cation:proton antiporter functions in maintaining cation homeostasis and the pH of actively metabolizing cells; it may also be involved in regulating cell volume; similar to K(+) efflux antiporters that are involved in K(+) homeostasis and osmotic adjustment
F-type ATP synthase, membrane subunit b; Membrane subunit b is a component of the Fo complex ...
133-213
4.83e-03
F-type ATP synthase, membrane subunit b; Membrane subunit b is a component of the Fo complex of FoF1-ATP synthase. The F-type ATP synthases (FoF1-ATPase) consist of two structural domains: the F1 (assembly factor one) complex containing the soluble catalytic core, and the Fo (oligomycin sensitive factor) complex containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. F1 is composed of alpha (or A), beta (B), gamma (C), delta (D) and epsilon (E) subunits with a stoichiometry of 3:3:1:1:1, while Fo consists of the three subunits a, b, and c (1:2:10-14). An oligomeric ring of 10-14 c subunits (c-ring) make up the Fo rotor. The flux of protons through the ATPase channel (Fo) drives the rotation of the c-ring, which in turn is coupled to the rotation of the F1 complex gamma subunit rotor due to the permanent binding between the gamma and epsilon subunits of F1 and the c-ring of Fo. The F-ATP synthases are primarily found in the inner membranes of eukaryotic mitochondria, in the thylakoid membranes of chloroplasts or in the plasma membranes of bacteria. The F-ATP synthases are the primary producers of ATP, using the proton gradient generated by oxidative phosphorylation (mitochondria) or photosynthesis (chloroplasts). Alternatively, under conditions of low driving force, ATP synthases function as ATPases, thus generating a transmembrane proton or Na(+) gradient at the expense of energy derived from ATP hydrolysis. This group also includes F-ATP synthase that has also been found in the archaea Candidatus Methanoperedens.
The actual alignment was detected with superfamily member cd06503:
Pssm-ID: 473877 [Multi-domain] Cd Length: 132 Bit Score: 37.42 E-value: 4.83e-03
Sodium/hydrogen exchanger family; Na/H antiporters are key transporters in maintaining the pH ...
210-496
3.58e-43
Sodium/hydrogen exchanger family; Na/H antiporters are key transporters in maintaining the pH of actively metabolising cells. The molecular mechanisms of antiport are unclear. These antiporters contain 10-12 transmembrane regions (M) at the amino-terminus and a large cytoplasmic region at the carboxyl terminus. The transmembrane regions M3-M12 share identity with other members of the family. The M6 and M7 regions are highly conserved. Thus, this is thought to be the region that is involved in the transport of sodium and hydrogen ions. The cytoplasmic region has little similarity throughout the family.
Pssm-ID: 425982 [Multi-domain] Cd Length: 377 Bit Score: 158.57 E-value: 3.58e-43
F-type ATP synthase, membrane subunit b; Membrane subunit b is a component of the Fo complex ...
133-213
4.83e-03
F-type ATP synthase, membrane subunit b; Membrane subunit b is a component of the Fo complex of FoF1-ATP synthase. The F-type ATP synthases (FoF1-ATPase) consist of two structural domains: the F1 (assembly factor one) complex containing the soluble catalytic core, and the Fo (oligomycin sensitive factor) complex containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. F1 is composed of alpha (or A), beta (B), gamma (C), delta (D) and epsilon (E) subunits with a stoichiometry of 3:3:1:1:1, while Fo consists of the three subunits a, b, and c (1:2:10-14). An oligomeric ring of 10-14 c subunits (c-ring) make up the Fo rotor. The flux of protons through the ATPase channel (Fo) drives the rotation of the c-ring, which in turn is coupled to the rotation of the F1 complex gamma subunit rotor due to the permanent binding between the gamma and epsilon subunits of F1 and the c-ring of Fo. The F-ATP synthases are primarily found in the inner membranes of eukaryotic mitochondria, in the thylakoid membranes of chloroplasts or in the plasma membranes of bacteria. The F-ATP synthases are the primary producers of ATP, using the proton gradient generated by oxidative phosphorylation (mitochondria) or photosynthesis (chloroplasts). Alternatively, under conditions of low driving force, ATP synthases function as ATPases, thus generating a transmembrane proton or Na(+) gradient at the expense of energy derived from ATP hydrolysis. This group also includes F-ATP synthase that has also been found in the archaea Candidatus Methanoperedens.
Pssm-ID: 349951 [Multi-domain] Cd Length: 132 Bit Score: 37.42 E-value: 4.83e-03
Sodium/hydrogen exchanger family; Na/H antiporters are key transporters in maintaining the pH ...
210-496
3.58e-43
Sodium/hydrogen exchanger family; Na/H antiporters are key transporters in maintaining the pH of actively metabolising cells. The molecular mechanisms of antiport are unclear. These antiporters contain 10-12 transmembrane regions (M) at the amino-terminus and a large cytoplasmic region at the carboxyl terminus. The transmembrane regions M3-M12 share identity with other members of the family. The M6 and M7 regions are highly conserved. Thus, this is thought to be the region that is involved in the transport of sodium and hydrogen ions. The cytoplasmic region has little similarity throughout the family.
Pssm-ID: 425982 [Multi-domain] Cd Length: 377 Bit Score: 158.57 E-value: 3.58e-43
F-type ATP synthase, membrane subunit b; Membrane subunit b is a component of the Fo complex ...
133-213
4.83e-03
F-type ATP synthase, membrane subunit b; Membrane subunit b is a component of the Fo complex of FoF1-ATP synthase. The F-type ATP synthases (FoF1-ATPase) consist of two structural domains: the F1 (assembly factor one) complex containing the soluble catalytic core, and the Fo (oligomycin sensitive factor) complex containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. F1 is composed of alpha (or A), beta (B), gamma (C), delta (D) and epsilon (E) subunits with a stoichiometry of 3:3:1:1:1, while Fo consists of the three subunits a, b, and c (1:2:10-14). An oligomeric ring of 10-14 c subunits (c-ring) make up the Fo rotor. The flux of protons through the ATPase channel (Fo) drives the rotation of the c-ring, which in turn is coupled to the rotation of the F1 complex gamma subunit rotor due to the permanent binding between the gamma and epsilon subunits of F1 and the c-ring of Fo. The F-ATP synthases are primarily found in the inner membranes of eukaryotic mitochondria, in the thylakoid membranes of chloroplasts or in the plasma membranes of bacteria. The F-ATP synthases are the primary producers of ATP, using the proton gradient generated by oxidative phosphorylation (mitochondria) or photosynthesis (chloroplasts). Alternatively, under conditions of low driving force, ATP synthases function as ATPases, thus generating a transmembrane proton or Na(+) gradient at the expense of energy derived from ATP hydrolysis. This group also includes F-ATP synthase that has also been found in the archaea Candidatus Methanoperedens.
Pssm-ID: 349951 [Multi-domain] Cd Length: 132 Bit Score: 37.42 E-value: 4.83e-03
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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