Fields »

GENE AND PROTEIN SUMMARY

? »

Gene name

PSAP

Description

prosaposin

Protein class

Mapped to UniProt SWISS-PROT, Potentially secreted proteins, Transporters

Protein evidence

High

Entrez gene summary

This gene encodes a highly conserved glycoprotein which is a precursor for 4 cleavage products: saposins A, B, C, and D. Each domain of the precursor protein is approximately 80 amino acid residues long with nearly identical placement of cysteine residues and glycosylation sites. Saposins A-D localize primarily to the lysosomal compartment where they facilitate the catabolism of glycosphingolipids with short oligosaccharide groups. The precursor protein exists both as a secretory protein and as an integral membrane protein and has neurotrophic activities. Mutations in this gene have been associated with Gaucher disease, Tay-Sachs disease, and metachromatic leukodystrophy. Alternative splicing results in multiple transcript variants encoding different isoforms. [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
3 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

? »

Show image »

Main location(s)

Vesicles

Additional location(s)

Golgi apparatus 

Staining summary

Staining of vesicles in U-2 OS, vesicles and Golgi in U-251MG and staining of Golgi in A-431.

Reliability (Single)

Antibodies in assay

HPA004426
 

NORMAL TISSUE & ORGAN SUMMARY

? »

Show image »

Expression summary

Granular cytoplasmic expression in all tissues.

Tissue specificity

Expressed in 78 out of 79 cell types

Reliability (APE)

High

Antibodies in assay

HPA004426, CAB004647
 

Organ

No of cell types

Protein expression

CNS (brain) 11
Hematopoietic (blood) 8
Liver and pancreas 5
Digestive (GI-tract) 12
Respiratory (lung) 4
Cardiovascular 1
Female tissues 12
Placenta 2
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 13
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

? »

Staining summary

Antibody staining in 100% of the cancers

Antibodies in assay

HPA004426, CAB004647
 

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

? »

RNA evidence

High
 

Cell line

Cell origin

RNA abundance

IH staining

IF intensity

HPA004426

CAB004647

HPA004426

A-431 Skin High
Moderate
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
Moderate
U-251 MG Brain High
Strong

ANTIBODY SUMMARY

? »

Antibody

Clonality

Validation

HPA004426 pAb
CAB004647 mAb