商品编号


ENZ-277



品牌


Prospec



公司


Prospec-Tany



公司分类


Other




5mg

商品信息

Catalogue number

ENZ-277

Description

Urease (EC 3.5.1.5) is an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia. The reaction occurs as follows: (NH2)2CO + H2O = CO2 + 2NH3. In 1926 James Sumner showed that urease is a protein. Urease is found in bacteria, yeast and several higher plants. Characteristics: Active site metal: nickel(II); Molecular weight: 480 kDa or 545 kDa for Jack Bean Urease (calculated mass from the amino acid sequence); Optimum pH: 7.4; Optimum Temperature: 60 degrees Celsius; Enzymatic specificity: urea; Inhibitors: heavy metals. The multi-subunit enzyme usually has a 3:3 (alpha:beta) stoichiometry with a 2-fold symmetric structure (note that the image above gives the structure of the asymmetric unit, one third of the true
BIOLOG
ical assembly). An exceptional urease is found in Helicobacter pylori, which combines four of the regular six subunit enzymes in an overall tetrahedral assembly of 24 subunits (a12b12). This supra-molecular assembly is thought to confer additional st
ABI
lity for the enzyme in this organism, which functions to produce ammonia in order to neutralise gastric acid. The presence of urease is used in the diagnosis of Helicobacter species.

Source

Escherichia Coli.

Physical Appearance

Sterile Lyophilized Powder.

Formulation

Each mg of protein contains 420?g Potassium Phosphate and 30?g EDTA Na2.

Solubility

It is recommended to reconstitute the lyophilized Urease in sterile 18MΩ-cm H2O.

St
ABI
lity

Urease although stable at 4°C for 3 weeks, should be stored desiccated below -18°C.
Please prevent freeze-thaw cycles.

Purity

Greater than 95.0% as determined by:
(a) Analysis by RP-HPLC.
(b) Analysis by SDS-PAGE.

BIOLOG
ical Activity

The activity was found to be 141U/mg powder.

Unit Definition

One Unit oxidizes one micromole of NADH per minute at 25°C, at pH 7.6.

Usage

Prospec
's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.