ABCB4

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ATP-binding cassette, sub-family B (MDR/TAP), member 4
Identifiers
Symbols ABCB4; ABC21; GBD1; MDR2; MDR2/3; MDR3; PFIC-3; PGY3
External IDs OMIM171060 MGI97569 HomoloGene113698 GeneCards: ABCB4 Gene
EC number 3.6.3.44
RNA expression pattern
PBB GE ABCB4 207819 s at tn.png
PBB GE ABCB4 209994 s at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 5244 18670
Ensembl ENSG00000005471 ENSMUSG00000042476
UniProt P21439 P21440
RefSeq (mRNA) NM_000443.3 NM_008830.2
RefSeq (protein) NP_000434.1 NP_032856.2
Location (UCSC) Chr 7:
87.03 – 87.11 Mb
Chr 5:
8.89 – 8.96 Mb
PubMed search [1] [2]

Multidrug resistance protein 3 is a protein that in humans is encoded by the ABCB4 gene.[1][2][3] ABCB4 is associated with progressive familial intrahepatic cholestasis type 3.

The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance as well as antigen presentation. This gene encodes a full transporter and member of the p-glycoprotein family of membrane proteins with phosphatidylcholine as its substrate (flippase activity). The function of this protein has not yet been determined; however, it may involve transport of phospholipids from liver hepatocytes into bile. Alternative splicing of this gene results in several products of undetermined function.[3]

References

  1. ^ Van der Bliek AM, Baas F, Ten Houte de Lange T, Kooiman PM, Van der Velde-Koerts T, Borst P (Mar 1988). "The human mdr3 gene encodes a novel P-glycoprotein homologue and gives rise to alternatively spliced mRNAs in liver". EMBO J 6 (11): 3325–31. PMC 553787. PMID 2892668. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=553787. 
  2. ^ Rosmorduc O, Hermelin B, Poupon R (Apr 2001). "MDR3 gene defect in adults with symptomatic intrahepatic and gallbladder cholesterol cholelithiasis". Gastroenterology 120 (6): 1459–67. doi:10.1053/gast.2001.23947. PMID 11313316. 
  3. ^ a b "Entrez Gene: ABCB4 ATP-binding cassette, sub-family B (MDR/TAP), member 4". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=5244. 

Further reading

External links




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