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Phase I Reactions: Reductive Reactions

Phase I Reactions: Reductive Reactions

Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...

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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...

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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...

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Proteomic Analysis of Human Macrophage Polarization Under a Low Oxygen Environment

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Published on: January 7, 2019

Human carbonyl reductases.

Petra Malátková¹, Edmund Maser, Vladimír Wsól

¹Department of Biochemical Sciences, Faculty of Pharmacy, Charles University, Heyrovského 1203, CZ-50005 Hradec Králové, Czech Republic.

Current Drug Metabolism

|October 15, 2010

Summary

Human carbonyl reductases (CBR1, CBR3, CBR4) are crucial for metabolizing endogenous and exogenous compounds, acting as a defense system against toxicants and influencing physiological processes. Their roles in health and disease, including cancer, are explored.

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EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

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Published on: November 26, 2014

Area of Science:

Biochemistry
Molecular Biology
Pharmacology

Background:

Enzymatic carbonyl reduction converts ketones/aldehydes to alcohols, impacting endogenous signaling molecules and xenobiotic detoxification.
Aldo-keto reductases (AKR) and short-chain dehydrogenases/reductases (SDR) superfamilies catalyze these reactions.
Some enzymes exhibit pluripotency, metabolizing both endogenous and exogenous substrates.

Purpose of the Study:

To review current knowledge on human carbonyl reductases CBR1, CBR3, and CBR4.
To emphasize their role in defense against toxicants and their potential physiological functions and medical applications.
To consolidate recent literature on substrates, structure, expression, regulation, and disease association.

Main Methods:

Literature review of recent studies on CBR1, CBR3, and CBR4.
Screening for information on endogenous/exogenous substrates.
Analysis of 3D structure, tissue expression, polymorphisms, regulation, and pathological states.

Main Results:

CBR1, CBR3, and CBR4 belong to the SDR superfamily and metabolize diverse substrates.
These enzymes play a role in xenobiotic detoxification and endogenous compound metabolism.
Their involvement in pathological states, including cancer, is suggested.

Conclusions:

Human carbonyl reductases are vital for detoxification and physiological regulation.
Further research into their complex biological roles and medical applications is warranted.
Understanding CBR1, CBR3, and CBR4 is key to comprehending their impact on health and disease.