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GENE AND PROTEIN SUMMARY

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Gene name

PSMB8

Description

proteasome (prosome, macropain) subunit, beta type, 8 (large multifunctional peptidase 7)

Protein class

Enzymes, Mapped to UniProt SWISS-PROT, Peptidases

Protein evidence

High

Entrez gene summary

The proteasome is a multicatalytic proteinase complex with a highly ordered ring-shaped 20S core structure. The core structure is composed of 4 rings of 28 non-identical subunits; 2 rings are composed of 7 alpha subunits and 2 rings are composed of 7 beta subunits. Proteasomes are distributed throughout eukaryotic cells at a high concentration and cleave peptides in an ATP/ubiquitin-dependent process in a non-lysosomal pathway. An essential function of a modified proteasome, the immunoproteasome, is the processing of class I MHC peptides. This gene encodes a member of the proteasome B-type family, also known as the T1B family, that is a 20S core beta subunit. This gene is located in the class II region of the MHC (major histocompatibility complex). Expression of this gene is induced by gamma interferon and this gene product replaces catalytic subunit 3 (proteasome beta 5 subunit) in the immunoproteasome. Proteolytic processing is required to generate a mature subunit. Two alternative transcripts encoding two isoforms have been identified; both isoforms are processed to yield the same mature subunit. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

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

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Vesicles, Cytoskeleton (Cytokinetic bridge)

Additional location(s)

 

Staining summary

Staining of vesicles and cytoskeleton (cytokinetic bridge) in HeLa and U-2 OS.

Reliability (Single)

Antibodies in assay

HPA050327
 

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Ubiquitous cytoplasmic and nuclear expression.

Tissue specificity

Expressed in 65 out of 80 cell types

Reliability (APE)

High

Antibodies in assay

HPA046995, HPA050327
 

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 12
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 85% of the cancers

Antibodies in assay

HPA046995, HPA050327
 

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

HPA046995

HPA050327

HPA050327

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

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

HPA046995 pAb
HPA050327 pAb