Cellular cobalamin transport and metabolism pathway (Cobalamin pathway)

The cellular cobalamin transport and metabolism pathway encompasses the series of proteins responsible for the uptake, intracellular trafficking, and enzymatic conversion of Vitamin B12 into its active cofactors. Key components include the CD320 receptor for cellular entry, the MMACHC and MMADHC proteins for intracellular processing, and the enzymes Methionine synthase (MTR) and Methylmalonyl-CoA mutase (MUT). These targets are essential for DNA synthesis and the maintenance of the nervous system, as they facilitate the conversion of homocysteine to methionine and methylmalonyl-CoA to succinyl-CoA. Genetic mutations in any of these components lead to serious metabolic disorders such as methylmalonic acidemia and homocystinuria. Pharmacological intervention typically involves high-dose administration of various cobalamin forms to overcome transport inefficiencies or enzymatic blocks.

Other names

Vitamin B12 transport and metabolismIntracellular cobalamin processingCbl pathway

Supplementation of cobalamin derivatives to bypass transport defects or provide substrates for deficient enzymes (MTR, MUT).