Protein Family Models

This family consists of several Cbb3-type cytochrome oxidase components (FixQ/CcoQ). FixQ is found in nitrogen fixing bacteria. Since nitrogen fixation is an energy-consuming process, effective symbioses depend on operation of a respiratory chain with a high affinity for O2, closely coupled to ATP production. This requirement is fulfilled by a special three-subunit terminal oxidase (cytochrome terminal oxidase cbb3), which was first identified in Bradyrhizobium japonicum as the product of the fixNOQP operon [1]. [1]. 11717256. Regulation of gene expression in response to oxygen in Rhizobium etli: role of FnrN in fixNOQP expression and in symbiotic nitrogen fixation. Lopez O, Morera C, Miranda-Rios J, Girard L, Romero D, Soberon M;. J Bacteriol 2001;183:6999-7006. (from Pfam)

Date:

2024-10-16

cbb3-type cytochrome c oxidase subunit 3 (CcoQ or FixQ) is a non-cofactor-containing single-spanning membrane protein that interacts with c-type cytochrome CcoP and is required for cbb3-type oxidase activity

Date:

2021-02-02