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Cryo-EM structure of cytochrome bc1 complex (complex-III) from respiratory supercomplex of Tetrahymena thermophila

Electron Microscopy
2.8Å resolution
PDB entry 8b6j coloured by chain, front view.
PDB entry 8b6j coloured by chain, side view.
PDB entry 8b6j coloured by chain, top view.
Source organism: Tetrahymena thermophila SB210
Assembly composition:
hetero 24-mer (preferred)
Entry contents: 12 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Multimeric state: hetero 24-mer
PDBe Complex ID: PDB-CPX-271322

Macromolecules

Peptidase M16 inactive domain protein
Chains: A, a
Length: 513 amino acids
Theoretical weight: 58.02 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: I7MGU2 (Residues: 1-513; Coverage: 100%)
Gene name: TTHERM_00502380
Pfam:
InterPro:
Peptidase M16 inactive domain protein in PDB entry 8b6j, assembly 1, front view.
Peptidase M16 inactive domain protein in PDB entry 8b6j, assembly 1, side view.
Peptidase M16 inactive domain protein in PDB entry 8b6j, assembly 1, top view.
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Peptidase M16 C-terminal domain-containing protein
Chains: B, b
Length: 482 amino acids
Theoretical weight: 53.03 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: I7MJ25 (Residues: 1-482; Coverage: 100%)
Gene name: TTHERM_00836690
Pfam: Peptidase M16 inactive domain
InterPro:
Peptidase M16 C-terminal domain-containing protein in PDB entry 8b6j, assembly 1, front view.
Peptidase M16 C-terminal domain-containing protein in PDB entry 8b6j, assembly 1, side view.
Peptidase M16 C-terminal domain-containing protein in PDB entry 8b6j, assembly 1, top view.
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Cytochrome b/b6 N-terminal region profile domain-containing protein
Chains: C, c
Length: 426 amino acids
Theoretical weight: 50.64 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: Q950Z1 (Residues: 1-426; Coverage: 100%)
Gene name: cob
Pfam: Cytochrome b/b6/petB
InterPro:
Cytochrome b/b6 N-terminal region profile domain-containing protein in PDB entry 8b6j, assembly 1, front view.
Cytochrome b/b6 N-terminal region profile domain-containing protein in PDB entry 8b6j, assembly 1, side view.
Cytochrome b/b6 N-terminal region profile domain-containing protein in PDB entry 8b6j, assembly 1, top view.
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Cytochrome protein c1
Chains: D, d
Length: 319 amino acids
Theoretical weight: 37.62 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: Q24IM5 (Residues: 1-319; Coverage: 100%)
Gene name: TTHERM_00918500
Pfam: Cytochrome C1 family
InterPro:
Cytochrome protein c1 in PDB entry 8b6j, assembly 1, front view.
Cytochrome protein c1 in PDB entry 8b6j, assembly 1, side view.
Cytochrome protein c1 in PDB entry 8b6j, assembly 1, top view.
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Rieske domain-containing protein
Chains: E, e
Length: 269 amino acids
Theoretical weight: 30.7 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: I7MIC7 (Residues: 1-269; Coverage: 100%)
Gene name: TTHERM_00295080
Pfam: Rieske [2Fe-2S] domain
InterPro:
Rieske domain-containing protein in PDB entry 8b6j, assembly 1, front view.
Rieske domain-containing protein in PDB entry 8b6j, assembly 1, side view.
Rieske domain-containing protein in PDB entry 8b6j, assembly 1, top view.
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Ubiquinol-cytochrome C reductase hinge domain-containing protein
Chains: F, f
Length: 86 amino acids
Theoretical weight: 9.89 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: Q23K66 (Residues: 1-86; Coverage: 100%)
Gene name: TTHERM_00194690
Pfam: Ubiquinol-cytochrome C reductase hinge protein
InterPro:
Ubiquinol-cytochrome C reductase hinge domain-containing protein in PDB entry 8b6j, assembly 1, front view.
Ubiquinol-cytochrome C reductase hinge domain-containing protein in PDB entry 8b6j, assembly 1, side view.
Ubiquinol-cytochrome C reductase hinge domain-containing protein in PDB entry 8b6j, assembly 1, top view.
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UQCRTT1
Chains: G, g
Length: 328 amino acids
Theoretical weight: 39.19 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: Q23F81 (Residues: 1-328; Coverage: 100%)
Gene name: TTHERM_00382330
UQCRTT1 in PDB entry 8b6j, assembly 1, front view.
UQCRTT1 in PDB entry 8b6j, assembly 1, side view.
UQCRTT1 in PDB entry 8b6j, assembly 1, top view.
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Transmembrane protein, putative
Chains: H, h
Length: 130 amino acids
Theoretical weight: 15.68 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: I7M484 (Residues: 1-130; Coverage: 100%)
Gene name: TTHERM_00765330
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, front view.
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, side view.
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, top view.
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Transmembrane protein, putative
Chains: I, i
Length: 119 amino acids
Theoretical weight: 14.26 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: I7MM45 (Residues: 1-119; Coverage: 100%)
Gene name: TTHERM_00456790
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, front view.
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, side view.
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, top view.
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UQCRTT3/UP1
Chains: J, j
Length: 66 amino acids
Theoretical weight: 5.63 KDa
Source organism: Tetrahymena thermophila SB210
UQCRTT3/UP1 in PDB entry 8b6j, assembly 1, front view.
UQCRTT3/UP1 in PDB entry 8b6j, assembly 1, side view.
UQCRTT3/UP1 in PDB entry 8b6j, assembly 1, top view.
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Transmembrane protein, putative
Chains: K, k
Length: 62 amino acids
Theoretical weight: 7.46 KDa
Source organism: Tetrahymena thermophila SB210
UniProt:
  • Canonical: I7MFL6 (Residues: 1-62; Coverage: 100%)
Gene name: TTHERM_00218930
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, front view.
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, side view.
Transmembrane protein, putative in PDB entry 8b6j, assembly 1, top view.
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UQCRTT2
Chains: L, l
Length: 41 amino acids
Theoretical weight: 4.85 KDa
Source organism: Tetrahymena thermophila SB210
UQCRTT2 in PDB entry 8b6j, assembly 1, front view.
UQCRTT2 in PDB entry 8b6j, assembly 1, side view.
UQCRTT2 in PDB entry 8b6j, assembly 1, top view.
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