ATP binding cassette subfamily D member 4
Dernière mise à jour 2 Aug 2022
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The ABCD4 gene provides instructions for making a protein that is involved in the conversion of vitamin B12 (also known as cobalamin) into one of two molecules, adenosylcobalamin (AdoCbl) or methylcobalamin (MeCbl). AdoCbl is required for the normal function of an enzyme known as methylmalonyl CoA mutase. This enzyme helps break down certain protein building blocks (amino acids), fat building blocks (fatty acids), and cholesterol. AdoCbl is called a cofactor because it helps methylmalonyl CoA mutase carry out its function. MeCbl is also a cofactor, but for an enzyme known as methionine synthase. This enzyme converts the amino acid homocysteine to another amino acid, methionine. The body uses methionine to make proteins and other important compounds.
Normal function
The ABCD4 gene provides instructions for making a protein that is involved in the conversion of vitamin B12 (also known as cobalamin) into one of two molecules, adenosylcobalamin (AdoCbl) or methylcobalamin (MeCbl). AdoCbl is required for the normal function of an enzyme known as methylmalonyl CoA mutase. This enzyme helps break down certain protein building blocks (amino acids), fat building blocks (fatty acids), and cholesterol. AdoCbl is called a cofactor because it helps methylmalonyl CoA mutase carry out its function. MeCbl is also a cofactor, but for an enzyme known as methionine synthase. This enzyme converts the amino acid homocysteine to another amino acid, methionine. The body uses methionine to make proteins and other important compounds.
The ABCD4 protein is found in the membrane that surrounds cell structures called lysosomes. Lysosomes are compartments within cells in which enzymes digest and recycle materials. In the lysosomal membrane, the ABCD4 protein interacts with another protein called LMBD1 (produced from the LMBRD1 gene). Together, these two proteins transport vitamin B12 out of lysosomes, making it available for further processing into AdoCbl and MeCbl.
Conditions referring to this gene or chromosome
Other names
69 kDa peroxisomal ABC-transporter
ABC41
ATP-binding cassette sub-family D member 4
ATP-binding cassette, sub-family D (ALD), member 4
EST352188
MAHCJ
P70R
P79R
peroxisomal membrane protein 69
PMP69
PMP70-related protein
PXMP1-L
PXMP1L
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Lectures complémentaires et références
- ATP binding cassette subfamily D member 4; MedlinePlus, National Library of Medicine.
- Coelho D, Kim JC, Miousse IR, Fung S, du Moulin M, Buers I, Suormala T, Burda P, Frapolli M, Stucki M, Nurnberg P, Thiele H, Robenek H, Hohne W, Longo N, Pasquali M, Mengel E, Watkins D, Shoubridge EA, Majewski J, Rosenblatt DS, Fowler B, Rutsch F, Baumgartner MR. Mutations in ABCD4 cause a new inborn error of vitamin B12 metabolism. Nat Genet. 2012 Oct;44(10):1152-5. doi: 10.1038/ng.2386. Epub 2012 Aug 26.
- Deme JC, Hancock MA, Xia X, Shintre CA, Plesa M, Kim JC, Carpenter EP, Rosenblatt DS, Coulton JW. Purification and interaction analyses of two human lysosomal vitamin B12 transporters: LMBD1 and ABCD4. Mol Membr Biol. 2014 Nov-Dec;31(7-8):250-61. doi: 10.3109/09687688.2014.990998.
- Kim JC, Lee NC, Hwu PW, Chien YH, Fahiminiya S, Majewski J, Watkins D, Rosenblatt DS. Late onset of symptoms in an atypical patient with the cblJ inborn error of vitamin B12 metabolism: diagnosis and novel mutation revealed by exome sequencing. Mol Genet Metab. 2012 Dec;107(4):664-8. doi: 10.1016/j.ymgme.2012.10.005. Epub 2012 Oct 16.
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