SSF81342

Transmembrane di-heme cytochromes

SUPERFAMILY entry
Member databaseSUPERFAMILY
SUPERFAMILY typehomologous superfamily

Description
Imported from IPR016174

This entry represents a haem-binding domain with a 4-helical bundle structure that is found in transmembrane di-haem cytochromes. The domain contains four transmembrane helices in an up-and-down bundle, and binds two haem groups in between the helices; three of the four haem-binding residues is conserved between family members. Proteins containing this domain include:


 * N-terminal domain of mitochondrial cytochrome b subunit, in which the domain contains an extra transmembrane linker helix that is absent in plant and cyanobacteria subunits
[1]
.
 * Cytochrome b6 subunit of the cytochrome b6f complex, which provides the electronic connection between the photosystems I and II reaction centres of oxygenic photosynthesis, and generates a transmembrane electrochemical proton gradient for adenosine triphosphate synthesis
[2]
.
 * Cytochrome gamma subunit of formate dehydrogenase-N (Fdn-N), which acts as a major component of Escherichia coli nitrate respiration
[3]
.


Please note, this entry also identifies a number of proteins that are cleaved into two chains - a truncated non-functional cytochrome oxidase 1 and an intron-encoded endonuclease.

References
Imported from IPR016174

1.Binding of the respiratory chain inhibitor antimycin to the mitochondrial bc1 complex: a new crystal structure reveals an altered intramolecular hydrogen-bonding pattern. Huang LS, Cobessi D, Tung EY, Berry EA. J. Mol. Biol. 351, 573-97, (2005). View articlePMID: 16024040

2.Structure of the cytochrome b6f complex of oxygenic photosynthesis: tuning the cavity. Kurisu G, Zhang H, Smith JL, Cramer WA. Science 302, 1009-14, (2003). View articlePMID: 14526088

3.Molecular basis of proton motive force generation: structure of formate dehydrogenase-N. Jormakka M, Tornroth S, Byrne B, Iwata S. Science 295, 1863-8, (2002). View articlePMID: 11884747

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