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P5931

Sigma-Aldrich

Phosphatase, Alkaline from Escherichia coli

lyophilized powder, 30-60 units/mg protein (in glycine buffer)

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Synonym(s):
Orthophosphoric-monoester phosphohydrolase (alkaline optimum)
CAS Number:
Enzyme Commission number:
EC Number:
MDL number:
eCl@ss:
42010105
NACRES:
NA.54

form

lyophilized powder

Quality Level

specific activity

30-60 units/mg protein (in glycine buffer)

composition

Protein, ~50% biuret

storage temp.

−20°C

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1 of 4

This Item
P4252P7923P6774
form

lyophilized powder

form

ammonium sulfate suspension

form

buffered aqueous glycerol solution

form

buffered aqueous solution

Quality Level

200

Quality Level

300

Quality Level

200

Quality Level

200

storage temp.

−20°C

storage temp.

2-8°C

storage temp.

2-8°C

storage temp.

2-8°C

composition

Protein, ~50% biuret

composition

-

composition

-

composition

-

General description

Alkaline phosphatase (ALP) of E.coli is a member of an enzyme group that possesses intragenic complementation.

application

Alkaline phosphatase is used for conjugation to antibodies and other proteins for ELISA, Western blotting, and histochemical detection. It may be used for protein labeling when high sensitivity is required. Product P5931 has been used during immunoblots to treat cell membranes prior to Tau1 incubation.
The enzyme from Sigma has been used to develop a synthetic nanopore membrane. This membrane mimics protein channels that are regulated by phosphorylation/dephosphorylation and uses an aligned array of carbon nanotubes (CNTs) impregnated in a polystyrene matrix.

Biochem/physiol Actions

Alkaline phosphatase, from Escherichia coli, is a dimeric, non-glycosylated protein which mainly reside in the periplasmic space. Three known isoforms exist. The enzyme requires zinc, and is activated by magnesium. E. coli akaline phosphatase has a broad specificity for phosphate esters.
The enzyme is a phosphohydrolase having an optimal pH of 10 in vitro. The actual optimum pH varies depending on the nature and concentration of the substrate, the type of buffer, the phosphate acceptor, and to some extent the nature of the isoenzymes. It catalyzes the hydrolysis of phosphate monoesters such as p-nitrophenyl phosphate, phenyl phosphate, phenolphthalein phosphate, α-glycerol phosphate, β-glycerol phosphate, 2-phosphorylglycerate, triosephosphate, glucose-6-phosphate, glucose 1-phosphate, fructose 1-phosphate, fructose 6-phosphate, adenosine 5-phosphate adenosine 3-phosphate, phosphoenolpyruvate, and β-nicotinamide adenine dinucleotide phosphate. The activity is inhibited by 1,10-phenanthroline monohydrate, diethylenetriaminepentaacetic acid, ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid, and ethylenediaminetetraacetic acid disodium salt dihydrate.

Unit Definition

One unit will hydrolyze 1.0 μmole of p-nitrophenyl phosphate per min at pH 10.4 at 37 °C.

Physical form

Lyophilized powder containing Tris buffer salts, MgSO4, and ZnSO4

Preparation Note

Chromatographically purified

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


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Characterization of Heterodimeric Alkaline Phosphatases from Escherichia coli: An Investigation of Intragenic Complementation
Hehir MJ, et al.
Journal of molecular biology, 304(4), 645-656 (2000)
1.Reid, T., and Wilson
E. coli Alkaline Phosphatase,The Enzymes, 3rd Ed. Vol. 4, 4, 373-373 (1971)
Alkaline phosphatase from Thermotoga neapolitana.
A Savchenko et al.
Methods in enzymology, 331, 298-305 (2001-03-27)
Sergey Korshunov et al.
Molecular microbiology, 113(1), 22-39 (2019-10-16)
The structure of free cysteine makes it vulnerable to oxidation by molecular oxygen; consequently, organisms that live in oxic habitats have acquired the ability to import cystine as a sulfur source. We show that cystine imported into Escherichia coli can
R A Anderson et al.
Proceedings of the National Academy of Sciences of the United States of America, 72(1), 394-397 (1975-01-01)
To facilitate the study of individual metal binding sites of polymeric metalloproteins, conversion of exchange-labile Co(II) in E. coli alkaline phosphatase (EC 3.1.3.1) to exchange-inert Co(III) was examined. Oxidation of Co(II) alkaline phosphatase with hydrogen peroxide results in a single

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