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GENE AND PROTEIN SUMMARY

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Gene name

MDM4

Description

Mdm4 p53 binding protein homolog (mouse)

Protein class

Mapped to UniProt SWISS-PROT

Protein evidence

Medium

Entrez gene summary

This gene encodes a nuclear protein that contains a p53 binding domain at the N-terminus and a RING finger domain at the C-terminus, and shows structural similarity to p53-binding protein MDM2. Both proteins bind the p53 tumor suppressor protein and inhibit its activity, and have been shown to be overexpressed in a variety of human cancers. However, unlike MDM2 which degrades p53, this protein inhibits p53 by binding its transcriptional activation domain. This protein also interacts with MDM2 protein via the RING finger domain, and inhibits the latter's degradation. So this protein can reverse MDM2-targeted degradation of p53, while maintaining suppression of p53 transactivation and apoptotic functions. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Feb 2011]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

8 in total
0 with predicted TM region
0 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Vesicles

Additional location(s)

 

Staining summary

Staining of vesicles in all three cell lines.

Reliability (Single)

Antibodies in assay

HPA018919
 

NORMAL TISSUE & ORGAN SUMMARY

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Staining summary

Moderate to strong cytoplasmic and nuclear positivity was seen in most normal tissues.

Tissue specificity

Staining in 78 out of 82 cell types

Reliability (Single)

Antibodies in assay

HPA018919
 

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 2
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 14
Endocrine tissues 3

Level of antibody staining





Strong
Moderate
Weak
Negative

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 91% of the cancers

Antibodies in assay

HPA018919
 

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

 

HPA018919

A-431 Skin Medium

-

Strong
A-549 Lung Medium

-

CACO-2 Colon Medium

-

HEK 293 Embryonal kidney Medium

-

HeLa Cervix High

-

Hep-G2 Liver Medium

-

MCF-7 Pleural effusion Medium

-

PC-3 Bone marrow Medium

-

RT-4 Urinary bladder Medium

-

U-2 OS Bone Medium

-

Strong
U-251 MG Brain Medium

-

Strong

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

HPA018919 pAb