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Related Concept Videos

ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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...
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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...
ATP Driven Pumps I: An Overview01:27

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...
ATP Synthase: Structure01:18

ATP Synthase: Structure

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...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
ATP Driven Pumps II: P-type Pumps01:34

ATP 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...

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Modeling K(ATP) channel gating and its regulation.

Peter Proks1, Frances M Ashcroft

  • 1Henry Wellcome Centre for Gene Function, Department of Physiology, Anatomy and Genetics, University of Oxford, Parks Road, Oxford OX1 3PT, UK.

Progress in Biophysics and Molecular Biology
|November 6, 2008
PubMed
Summary

ATP-sensitive potassium (KATP) channels link cell metabolism to electrical activity. Understanding KATP channel gating mechanisms is crucial for modeling pancreatic beta-cell function and related diseases like diabetes.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cell Physiology

Background:

  • ATP-sensitive potassium (KATP) channels are vital regulators of cellular function, linking metabolic state to membrane potential.
  • Their activity is modulated by intracellular adenosine nucleotides, impacting diverse cell types, notably pancreatic beta-cells.

Purpose of the Study:

  • To review recent advancements in understanding KATP channel structure and function.
  • To elucidate the molecular mechanisms governing KATP channel gating by key modulators.
  • To evaluate mathematical models of KATP channel currents for physiological relevance.

Main Methods:

  • Literature review of KATP channel research.
  • Analysis of molecular mechanisms of channel gating.
  • Comparative assessment of macroscopic and single-channel current models.

Main Results:

  • KATP channel activity is finely tuned by adenosine nucleotides, phospholipids, and drugs like sulfonylureas.
  • Mutations in KATP channel subunits (Kir6.2, SUR1) are linked to neonatal diabetes and congenital hyperinsulinism.
  • Existing mathematical models offer insights but have limitations in fully capturing channel behavior.

Conclusions:

  • A comprehensive understanding of KATP channel gating is essential for accurate modeling of pancreatic beta-cell function in health and disease.
  • Further development of sophisticated models is needed to better represent KATP channel dynamics.
  • This review highlights key areas for future research in KATP channel biophysics and pathophysiology.