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A8200 Sigma

Aminopeptidase from Aeromonas proteolytica

lyophilized powder, 50-150 units/mg protein



Related Categories 3.4.x.x Peptidases, 3.x.x.x Hydrolases, Aminopeptidase, Application Index, Biochemicals and Reagents,
Quality Level   PREMIUM
form   lyophilized powder
composition   Protein, ~40% biuret
solubility   H2O: soluble 0.9-1.1 mg/mL, clear, colorless
foreign activity   endopeptidase, essentially free
storage temp.   −20°C


General description

A zinc-containing enzyme.


100, 250 units in glass bottle

Preparation Note

Dissolves in water at 0.9-1.1 mg/mL concentration to form a clear, colorless solution.


Catalyzes the release of an N-terminal amino acid, preferentially leucine, but not glutamic or aspartic acids.

Unit Definition

One unit will hydrolyze 1.0 μmole of L-leucine p-nitroanilide to L-leucine and p-nitroaniline per min at pH 8.0 at 25 °C.

Physical form

Lyophilized powder containing tricine buffer, pH 8.0, zinc chloride and stabilizer.


Aminopeptidases are a family of widely distributed proteases, which may be used to study many significant biological processes such as protein maturation, hormone production, and peptide digestion. The enzyme has been used to measure the kinetic rate constant for the binding of bestatin, a general protease inhibitor, to aminopeptidase.

Biochem/physiol Actions

Aminopeptidase from Aeromonas proteolytica is involved in protein maturation, hormone production and peptide digestion.

Aminopeptidase from Aeromonas proteolytica is a metalloenzyme, which contains 2 atoms of Zn2+ in a single polypeptide with an approximate molecular weight of 29.5 kDa as determined by sedimentation. This enzyme has a high degree of stability, being stable even at temperatures of 70 °C for several hours. Partial inactivation occurs in 8 M urea. Maximum stability and activity are between pH 8.0-8.5. Aminopeptidase from Aeromonas proteolytica can function as an esterase.

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Safety Information

Signal word 
Hazard statements 
Precautionary statements 
NONH for all modes of transport
WGK Germany 
Protocols & Articles

Related Content

Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

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