Defective ABCD4 does not transport Cbl from lysosomal lumen to cytosol

Stable Identifier
R-HSA-5683325
Type
Reaction [transition]
Species
Homo sapiens
Compartment
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ATP-binding cassette sub-family D member 4 (ABCD4) is thought to mediate the lysosomal export of cobalamin (Cbl aka vitamin B12) into the cytosol, making it available for the production of Cbl cofactors. Cbl is an important cofactor for correct haematological and neurological functions. Defects in ABCD4 can cause methylmalonic aciduria and homocystinuria, cblJ type (MAHCJ; MIM:614857), a genetically heterogeneous metabolic disorder of Cbl metabolism characterised by decreased levels of the coenzymes adenosylcobalamin (AdoCbl) and methylcobalamin (MeCbl). Clinically, symptoms include feeding difficulties, poor growth, hypotonia, lethargy, anaemia and delayed development. Mutations causing MAHCJ include Y319C and E583Lfs*9 (Coelho et al. 2012).

Literature References
PubMed ID Title Journal Year
22922874 Mutations in ABCD4 cause a new inborn error of vitamin B12 metabolism

Coelho, D, Kim, JC, Miousse, IR, Fung, S, du Moulin, M, Buers, I, Suormala, T, Burda, P, Frapolli, M, Stucki, M, Nürnberg, P, Thiele, H, Robenek, H, Höhne, W, Longo, N, Pasquali, M, Mengel, E, Watkins, D, Shoubridge, EA, Majewski, J, Rosenblatt, DS, Fowler, B, Rutsch, F, Baumgartner, MR

Nat. Genet. 2012
Participants
Participant Of
Catalyst Activity
Catalyst Activity
Title
ATPase activity, coupled to transmembrane movement of substances of ABCD4 mutants [lysosomal membrane]
Physical Entity
Activity
Normal reaction
Disease
Name Identifier Synonyms
homocystinuria 9263 cystathionine beta synthase deficiency, cystathionine synthase deficiency, Homocystinuria (disorder), CBS deficiency
methylmalonic acidemia 14749 METHYLMALONICACIDURIA DUE TO METHYLMALONIC CoA MUTASE deficiency, METHYLMALONIC ACIDURIA, mut TYPE, METHYLMALONIC ACIDEMIA, cblB TYPE, methylmalonic aciduria mut type, METHYLMALONICACIDURIA, vitamin B12-RESPONSIVE, DUE TO DEFECT IN SYNTHESIS OF ADENOSYLCOBALAMIN--cbl B, methylmalonic aciduria cblB type, METHYLMALONIC ACIDURIA DUE TO METHYLMALONYL-CoA MUTASE DEFICIENCY, METHYLMALONIC ACIDURIA, VITAMIN B12-RESPONSIVE, DUE TO DEFECT IN SYNTHESIS OF ADENOSYLCOBALAMIN, cblA TYPE, methylmalonic aciduria, METHYLMALONIC ACIDURIA, VITAMIN B12-RESPONSIVE, DUE TO DEFECT IN SYNTHESIS OF ADENOSYLCOBALAMIN, cblB TYPE, METHYLMALONIC ACIDEMIA, cblA TYPE, METHYLMALONICACIDURIA, vitamin B12-RESPONSIVE, DUE TO DEFECT IN SYNTHESIS OF ADENOSYLCOBALAMIN--cbl A
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