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GENE AND PROTEIN SUMMARY

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Gene name

ABCB1

Description

ATP-binding cassette, sub-family B (MDR/TAP), member 1

Protein class

Candidate cancer biomarkers, CD markers, Enzymes, Mapped to UniProt SWISS-PROT, Potential transmembrane proteins, Transporters

Protein evidence

High

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. The protein encoded by this gene is an ATP-dependent drug efflux pump for xenobiotic compounds with broad substrate specificity. It is responsible for decreased drug accumulation in multidrug-resistant cells and often mediates the development of resistance to anticancer drugs. This protein also functions as a transporter in the blood-brain barrier. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

4 in total
3 with predicted TM region
0 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Nucleus but not nucleoli, Cytoplasm, Focal Adhesions

Additional location(s)

 

Staining summary

Localized to the cytoplasm, nucleus and focal adhesion sites.

Reliability (APE)

Low

Antibodies in assay

CAB001716, HPA002199
 

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Membranous expression in a few tissues, most abundant in adrenal gland. Distinct expression in endothelial cells of CNS.

Tissue specificity

Expressed in 11 out of 82 cell types

Reliability (APE)

High

Antibodies in assay

CAB001716, HPA002199
 

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 14
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 23% of the cancers

Antibodies in assay

CAB001716, HPA002199
 

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

High
 

Cell line

Cell origin

RNA abundance

IH staining

IF intensity

CAB001716

HPA002199

CAB001716

HPA002199

A-431 Skin Not detected
ModerateModerate
A-549 Lung Low
CACO-2 Colon High
HEK 293 Embryonal kidney Medium
HeLa Cervix Low
Hep-G2 Liver High
MCF-7 Pleural effusion Not detected
PC-3 Bone marrow Not detected
RT-4 Urinary bladder Low
U-2 OS Bone Medium
WeakModerate
U-251 MG Brain Low
ModerateWeak

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

CAB001716 mAb
HPA002199 pAb