CATH Classification

Domain Context

CATH Clusters

Superfamily Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain
Functional Family Mitochondrial succinate dehydrogenase flavoprotein subunit

Enzyme Information
Succinate dehydrogenase (quinone).
based on mapping to UniProt P0AC41
Succinate + a quinone = fumarate + a quinol.
-!- The enzyme is found in the inner mitochondrial membrane in eukaryotes and the plasma membrane of many aerobic or facultative bacteria. -!- It catalyzes succinate oxidation in the citric acid cycle and transfers the electrons to quinones in the membrane, thus constituting a part of the aerobic respiratory chain (known as complex II). -!- In vivo the enzyme uses the quinone found in the organism - eukaryotic enzymes utilize ubiquinone, bacterial enzymes utilize ubiquinone or menaquinone, and archaebacterial enzymes from the Sulfolobus genus use caldariellaquinone. -!- Cf. EC

UniProtKB Entries (1)

Escherichia coli K-12
Succinate dehydrogenase flavoprotein subunit

PDB Structure

External Links
Primary Citation
Crystal Structure of the E. Coli Succinate:Quinone Oxidoreductase (Sqr) Sdhd His71met Mutant
Ruprecht, J., Yankovskaya, V., Maklashina, E., Iwata, S., Cecchini, G.
To be Published