A9934
Aminopeptidase I from Streptomyces griseus
lyophilized powder, ≥200 units/mg protein
Synonyme(s) :
Leucine Aminopeptidase IV
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About This Item
Produits recommandés
Forme
lyophilized powder
Niveau de qualité
Activité spécifique
≥200 units/mg protein
Poids mol.
21 kDa by gel filtration
33 kDa by SDS-PAGE
Composition
Protein, 40-60% Lowry
Température de stockage
−20°C
Description générale
Aminopeptidase I from Streptomyces griseus is a thermostable enzyme with Glu131 and Tyr246 as key active site residues.
Application
Aminopeptidase I from Streptomyces griseus has been used:
- to test the biochar exposure effect on the enzyme activity
- in circular dichroism (CD) spectroscopy studies
- as a positive control in p-nitroanilide degradation assay
Actions biochimiques/physiologiques
Aminopeptidase I from S. griseus has a fairly broad specificity, being able to remove the N-terminal residue of most proteins, except where the penultimate residue is an imino acid. It contains two Zn2+ binding sites. Aminopeptidase I from S. griseus is inhibited by 1,10-phenanthroline and is activated six-fold by Ca2+, which also stabilizes it against heat inactivation. This monomeric zinc metalloprotein has an isoelectric point (pI) of 5.4.
Aminopeptidase I may also be used as a reagent in the assay of endoprotease activities with a synthetic substrate in a two-stage assay. In the first stage, the endoprotease cleaves a peptide, such as Z-Y-X-Leu-p-nitroanilide, with the X, Y, and Z residues being chosen according to the specificity of the endoprotease.
Conditionnement
Package size based on protein content.
Définition de l'unité
One unit will hydrolyze 1.0 μmole of L-leucine-p-nitroanilide to L-leucine and p-nitroaniline per min at pH 8.0, 25 °C and 3.0 mM substrate concentration.
Forme physique
Contains calcium acetate
Notes préparatoires
Reconstitute in 20 mM tricine, pH 8.0, with 0.05% bovine serum albumin. Dilute the enzyme with the reconstitution buffer to 0.15-0.3 U/mL for a working concentration. Solutions should be prepared fresh prior to use.
Autres remarques
Endopeptidase contaminant: Not more than: 0.01 U/mg protein (as μmole tyrosine equivalent per min released from casein.)
Mention d'avertissement
Danger
Mentions de danger
Conseils de prudence
Classification des risques
Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - STOT SE 3
Organes cibles
Respiratory system
Code de la classe de stockage
11 - Combustible Solids
Classe de danger pour l'eau (WGK)
WGK 1
Point d'éclair (°F)
Not applicable
Point d'éclair (°C)
Not applicable
Équipement de protection individuelle
Eyeshields, Gloves, type N95 (US)
Certificats d'analyse (COA)
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A heat-stable aminopeptidase with an N-terminal Ala-Pro-Asp-Ile-Pro-Leu sequence has been purified from Streptomyces griseus by heat treatment followed by gel-exclusion and anion-exchange chromatographic procedures. The enzyme is a monomeric zinc metalloenzyme showing an apparent molecular mass of 33 kDa by
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