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ATP Synthase: Mechanism

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...

The Electron Transport Chain

The Electron Transport Chain

The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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ATP Synthase: Structure

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...

Electron Transport Chain Components

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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...

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...

Amino Acid Catabolism

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...

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Related Experiment Video

Updated: Jul 12, 2026

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

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

Published on: September 14, 2014

ATP synthase is necessary for microcin H47 antibiotic action.

M Trujillo¹, E Rodríguez, M Laviña

¹Sección de Fisiología y Genética Bacterianas, Facultad de Ciencias, Iguá 4225, Montevideo 11.400, Uruguay.

Antimicrobial Agents and Chemotherapy

|October 16, 2001

Summary

Researchers identified key cellular components essential for the antibiotic microcin H47's action in Escherichia coli. The TonB pathway and ATP synthase complex are crucial for microcin H47 uptake and function.

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Published on: August 17, 2019

Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

Microcin H47 is a peptide antibiotic produced by Escherichia coli.
Understanding the mechanism of action of microcin H47 is crucial for developing new antimicrobial strategies.

Purpose of the Study:

To identify cellular components essential for microcin H47 antibiotic activity.
To elucidate the uptake and action pathways of microcin H47 in Escherichia coli.

Main Methods:

Isolation and analysis of microcin H47-resistant mutants.
Characterization of mutants affected in membrane proteins.
Investigation of the role of outer membrane proteins, TonB pathway, and ATP synthase complex.

Main Results:

Outer membrane proteins involved in ferric-catechol siderophore receptor function are implicated in microcin H47 binding.
The TonB pathway is essential for the uptake of microcin H47 into the cell.
The ATP synthase complex is necessary for microcin H47 to exert its antibiotic effect.

Conclusions:

Microcin H47 utilizes outer membrane receptors and the TonB pathway for cellular entry.
The ATP synthase complex is a potential target for microcin H47, suggesting a novel mechanism of action for peptide antibiotics.