API-RO

Alkaline Phosphatase (AP)

grade I, from calf intestine

• Synonym(s): AP, Alkaline Phosphatase
• UNSPSC Code: 12352204
• EC Number: 3.1.3.1 (BRENDA, IUBMB)
• NACRES: NA.54
• Biological source: bovine (calf) intestine

Properties

• biological source: bovine (calf) intestine
• form: suspension
• packaging: pkg of 1,500 U (10108138001), pkg of 7,500 U (10108146001)
• manufacturer/tradename: Roche
• optimum pH: 8.0-10.5
• absorption: 7.6 at 278 nm (10 mg AP/ml)
• storage temp.: 2-8°C

Description

General description

At 37 °C with 4-nitrophenyl phosphate as the substrate, and diethanolamine as the buffer (400 U/mg at 25 °C with 4-nitrophenyl phosphate as the substrate, and glycine as the buffer)

Orthophosphoric-monoester phosphohydrolase (alkaline optimum)
Alkaline phosphatase catalyzes the removal of phosphate group from various compounds that are phosphorylated.[1] It hydrolyzes 5′-monophosphate groups from both DNA and RNA. It can also hydrolyze 5′-diphosphate and 5′-triphosphate groups from RNA.

Application

Selective cleavage of terminal phosphate groups from oligonucleotides and in protein nucleotide exchange and deliverance.[2][3] It has also been used to phosphorylate samples to distinguish between phosphate moieties present as phosphorylated glycans and phosphorylated amino acid residues.

Biochem/physiol Actions

Heat inactivation: AP activity is destroyed irreversibly by incubating the enzyme at 65 °C.
Denaturation is dependent on protein concentration - using less than 10 U/ml (0.1 mol/l glycine buffer, pH 10.5, 1 mmol/l MgCl₂ and 0.1 mmol/l ZnCl₂), AP is inactivated by a 10 minutes incubation at 65 °C.

Physical form

Suspension in 3.2 M ammonium sulfate solution, 1 mM MgCl₂, 0.1 mM ZnCl₂, pH approximately 7

Preparation Note

• Activator: Divalent metal ions (Mg²⁺, Co²⁺, Mn²⁺)
• Amino alcohols (2-amino-2-methyl-1-propanol, diethanolamine)

Note that high concentrations of amino alcohols can as well act as competitive inhibitors (e.g., monoethanolamine in diethanolamine).

Storage conditions (working solution): The suspension is offered at a c= approx. 5 mg/ml.
If this suspension is diluted only 5 to 10-fold with further 3.2 M ammonium sulfate solution, 1 mM MgCl₂, 0.1 mM ZnCl₂, pH approx. 7, we would expect from general experience that a stability for some weeks might be given provided it is stored at 4 °C (no guarantee!).

Analysis Note

Contaminants: <0.0004% PDE, <0.004% ADA and A-5-MP deaminase, each

Other Notes

AP is a dimer of identical or nearly identical subunits; each of which contains 2 molecules of Zn²⁺ , one tightly bound and necessary for structural stability, the other loosely bound and required for caytalytic activity. The active site contains a reactive serine.
In some mammals (e.g., humans), there are at least 3 distinguishable isoenzymes: the intestinal, the placental and the form found in bone/liver/kidney.

For life science research only. Not for use in diagnostic procedures.

Unit Conversion: 1 Roche unit (tested at +25 °C) corresponds to ~2 to 2.5 Sigma units (tested at +37 °C).
AP activity is not expressed in Armstrong units; a conversion factor for international units is not known.
Approx. 3.8 U (grade I AP) or 4.0 U (grade II AP) [+37 °C, 4-NPP as substrate, diethanolamine as buffer, pH 9.8] = 1 U [+25 °C, 4-NPP as substrate, glycine as buffer, pH 10.5].

Biochemica Information. 87 (grade I AP) :
1.0 U [+37 °C, QC assay conditions] = 0.79 U [+30 °C, QC assay conditions] = 0.57 U [+25 °C, QC assay conditions]

Safety Information

• Storage Class: 12 - Non Combustible Liquids
• wgk: WGK 1
• flash_point_f: does not flash
• flash_point_c: does not flash