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GENE AND PROTEIN SUMMARY

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Gene name

ABCB4

Description

ATP-binding cassette, sub-family B (MDR/TAP), member 4

Protein class

Enzymes, Mapped to UniProt SWISS-PROT, Potential transmembrane proteins, Transporters

Protein evidence

Medium

Entrez gene summary

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. 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. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

7 in total
5 with predicted TM region
0 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Pending subcellular analysis

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Membranous expression in most glandular epithelial cells, high in liver.

Tissue specificity

Expressed in 30 out of 83 cell types

Reliability (APE)

Medium

Antibodies in assay

CAB004498, HPA049395, HPA053288
 

Organ

No of cell types

Protein expression

CNS (brain) 11
Hematopoietic (blood) 8
Liver and pancreas 5
Digestive (GI-tract) 13
Respiratory (lung) 4
Cardiovascular 1
Female tissues 13
Placenta 2
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 15
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 68% of the cancers

Antibodies in assay

CAB004498, HPA049395, HPA053288
 

Tissue

Cancer staining

Protein
expression of
normal tissue

Breast cancer
 
Carcinoid
 
Cervical cancer
 
 
Colorectal cancer
 
 
Endometrial cancer
 
 
Glioma
 
Head and neck cancer
 
 
Liver cancer
 
 
Lung cancer
 
 
Lymphoma
 
 
 

Tissue

Cancer staining

Protein
expression of
normal tissue

Melanoma
 
Ovarian cancer
 
Pancreatic cancer
 
Prostate cancer
 
Renal cancer
 
Skin cancer
 
Stomach cancer
 
 
Testis cancer
 
Thyroid cancer
 
Urothelial cancer
 

Level of antibody staining





Strong
Moderate
Weak
Negative

CELL LINE SUMMARY

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RNA evidence

Low
 

Cell line

Cell origin

RNA abundance

IH staining

IF intensity

CAB004498

HPA049395

HPA053288

 

A-431 Skin Not detected

-

A-549 Lung Low

-

CACO-2 Colon Low

-

HEK 293 Embryonal kidney Low

-

HeLa Cervix Not detected

-

Hep-G2 Liver Low

-

MCF-7 Pleural effusion Low

-

PC-3 Bone marrow Not detected

-

RT-4 Urinary bladder Low

-

U-2 OS Bone Low

-

U-251 MG Brain Not detected

-

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

CAB004498 mAb
HPA049395 pAb
HPA053288 pAb