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ATP Driven Pumps I: An Overview

ATP Driven Pumps I: An Overview

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...

Primary Active Transport

Primary Active Transport

In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would not...

Primary Active Transport

Primary Active Transport

In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they...

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Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...

ATP Driven Pumps III: V-type Pumps

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The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...

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Related Experiment Video

Updated: May 28, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Published on: February 19, 2013

Electrostatic Interaction as a Key Modulator of Na⁺,K⁺-ATPase Function.

Shadreen Fairuz¹, Zhitong Li¹, Amy Gorman¹

¹School of Chemistry, University of Sydney, Sydney, NSW, 2006, Australia.

The Journal of Membrane Biology

|May 26, 2026

Summary

The sodium-potassium pump (Na+,K+-ATPase) rate is regulated by an electrostatic interaction. Divalent metal ions like Mg2+ can break this interaction, potentially controlling Na+,K+-ATPase activity in cells.

Keywords:

Calcium Electrophysiology Ionic strength Magnesium P-type ATPase Solid-supported-membrane

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Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET

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Published on: October 9, 2021

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Last Updated: May 28, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

Published on: February 19, 2013

Examining the Conformational Dynamics of Membrane Proteins in situ with Site-directed Fluorescence Labeling

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Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET

Chemical Modification of the Tryptophan Residue in a Recombinant Ca²⁺-ATPase N-domain for Studying Tryptophan-ANS FRET

Published on: October 9, 2021

Area of Science:

Biochemistry
Cell Biology
Membrane Transport

Background:

The Na+,K+-ATPase is a crucial integral membrane protein in all animal cells.
It actively transports sodium (Na+) and potassium (K+) ions across the plasma membrane, utilizing ATP hydrolysis.
The resulting Na+ electrochemical gradient powers secondary active transport systems, vital for cellular functions like nutrient reabsorption.

Purpose of the Study:

To investigate the factors influencing the rate-determining E2 → E1 conformational change of the mammalian Na+,K+-ATPase.
To elucidate the role of electrostatic interactions and divalent metal ions in regulating enzyme activity.

Main Methods:

Synthesis of new and previously published experimental results.
Analysis of kinetic data concerning the Na+,K+-ATPase conformational changes.
Comparison of dissociation constants for Ca2+ and Mg2+.

Main Results:

The rate of the E2 → E1 conformational change is significantly influenced by an electrostatic interaction in the E2 state.
This interaction's strength is dependent on ionic strength and, more critically, on divalent metal ion concentration (Ca2+, Mg2+).
Mg2+ at physiological concentrations appears capable of breaking this interaction, facilitating the conformational change.

Conclusions:

An electrostatic interaction, likely between the N-terminus and the membrane surface, regulates the Na+,K+-ATPase.
Divalent cations, particularly Mg2+, can modulate this interaction, suggesting a regulatory role in enzyme function.
Mg2+ may play a physiological role in controlling Na+,K+-ATPase activity, unlike Ca2+.