Related Experiment Video
Updated: Jul 21, 2026
19:56
Introduction to Solid Supported Membrane Based Electrophysiology
Published on: May 11, 2013
Computer simulation of the kinetics of the sodium pump
1School of Life Sciences, University of Hyderabad, India.
Indian Journal of Biochemistry & Biophysics
|June 1, 1990
Summary
A new kinetic model explains sodium (Na+) efflux and potassium (K+) influx for the Na+, K(+)-ATPase enzyme. This model accounts for ion binding and competition, validated against experimental data.
Area of Science:
- Biochemistry
- Enzymology
- Membrane Transport
Background:
- The Na+, K(+)-ATPase is a crucial membrane protein responsible for maintaining electrochemical gradients.
- Understanding its kinetic properties is essential for comprehending cellular ion homeostasis.
Purpose of the Study:
- To develop a simple kinetic model for the membrane-bound Na+, K(+)-ATPase.
- To derive an equation describing Na+ efflux and K+ influx.
- To explain cation binding and competition mechanisms.
Main Methods:
- Formulation of a kinetic model for Na+, K(+)-ATPase.
- Derivation of an equation for ion transport.
- Computational analysis using a BASIC program.
- Validation against experimental data.
Main Results:
- A derived equation effectively models Na+ efflux and K+ influx.
- The model explains multiple ligand binding of homospecies cations.
- It also accounts for competition between heterospecies cations.
- Computational results align with experimental observations.
Conclusions:
- The presented kinetic model offers a simplified yet comprehensive framework for Na+, K(+)-ATPase function.
- The derived equation provides insights into ion transport mechanisms and cation interactions.
- The model's validity is supported by experimental data, suggesting its utility in further research.
Related Concept Videos
01:47Primary 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...
01:29Primary 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...
01:27ATP 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...
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...
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:34ATP Driven Pumps II: P-type Pumps
The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
01:12Mechanically-gated Ion Channels
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...