Related Experiment Video
Updated: Aug 8, 2025
13:13
Biochemical Measurement of Neonatal Hypoxia
Published on: August 24, 2011
14.1K
Xanthine Oxidase-A Personal History
1Department of Biochemistry, University of California, Riverside, CA 92521, USA.
Molecules (Basel, Switzerland)
|February 25, 2023
Summary
Researchers have elucidated the reaction mechanisms of xanthine oxidase and related enzymes through collaborative laboratory efforts. This work provides key insights into enzyme function and biochemical pathways.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Xanthine oxidase is a crucial enzyme involved in purine metabolism.
- Understanding its reaction mechanism is vital for comprehending related metabolic disorders.
Purpose of the Study:
- To provide a personal perspective on the established reaction mechanism of xanthine oxidase and related enzymes.
- To synthesize findings from multiple laboratories, including the author's own research.
Main Methods:
- Review of experimental data from various research groups.
- Analysis of established biochemical and kinetic studies.
- Integration of findings on enzyme structure and function.
Main Results:
- The reaction mechanism of xanthine oxidase has been progressively elucidated.
- Key intermediates and catalytic steps have been identified.
- Similarities and differences in mechanisms among related enzymes have been highlighted.
Conclusions:
- Significant progress has been made in understanding xanthine oxidase catalysis.
- This collective knowledge is foundational for future research in purine metabolism and enzyme engineering.
Related Concept Videos
01:17Oxidation of Phenols to Quinones
3.3K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.3K
01:15Pyruvate Oxidation
160.1K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
160.1K
01:43Electron Transport Chain: Complex III and IV
7.8K
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...
7.8K
01:19Phase I Oxidative Reactions: Overview
322
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
322
01:27Protein Import into the Peroxisomes
3.6K
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
3.6K
01:58X-Inactivation
39.0K
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
39.0K