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Primary Active Transport01:47

Primary Active Transport

179.0K
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...
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Primary Active Transport01:29

Primary Active Transport

15.5K
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...
15.5K
ATP Driven Pumps I: An Overview01:27

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...
8.1K
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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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...
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ATP Synthase: Structure01:18

ATP Synthase: Structure

16.3K
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...
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Chemiosmosis and ATP Synthesis01:22

Chemiosmosis and ATP Synthesis

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The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
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Related Experiment Video

Updated: May 6, 2026

Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
10:39

Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography

Published on: September 14, 2014

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ATP synthase activity boosts membrane proton acceptance and lateral diffusion.

Hendrik Flegel1, Ambili Ramanthrikkovil Variyam2, Nadav Amdursky2,3

  • 1Faculty of Chemistry, Institute of Organic and Biomolecular Chemistry, University of Göttingen, Göttingen 37077, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|March 3, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals that cell membranes actively participate in proton transfer, directly supplying protons to ATP synthase. This localized proton coupling enhances ATP synthesis, even when bulk proton levels are low.

Keywords:
HPTSenergy conversionproton transfertime-correlated single photon countingunilamellar vesicles

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Area of Science:

  • Bioenergetics
  • Membrane Biophysics
  • Biochemistry

Background:

  • ATP synthesis relies on proton motive force (pmf) and ATP synthase.
  • Chemiosmotic theory suggests delocalized coupling, but localized proton transfer (PT) at membranes is increasingly evident.

Purpose of the Study:

  • To directly track ultrafast proton transfer at the membrane surface.
  • To investigate the role of the membrane in proton translocation during ATP synthesis.
  • To differentiate between delocalized and localized proton coupling models.

Main Methods:

  • Developed an in vitro system using unilamellar vesicles.
  • Tethered a photoacid to the membrane interface for localized PT tracking.
  • Co-reconstituted thermophilic ATP synthase.
  • Utilized steady-state and time-resolved fluorescence spectroscopy.

Main Results:

  • The membrane surface accepts protons, facilitating PT.
  • Proton transfer is significantly enhanced only when ATP synthase is actively producing ATP.
  • Protons consumed by ATP synthase do not equilibrate with the bulk aqueous phase, indicating direct interfacial transfer.

Conclusions:

  • The cell membrane actively participates in proton transfer, acting as a conduit for protons to ATP synthase.
  • Localized proton coupling, mediated by the membrane interface, strengthens ATP synthesis efficiency.
  • Findings refine understanding of proton translocation mechanisms in bioenergetics.