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GENE AND PROTEIN SUMMARY

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Gene name

SSB

Description

Sjogren syndrome antigen B (autoantigen La)

Protein class

Mapped to UniProt SWISS-PROT

Protein evidence

High

Entrez gene summary

The protein encoded by this gene is involved in diverse aspects of RNA metabolism, including binding and protecting poly(U) termini of nascent RNA polymerase III transcripts from exonuclease digestion, processing 5' and 3' ends of pre-tRNA precursors, acting as an RNA chaperone, and binding viral RNAs associated with hepatitis C virus. Autoantibodies reacting with this protein are found in the sera of patients with Sjogren syndrome and systemic lupus erythematosus. [provided by RefSeq, Nov 2011]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

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

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Nucleoli, Nucleus but not nucleoli, Cytoplasm

Additional location(s)

 

Staining summary

Localized to the nucleus but excluded from the nucleoli or localized to the nucleoli and cytoplasm.

Reliability (APE)

Very low

Antibodies in assay

CAB004643, HPA012385, HPA017287
 

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Ubiquitous nuclear expression.

Tissue specificity

Expressed in 81 out of 82 cell types

Reliability (APE)

High

Antibodies in assay

CAB004643, HPA012385, HPA017287
 

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 98% of the cancers

Antibodies in assay

CAB004643, HPA012385, HPA017287
 

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

CAB004643

HPA012385

HPA017287

CAB004643

HPA012385

HPA017287

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

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

CAB004643 mAb
HPA012385 pAb
HPA017287 pAb