![](files/infoQ.gif)
succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial [Microcaecilia unicolor]
SQR_TypeC_CybS domain-containing protein( domain architecture ID 10131270)
SQR_TypeC_CybS domain-containing protein
List of domain hits
![](files/help.png)
Name | Accession | Description | Interval | E-value | |||
SQR_TypeC_CybS | cd03496 | SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to ... |
58-156 | 2.55e-33 | |||
SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to quinol. Eukaryotic SQRs reduce high potential quinones such as ubiquinone. SQR is also called succinate dehydrogenase or Complex II, and is part of the citric acid cycle and the aerobic respiratory chain. SQR is composed of a flavoprotein catalytic subunit, an iron-sulfur protein and one or two hydrophobic transmembrane subunits. Members of this subfamily are classified as Type C SQRs because they contain two transmembrane subunits and one heme group. CybS and CybL are the two transmembrane proteins of eukaryotic SQRs. They contain heme and quinone binding sites. CybS is the eukaryotic homolog of the bacterial SdhD subunit. The two-electron oxidation of succinate in the flavoprotein active site is coupled to the two-electron reduction of quinone in the transmembrane subunits via electron transport through FAD and three iron-sulfur centers. The reversible reduction of quinone is an essential feature of respiration, allowing transfer of electrons between respiratory complexes. Mutations in human Complex II result in various physiological disorders including hereditary paraganglioma and pheochromocytoma tumors. The gene encoding for the SdhD subunit is classified as a tumor suppressor gene. : Pssm-ID: 239576 Cd Length: 104 Bit Score: 113.49 E-value: 2.55e-33
|
|||||||
Name | Accession | Description | Interval | E-value | |||
SQR_TypeC_CybS | cd03496 | SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to ... |
58-156 | 2.55e-33 | |||
SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to quinol. Eukaryotic SQRs reduce high potential quinones such as ubiquinone. SQR is also called succinate dehydrogenase or Complex II, and is part of the citric acid cycle and the aerobic respiratory chain. SQR is composed of a flavoprotein catalytic subunit, an iron-sulfur protein and one or two hydrophobic transmembrane subunits. Members of this subfamily are classified as Type C SQRs because they contain two transmembrane subunits and one heme group. CybS and CybL are the two transmembrane proteins of eukaryotic SQRs. They contain heme and quinone binding sites. CybS is the eukaryotic homolog of the bacterial SdhD subunit. The two-electron oxidation of succinate in the flavoprotein active site is coupled to the two-electron reduction of quinone in the transmembrane subunits via electron transport through FAD and three iron-sulfur centers. The reversible reduction of quinone is an essential feature of respiration, allowing transfer of electrons between respiratory complexes. Mutations in human Complex II result in various physiological disorders including hereditary paraganglioma and pheochromocytoma tumors. The gene encoding for the SdhD subunit is classified as a tumor suppressor gene. Pssm-ID: 239576 Cd Length: 104 Bit Score: 113.49 E-value: 2.55e-33
|
|||||||
CybS | pfam05328 | CybS, succinate dehydrogenase cytochrome B small subunit; This family consists of several ... |
61-156 | 1.62e-15 | |||
CybS, succinate dehydrogenase cytochrome B small subunit; This family consists of several eukaryotic succinate dehydrogenase [ubiquinone] cytochrome B small subunit, mitochondrial precursor (CybS) proteins. SDHD encodes the small subunit (cybS) of cytochrome b in succinate-ubiquinone oxidoreductase (mitochondrial complex II). Mitochondrial complex II is involved in the Krebs cycle and in the aerobic electron transport chain. It contains four proteins. The catalytic core consists of a flavoprotein and an iron-sulfur protein; these proteins are anchored to the mitochondrial inner membrane by the large subunit of cytochrome b (cybL) and cybS, which together comprise the heme-protein cytochrome b. Mutations in the SDHD gene can lead to hereditary paraganglioma, characterized by the development of benign, vascularised tumours in the head and neck. Pssm-ID: 461624 Cd Length: 131 Bit Score: 68.41 E-value: 1.62e-15
|
|||||||
Name | Accession | Description | Interval | E-value | |||
SQR_TypeC_CybS | cd03496 | SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to ... |
58-156 | 2.55e-33 | |||
SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to quinol. Eukaryotic SQRs reduce high potential quinones such as ubiquinone. SQR is also called succinate dehydrogenase or Complex II, and is part of the citric acid cycle and the aerobic respiratory chain. SQR is composed of a flavoprotein catalytic subunit, an iron-sulfur protein and one or two hydrophobic transmembrane subunits. Members of this subfamily are classified as Type C SQRs because they contain two transmembrane subunits and one heme group. CybS and CybL are the two transmembrane proteins of eukaryotic SQRs. They contain heme and quinone binding sites. CybS is the eukaryotic homolog of the bacterial SdhD subunit. The two-electron oxidation of succinate in the flavoprotein active site is coupled to the two-electron reduction of quinone in the transmembrane subunits via electron transport through FAD and three iron-sulfur centers. The reversible reduction of quinone is an essential feature of respiration, allowing transfer of electrons between respiratory complexes. Mutations in human Complex II result in various physiological disorders including hereditary paraganglioma and pheochromocytoma tumors. The gene encoding for the SdhD subunit is classified as a tumor suppressor gene. Pssm-ID: 239576 Cd Length: 104 Bit Score: 113.49 E-value: 2.55e-33
|
|||||||
CybS | pfam05328 | CybS, succinate dehydrogenase cytochrome B small subunit; This family consists of several ... |
61-156 | 1.62e-15 | |||
CybS, succinate dehydrogenase cytochrome B small subunit; This family consists of several eukaryotic succinate dehydrogenase [ubiquinone] cytochrome B small subunit, mitochondrial precursor (CybS) proteins. SDHD encodes the small subunit (cybS) of cytochrome b in succinate-ubiquinone oxidoreductase (mitochondrial complex II). Mitochondrial complex II is involved in the Krebs cycle and in the aerobic electron transport chain. It contains four proteins. The catalytic core consists of a flavoprotein and an iron-sulfur protein; these proteins are anchored to the mitochondrial inner membrane by the large subunit of cytochrome b (cybL) and cybS, which together comprise the heme-protein cytochrome b. Mutations in the SDHD gene can lead to hereditary paraganglioma, characterized by the development of benign, vascularised tumours in the head and neck. Pssm-ID: 461624 Cd Length: 131 Bit Score: 68.41 E-value: 1.62e-15
|
|||||||
Blast search parameters | ||||
|