• Succinate Dehydrogenase

    Current traces of Succinate Dehydrogenase (Respiratory Chain Complex II), measured on the SURFE²R N1.

Succinate Dehydrogenase - Succinate-Coenzyme Q Reductase

Gene family: Mitochondrial complex II 

The protein complex consists of four protein subunits: succinate dehydrogenase, (SDHA); succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial, (SDHB); succinate dehydrogenase complex subunit C, (SDHC) and succinate dehydrogenase complex, subunit D, (SDHD)

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). Complex 2 is a parallel electron transport pathway to complex 1, but unlike complex 1, no protons are transported to the intermembrane space in this pathway. Therefore, the pathway through complex 2 contributes less energy to the overall electron transport chain process.

Succinate Dehydrogenase: Background Information

CaV2.1, also known as brain calcium channel I, gives rise to P and/or Q-type calcium currents and is predominantly expressed in neuronal tissue. Localized to the presynaptic membrane of many types of neurons, CaV2.1 ion channels are involved in triggering neurotransmitter release via both, vesicle release and postsynaptic calcium entry.


Human Protein:
UniProt O00555


Function/ Application:
Pre-synaptic Ca2+ influx and neurotransmitter release in neurons, fast synaptic transmission

Migraine (FHM-1), ataxia (EA-2, SCA6), Benign paroxysmal torticollis of infancy, hemiplegia

β4 subunit CACNB4, α2δ subunits, calmodulin, CaBP1, VILIP, mint, CASK, Syntaxin, SNAP25

Kuratoxin, ω-agatoxin IIIA, ω-conotoxin MVIIC, ω-agatoxin-IVA, roscovitine

Patch Clamp: whole cell, room temperature

CaV channels often show a rundown phenomenon. Adequate intra- and extrcellular solutions are essential for a good data quality.

Recommended Reviews:
Catterall WA, Perez-Reyes E, Snutch TP, Striessnig J (2005). "International Union of Pharmacology. XLVIII. Nomenclature and structure-function relationships of voltage-gated calcium channels". Pharmacol Rev. 57 (4): 411–25.

Data and Applications

Respiratory Chain Complex II and III - Current Traces

Surfer RC II IIIIcon N1   SURFE2R N1 data and applications:

Respiratory Chain Complex II is a succinate dehydrogenase. In this complex, succinate is oxidated to fumarate. The electrons are transfered to the quinone pool, the Complex III (cytochrome bc1 complex) and cytochrome c, while four protons are transported to the intermembrane space.

a.      P-bond hydrolysis driven transporters

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