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ATP Driven Pumps I: An Overview

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...

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Toward an adequate scheme for the ATP synthase catalysis.

¹Molecular Biology Institute, Boyer Hall, University of California, Los Angeles, CA 90095-1570, USA. pdboyer@ucla.edu

Biochemistry. Biokhimiia

|December 12, 2001

Summary

Evidence strongly favors bi-site activation for ATP synthase catalysis, suggesting nucleotide binding at a second site. Three catalytic site types are proposed, with conformational changes driving ATP synthesis and hydrolysis.

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Area of Science:

Biochemistry
Enzyme kinetics
Molecular biology

Background:

ATP synthase is a crucial enzyme for cellular energy production.
Understanding its catalytic mechanism is key to comprehending energy transduction.
Previous models proposed different nucleotide binding mechanisms.

Purpose of the Study:

To review and revise the proposed reaction sequence for ATP synthase catalysis.
To evaluate evidence for bi-site versus tri-site activation during ATP hydrolysis.
To correlate conformational changes in ATP synthase with general enzyme catalysis.

Main Methods:

Review of existing experimental data and literature.
Analysis of X-ray crystallographic structures of ATP synthase.
Comparison of proposed mechanisms with general enzyme catalysis principles.

Main Results:

Evidence strongly supports bi-site activation over tri-site activation for rapid ATP hydrolysis.
A revised reaction sequence is proposed, involving three types of catalytic sites.
Conformational changes, including site interconversions during a 120-degree rotation, are central to the mechanism.

Conclusions:

The revised model accounts for nucleotide binding and release during ATP synthesis and hydrolysis.
The enzyme's catalytic cycle involves distinct site conformations and interconversions.
Proposed mechanisms align with broader principles of enzyme catalysis.