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Dictionary » A » ATPase

ATPase

Definition

noun, plural: ATPases

An enzyme that catalyzes the hydrolysis or decomposition of ATP into ADP and a free phosphate ion, thereby releasing energy for use in another biochemical reaction.


Supplement

Examples of ATPases are transmembrane ATPases that move solutes across the membrane, especially against their concentration gradient and V-ATPases that are primarily found in eukaryotic vacuoles, catalysing ATP hydrolysis to transport solutes and lower pH in organelles.


See also: ATP synthase


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Chemiosmosis

It serves pretty much the same aim, i.e. production of energy by ATPase. One can thing about it as being flipped (inside-out) in comparison to mitochondria or as analogy with cristae being stroma. One more thing that came to my mind. RuBISCO is activated ...

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by JackBean
Thu Nov 29, 2012 1:56 pm
 
Forum: Cell Biology
Topic: Chemiosmosis
Replies: 5
Views: 2145

Questions on the Sodium Potassium Pump and Enzymes

... fit is basically right. For example DNA Pol has two active sites, try to find out something about proof-reading mechanism. I don't know about the ATPase, but I don't remember any mention of kinase or phosphatase.

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by JackBean
Tue Nov 06, 2012 9:23 pm
 
Forum: Cell Biology
Topic: Questions on the Sodium Potassium Pump and Enzymes
Replies: 3
Views: 1527

Questions on the Sodium Potassium Pump and Enzymes

Although the Sodium Pump is an ATPase, during it's cycle there is a phosphate group being added and taken away from the protein so surely kinase and phosphotase are involved because an ATPase only hydrolyses ATP? Also, we are just going ...

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by JoWillyTso
Mon Nov 05, 2012 5:50 pm
 
Forum: Cell Biology
Topic: Questions on the Sodium Potassium Pump and Enzymes
Replies: 3
Views: 1527

I need some help understanding mitochondria

... RuBISCO in plant cells. Concentration gradient is gradient of concentration. If you do not understand to any of these words, look them up. The ATPase uses difference of hydrogen concentrations to synthesise ATP. C'mon, you really cannot find electron transport chain? :roll: Because the enzymes ...

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by JackBean
Sat Oct 06, 2012 9:53 pm
 
Forum: Cell Biology
Topic: I need some help understanding mitochondria
Replies: 1
Views: 1404

Hydrochloric acid (HCL) in the stomach..

... of 0.1M. The secreted -protons, which are derived from the intracellular hydration of CO2 by carbonic anhydrase, are pumped out by an (H+ k+) ATPase antiport transporter is also required to complete the overall transport system. a) Calculate the pH of the secreted HCL. How does this compare ...

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by TwinkleK
Fri Feb 10, 2012 12:58 pm
 
Forum: Molecular Biology
Topic: Hydrochloric acid (HCL) in the stomach..
Replies: 9
Views: 2583
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