crystal structure of mitochondrial cytochrome BC1 complexed with 2- nonyl-4-hydroxyquinoline N-oxide (nqno)

1NU1 · Ubiquinol-cytochrome C reductase complex core protein I…: “Crystal structure of mitochondrial cytochrome BC1 complexed with 2- nonyl-4-hydroxyquinoline N-oxide (nqno)”. X-ray diffraction, 3 ligands (HEM, FES, QNO), 20 pockets (best…

PDB
1NU1
Type
protein
Length
2,105 residues
Chains
11
Method
x-ray diffraction
Collection
MolNFT v1 / PDB
Contract
0xDE3723766Bc32dcACD03C17BaA400A7B36837Eba
Owner
0x3396CDB397284571d12822B4ae1189a8E22AAAAA
Molecule
Ubiquinol-cytochrome C reductase complex core protein I, mitochondrial…
EC
1.10.2.2
UniProt
P31800, P23004, P00157, P00125, P13272, P00129, P13271, P00126, P00130, P07552
Ligands
HEM, FES, QNO
Pockets
20 · best druggability 0.84

Structure

x-ray diffraction · 11 distinct chains · 50% helix, 12% strand (DSSP).

ChainMoleculeTypeResiduesSecondary structureUniProt
AUbiquinol-cytochrome C reductase complex core protein I, mitochondrial (EC 1.10.2.2)protein44647% helix, 18% strandP31800
BUbiquinol-cytochrome C reductase complex core protein 2, mitochondrial (EC 1.10.2.2)protein42343% helix, 20% strandP23004
CCytochrome Bprotein37868% helix, 2% strandP00157
DCytochrome C1protein24142% helix, 5% strandP00125
EUbiquinol-cytochrome C reductase iron-sulfur subunit, mitochondrial (EC 1.10.2.2)protein19628% helix, 20% strandP13272
FUbiquinol-cytochrome C reductase complex 14 kda protein (EC 1.10.2.2)protein10568% helix, 1% strandP00129
GUbiquinol-cytochrome C reductase complex ubiquinone-binding protein qp-C (EC 1.10.2.2)protein7551% helix, 12% strandP13271
HUbiquinol-cytochrome C reductase complex 11 kda protein (EC 1.10.2.2)protein7067% helix, 0% strandP00126
IUbiquinol-cytochrome C reductase 8 kda protein (EC 1.10.2.2)protein575% helix, 7% strandP13272
JUbiquinol-cytochrome C reductase complex 7.2 kda protein (EC 1.10.2.2)protein6172% helix, 0% strandP00130
KUbiquinol-cytochrome C reductase complex 6.4 kda protein (EC 1.10.2.2)protein5366% helix, 0% strandP07552

Ligands and binding sites

  • HEM · Protoporphyrin IX containing Fe · ligand · 3 copies · chains C, D
  • FES · Fe2/s2 (inorganic) cluster · ligand · chains E
  • QNO · 2-nonyl-4-hydroxyquinoline N-oxide · ligand · chains C

Binding sites are the residues within 4.5 Å of a ligand's heavy atoms.

Pockets

20 pockets found on a 1 Å grid, 17 with a druggability of 0.5 or more.

PocketVolume (ų)DruggabilityBuriednessLining residuesInside
18790.840.8682HEM
28720.820.8497empty
37010.800.8470empty
46710.800.8456empty
54830.790.8649HEM, QNO

Interfaces

24 interfaces between chains.

  • A–B · 2236 Ų buried · 35 hydrogen bonds · protein-protein
  • B–I · 2010 Ų buried · 23 hydrogen bonds · protein-protein
  • C–D · 1672 Ų buried · 17 hydrogen bonds · protein-protein
  • A–I · 1471 Ų buried · 25 hydrogen bonds · protein-protein
  • C–F · 1252 Ų buried · 9 hydrogen bonds · protein-protein

Modifications

Observed in the structure: 2 disulfide (disulfide).

Compared structures

  • 1NU1 · Crystal Structure of Mitochondrial Cytochrome bc1 Complexed with… · the same entry in another collection · chain K against K, TM-score 1.00
  • P00157 · AlphaFold monomer V2.0 prediction for cytochrome B (P00157) · a predicted model of the same protein · chain C against A, TM-score 0.99

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