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Related Concept Videos

ATP Synthase: Structure01:18

ATP Synthase: Structure

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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...
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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 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...
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ATP Driven Pumps II: P-type Pumps01:34

ATP Driven Pumps II: P-type Pumps

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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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ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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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...
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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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Isolation of F1-ATPase from the Parasitic Protist Trypanosoma brucei
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Optimal Control of the F1-ATPase Molecular Motor.

Deepak Gupta1,2, Steven J Large1, Shoichi Toyabe3

  • 1Department of Physics, Simon Fraser University, BurnabyV5A 1S6, British Columbia, Canada.

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Researchers designed a novel control protocol to minimize energy dissipation in the F1-ATPase molecular motor during ATP synthesis. This optimized method requires significantly less work compared to standard approaches, offering insights into efficient biomolecular machine operation.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Molecular Biology

Background:

  • F1-ATPase is a rotary molecular motor essential for ATP synthesis in vivo.
  • Understanding its high efficiency in free-energy transduction under nonequilibrium conditions is crucial.

Purpose of the Study:

  • To design a control protocol minimizing dissipation for efficient ATP synthesis by F1-ATPase.
  • To explore energy transduction mechanisms in biomolecular machines.

Main Methods:

  • Utilized a near-equilibrium framework.
  • Designed and analyzed a novel control protocol for rotating F1-ATPase.
  • Compared work requirements against a naive constant-velocity protocol.

Main Results:

  • The designed protocol significantly reduces the work required for ATP synthesis compared to a naive protocol.
  • This efficiency holds true across various protocol durations.

Conclusions:

  • The study proposes a mechanism for energetically efficient F1-ATPase operation in vivo.
  • Provides insights applicable to free-energy transduction in diverse biomolecular and synthetic machines.