Complex BCS1L:MT-CYB:heme b:UQCR10:UQCR11:UQCRB:UQCRC1:UQCRC2:UQCRFS1P1:UQCRH:UQCRQ:iron-sulfur subunit 
 
Complex composition:
- UQCRB 
  - UQCRC1 
  - BCS1L 
  - UQCRC2 
  - UQCRH 
  - UQCRFS1P1 
  - UQCR11 
  - UQCRQ 
  - UQCR10 
  - iron-sulfur subunit 
  - MT-CYB:heme b 
  
Modifications:
Participates in complexes:
In compartment: mitochondrial matrix
- BCS1L:MT-CYB:heme b:UQCR10:UQCR11:UQCRB:UQCRC1:UQCRC2:UQCRFS1P1:UQCRH:UQCRQ:iron-sulfur subunit@mitochondrial matrix 
 
 
Participates in reactions:
As Reactant or Product:- CI:CII:CIII:CIV:CV:Fe-S@mitochondrial matrix 
  → 
  BCS1L:MT-CYB:heme b:UQCR10:UQCR11:UQCRB:UQCRC1:UQCRC2:UQCRFS1P1:UQCRH:UQCRQ:iron-sulfur subunit@mitochondrial matrix 
 
 
As Catalyser:- O2@mitochondrial matrix 
  → 
  superoxide@mitochondrial matrix 
 
 - ubiquinol@mitochondrial matrix 
  + CYCS|oxidized@mitochondrial matrix 
  + H+@mitochondrial matrix 
  → 
  ubiquinone@mitochondrial matrix 
  + CYCS|reduced@mitochondrial matrix 
  + H+@mitochondrion