Phosphatase enzymes catalyse hydrolysis of phosphoric acid esters of various alcohols, e.g. a hexose phosphate, to yield the alcohol and free inorganic phosphate. This may be a way of recycling phosphate in the cell, and the level of phosphate may be elevated under conditions of phosphate starvation (in algae for example). Acid phosphatases have pH optima below 7, whereas alkaline phosphatases are most active above pH 7. Commercial quantities of acid phosphatase are obtained from plant sources e.g. potato and wheat germ, whereas similar quantities of alkaline phosphatase are obtained from animal intestine and bacteria.
Function:
Acts on tyrosine phosphorylated proteins, low-MW aryl phosphates and natural and synthetic acyl phosphates. Isoform 3 does not possess phosphatase activity.
Subunit:
Isoform 1 interacts with the SH3 domain of SPTAN1. There is no interaction observed for isoforms 2 or 3. Interacts with EPHA2; dephosphorylates EPHA2. Interacts with EPHB1.
Subcellular Location:
Cytoplasm.
Tissue Specificity:
T-lymphocytes express only isoform 2.
Similarity:
Belongs to the low molecular weight phosphotyrosine protein phosphatase family.
SWISS:
P24666
Gene ID:
52
Database links:
Entrez Gene: 52 Human
Entrez Gene: 11431 Mouse
Entrez Gene: 631286 Mouse
Entrez Gene: 24161 Rat
Omim: 17300 Human
SwissProt: P24666 Human
SwissProt: Q9D358 Mouse
SwissProt: P41498 Rat
Unigene: 558296 Human
Unigene: 359831 Mouse
Unigene: 108187 Rat
Unigene: 202830 Rat
Unigene: 220315 Rat
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Paraformaldehyde-fixed, paraffin embedded (mouse brain); Antigen retrieval by boiling in sodium citrate buffer (pH6.0) for 15min; Block endogenous peroxidase by 3% hydrogen peroxide for 20 minutes; Blocking buffer (normal goat serum) at 37°C for 30min; Antibody incubation with (Acid Phosphatase) Polyclonal Antibody, Unconjugated (SL6291R) at 1:200 overnight at 4°C, followed by operating according to SP Kit(Rabbit) (sp-0023) instructionsand DAB staining.
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