Related Experiment Video
Updated: Mar 22, 2026
10:42
Bioluminescence Imaging of NADPH Oxidase Activity in Different Animal Models
Published on: October 22, 2012
16.8K
NADPH OXIDASE: STRUCTURE AND ACTIVATION MECHANISMS (REVIEW). NOTE I
Summary
NADPH oxidase enzymes generate reactive oxygen species (ROS), crucial for biological processes. Dysregulation of these ROS, produced by NADPH oxidase, contributes to various pathological conditions.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- NADPH oxidase (nicotinamide adenine dinucleotide phosphate-oxidase) is a key enzyme system.
- It produces reactive oxygen species (ROS), which play dual roles in physiological and pathological processes.
- NOX isoforms are the primary source of ROS in biological systems.
Purpose of the Study:
- To describe the structure and function of NADPH oxidase.
- To highlight the role of ROS in biological systems.
- To explain the activation mechanism of phagocytic NADPH oxidase.
Main Methods:
- The abstract does not specify methods, but implies biochemical and cellular analyses.
- Focuses on the enzymatic activity and protein interactions of NADPH oxidase.
- Describes the structural components of the enzyme complex.
Main Results:
- NADPH oxidase generates superoxide anion, a reactive free-radical, from NADPH and molecular oxygen.
- The enzyme comprises membrane proteins (gp91phox, p22phox) forming flavocytochrome b558 and cytosolic regulatory subunits (p40phox, p47phox, p67Phox).
- Activation involves complex protein interactions initiating ROS production.
Conclusions:
- NADPH oxidase is a critical enzyme in ROS generation.
- ROS are essential in physiological functions but harmful in pathological states.
- Understanding NADPH oxidase structure and activation is vital for studying ROS-related diseases.
More Related Videos
Related Concept Videos
01:34The Z-Scheme of Electron Transport in Photosynthesis
14.9K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
14.9K
01:26Oxygenic Photosynthesis
939
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
939
01:43Electron Transport Chain: Complex III and IV
9.6K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
9.6K
01:27Photosystem I
71.3K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
71.3K
01:29The Photochemical Reaction Center
5.8K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
5.8K
01:22Photosystem II
80.0K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
80.0K