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Cofactors and Coenzymes

Cofactors and Coenzymes

Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.

Cofactors and Coenzymes

Cofactors and Coenzymes

Enzymes are proteins made of amino acids. The functional group of each constituent amino acid catalyzes a wide variety of chemical reactions via ionic interactions or acid-base reactions. However, amino acids cannot catalyze oxidation-reduction and group transfer reactions and need to be aided by non-protein components called cofactors. Cofactors are also referred to as the chemical teeth of an enzyme.
Cofactors can be metallic ions or organic molecules called coenzymes. These types of helper...

Cofactors and Coenzymes

Cofactors and Coenzymes

Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.

Amino Acid Catabolism

Amino Acid Catabolism

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...

Enzymes

Enzymes

Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...

Amino Acid Biosynthetic Pathways

Amino Acid Biosynthetic Pathways

Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...

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Related Experiment Video

Updated: Jun 8, 2026

Quantification of Coenzyme A in Cells and Tissues

Quantification of Coenzyme A in Cells and Tissues

Published on: September 27, 2019

Cobalamin- and corrinoid-dependent enzymes.

Rowena G Matthews¹

¹Department of Biological Chemistry and Life Sciences Institute, University of Michigan, Ann Arbor MI 48109-2216, USA rmatthew@umich.edu.

Metal Ions in Life Sciences

|September 30, 2010

Summary

This summary is machine-generated.

This review covers cobalamin and corrinoid enzymes, essential for methyl transfer and radical generation. These enzymes utilize methylcobalamin or adenosylcobalamin prosthetic groups for critical biochemical reactions.

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Area of Science:

Biochemistry
Enzymology
Molecular Biology

Background:

Cobalamin and corrinoids are vital cofactors in numerous biological processes.
Enzymes utilizing these cofactors play crucial roles in metabolism and cellular function.

Purpose of the Study:

To review the literature on cobalamin- and corrinoid-containing enzymes.
To categorize these enzymes based on their prosthetic groups and catalytic mechanisms.

Main Methods:

Literature review of scientific publications.
Classification of enzymes based on prosthetic groups (methylcobalamin, adenosylcobalamin).
Analysis of catalyzed reactions (methyl transfer, radical generation).

Main Results:

Identified two main classes of cobalamin/corrinoid enzymes.
Class 1: Methylcobalamin-dependent enzymes catalyzing methyl transfer.
Class 2: Adenosylcobalamin-dependent enzymes catalyzing radical generation for rearrangements/eliminations.

Conclusions:

Cobalamin and corrinoid enzymes are diverse and essential for key metabolic pathways.
Understanding their mechanisms provides insights into fundamental biochemical processes.