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Information on EC 2.5.1.151 - alkylcobalamin dealkylase

for references in articles please use BRENDA:EC2.5.1.151
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IUBMB Comments
This mammalian enzyme, which is cytosolic, can bind internalized methylcob(III)alamin and adenosylcob(III)alamin and process them to cob(I)alamin using the thiolate of glutathione for nucleophilic displacement. The product remains bound to the protein, and, following its oxidation to cob(II)alamin, is transferred by the enzyme, together with its interacting partner MMADHC, directly to downstream enzymes involved in adenosylcob(III)alamin and methylcob(III)alamin biosynthesis. In addition to its dealkylase function, the enzyme also catalyse an entirely different decyanase reaction with cyanocob(III)alamin (cf. EC 1.16.1.6, cyanocobalamin reductase).
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Word Map
The enzyme appears in viruses and cellular organisms
Reaction Schemes
Synonyms
cblC, MMACHC, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
an alkylcobalamin + [alkylcobalamin reductase] + glutathione = cob(I)alamin-[alkylcobalamin reductase] + an S-alkylglutathione
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