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GENE AND PROTEIN SUMMARY

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Gene name

ERBB3

Description

v-erb-b2 erythroblastic leukemia viral oncogene homolog 3 (avian)

Protein class

Candidate cancer biomarkers, Enzymes, Kinases, Mapped to UniProt SWISS-PROT, Potential transmembrane proteins, Potentially secreted proteins

Protein evidence

Medium

Entrez gene summary

This gene encodes a member of the epidermal growth factor receptor (EGFR) family of receptor tyrosine kinases. This membrane-bound protein has a neuregulin binding domain but not an active kinase domain. It therefore can bind this ligand but not convey the signal into the cell through protein phosphorylation. However, it does form heterodimers with other EGF receptor family members which do have kinase activity. Heterodimerization leads to the activation of pathways which lead to cell proliferation or differentiation. Amplification of this gene and/or overexpression of its protein have been reported in numerous cancers, including prostate, bladder, and breast tumors. Alternate transcriptional splice variants encoding different isoforms have been characterized. One isoform lacks the intermembrane region and is secreted outside the cell. This form acts to modulate the activity of the membrane-bound form. Additional splice variants have also been reported, but they have not been thoroughly characterized. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

14 in total
4 with predicted TM region
5 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Plasma membrane

Additional location(s)

Cytoskeleton (Actin filaments) 

Staining summary

Staining of plasma membrane in all three cell lines with additional staining of cytoskeleton (actin filaments) in U-2 OS.

Reliability (Single)

Antibodies in assay

CAB025331
 

NORMAL TISSUE & ORGAN SUMMARY

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Staining summary

Most normal tissues showed moderate cytoplasmic staining often combined with membranous immunoreactivity. Strong immunoreactivity was for example observed in gastric parietal cells, renal tubuli, placental trophoblasts and astrocytes.

Tissue specificity

Staining in 64 out of 79 cell types

Reliability (Single)

Antibodies in assay

CAB025331
 

Organ

No of cell types

Antibody staining

CNS (brain) 11
Hematopoietic (blood) 8
Liver and pancreas 5
Digestive (GI-tract) 13
Respiratory (lung) 4
Cardiovascular 1
Female tissues 13
Placenta 1
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 12
Endocrine tissues 3

Level of antibody staining





Strong
Moderate
Weak
Negative

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 81% of the cancers

Antibodies in assay

CAB025331
 

Tissue

Cancer staining

Normal tissue
staining

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

Tissue

Cancer staining

Normal tissue
staining

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

CAB025331

CAB025331

A-431 Skin High
Weak
A-549 Lung Low
CACO-2 Colon Medium
HEK 293 Embryonal kidney Low
HeLa Cervix Low
Hep-G2 Liver High
MCF-7 Pleural effusion High
PC-3 Bone marrow Medium
RT-4 Urinary bladder High
U-2 OS Bone Low
Moderate
U-251 MG Brain Low
Moderate

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

CAB025331 mAb