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Cyanocobalamin-dependent enzyme system

Molecular classification
Enzyme
01

Overview

The cyanocobalamin-dependent enzyme system refers to enzymes that require cobalamin (vitamin B12) as a cofactor for their catalytic activity. Cyanocobalamin is a synthetic form of vitamin B12 commonly used in supplements and laboratory studies. Within cells, it is converted into the active coenzyme forms: methylcobalamin and adenosylcobalamin. These active forms are essential for the function of several key enzymes in both prokaryotic and eukaryotic organisms, including methionine synthase and methylmalonyl-CoA mutase. Deficiency or dysfunction leads to impaired DNA synthesis/repair and accumulation of toxic metabolites.

Other names
Vitamin B12-dependent enzymesCobalamin-dependent enzyme system
02

Mechanism of action

Cofactor participates directly via organometallic chemistry/radical generation/methyl transfer

03

Biological functions

Methionine synthesisEnergy metabolismDNA synthesisDNA repairRearrangement reactionsDehalogenation (in bacteria)Riboswitch-mediated gene regulation (in bacteria)
04

Disease associations

Megaloblastic anemiaNeurological disease
05

Safety considerations

Deficiency can lead to severe health issuesGenetic defects affecting cobalamin processing can cause rare disorders

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