Activating Compound | Comment | Organism | Structure |
---|---|---|---|
ATP | ATPase activity increases as ATP increased and the activity is saturated at about 6 mM ATP | Aphanothece halophytica | |
carbonyl cyanide m-chlorophenyl hydrazine | - |
Aphanothece halophytica | |
nitrate | - |
Aphanothece halophytica |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
additional information | not inhibited by 0.2 mM amiloride, 0.01 mM orthovanadate, 0.5 mM NEM, 50 mM KNO3, 20 mM KSCN, 1 mM CCP, and 1 mM ouabain | Aphanothece halophytica | |
N,N-dicyclohexylcarbodiimide | 78% residual activity at 1 mM in the presence of 10 mM NaCl. Inhibition in the absence of NaCl occurs after 20 min yielding 80 and 70% inhibition at pH 7.6 and pH 9.0, respectively | Aphanothece halophytica | |
Sodium azide | 64% residual activity at 5 mM | Aphanothece halophytica |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
1.2 | - |
ATP | apparent value, at pH 7.6, temperature not specified in the publication | Aphanothece halophytica | |
2 | - |
Na+/in | apparent value, at pH 7.6, temperature not specified in the publication | Aphanothece halophytica |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
membrane | proteoliposome | Aphanothece halophytica | 16020 | - |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | maximal ATPase activity is observed at 5 mM Mg2+ | Aphanothece halophytica | |
additional information | K+, Li+, and Ca2+ have no stimulatory effect on enzyme activity | Aphanothece halophytica | |
Na+ | the enzyme is stimulated about 9fold at pH 7.6 and about 11fold at both pH 9.0 and 11.0 with 10 mM NaCl | Aphanothece halophytica |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
6500 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
16500 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
22000 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
25000 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
35000 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
52000 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
56000 | - |
x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Aphanothece halophytica | - |
- |
- |
Purification (Comment) | Organism |
---|---|
PEG 6000 precipitation and Superose 6 gel filtration | Aphanothece halophytica |
Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
---|---|---|---|
0.0266 | - |
crude enzyme from membrane vesicles, at pH 7.6, temperature not specified in the publication | Aphanothece halophytica |
0.4667 | - |
after 17.5fold purification, at pH 7.6, temperature not specified in the publication | Aphanothece halophytica |
Storage Stability | Organism |
---|---|
-20°C, purified enzyme, 1 month, the enzyme remains stable | Aphanothece halophytica |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
ATP + H2O + Na+/in | the purified enzyme catalyzes the hydrolysis of ATP in the presence of Na+ but not K+, Li+ and Ca2+ | Aphanothece halophytica | ADP + phosphate + Na+/out | - |
? |
Subunits | Comment | Organism |
---|---|---|
? | x * 56000 + x * 52000 + x * 35000 + x * 25000 + x * 22000 + x * 16500 + x * 6500, SDS-PAGE | Aphanothece halophytica |
Synonyms | Comment | Organism |
---|---|---|
Na+-stimulated ATPase | - |
Aphanothece halophytica |
pH Stability | pH Stability Maximum | Comment | Organism |
---|---|---|---|
6 | 11 | when the pH is increased from pH 6.0 to pH 9.0, the enzyme activity is increased progressively. Increasing the pH further to pH 11.0 results in a slightly declined enzyme activity | Aphanothece halophytica |
Organism | Comment | Expression |
---|---|---|
Aphanothece halophytica | cells grown at 2 M NaCl show higher enzyme activity than those grown at 0.5 M NaCl. ATPase activity in is slightly increased upon increasing the pH from 5.0 to 7.6 | up |
General Information | Comment | Organism |
---|---|---|
physiological function | the enzyme functions as an electrogenic Na+ pump which transports only Na+ upon hydrolysis of ATP. Na+- and ATP-dependent H+ efflux from proteoliposomes, is driven by the electric potential generated by Na+-stimulated ATPase | Aphanothece halophytica |