Jack Bean Urease

Jack bean urease is a nickel-containing enzyme isolated from jack beans that catalyzes the hydrolysis of urea, making it a classic model for studying metalloenzyme chemistry. At its active site, two nickel ions coordinate urea and activate a water molecule, enabling cleavage of the carbon-nitrogen bond and formation of ammonia and carbon dioxide. In chemistry, jack bean urease supports investigations of enzyme kinetics, metal-assisted catalysis, and inhibition, while its strong activity toward urea informs analytical assays, biosensor development, and studies of nitrogen cycling. Its well-characterized mechanism also provides a foundation for understanding urease-related environmental and biomedical processes.

Jack Bean Urease - Related Videos

Research

JoVE Journal - Biology

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean

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Cited by 15 •

2017

Promoter expression analyses are crucial to improving the understanding of gene regulation and the spatiotemporal expression of target genes. Herein we present a protocol to identify, isolate, and clone a plant promoter. Further, we describe the characterization of the nodule-specific promoter in the common bean hairy roots.

Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions

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Cited by 16 •

2014

Isothermal titration calorimetry measures heat flow released or absorbed in chemical reactions. This method can be used to quantify enzyme-catalysis. In this paper, the protocol for instrumental setup, experiment running, and data analysis is generally described, and applied to the characterization of enzymatic urea hydrolysis by jack bean urease.

Colorimetric Detection of a Bacterial Biomarker Using a Modified Litmus Test

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2025

This video demonstrates a colorimetric E. coli detection method, involving an E. coli biomarker activating a DNAzyme, leading to cleavage of RNA linkage and detachment of a DNAzyme-urease conjugate. A subsequent colorimetric assay detects the E. coli biomarker through ammonia-induced pH changes.

Research

JoVE Journal - Bioengineering
Free Sample

Characterizing Bacterial Volatiles using Secondary Electrospray Ionization Mass Spectrometry (SESI-MS)

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Cited by 40 •

2011

Secondary electrospray ionization mass spectrometry (SESI-MS) enables the detection of volatile organic compounds (VOCs) without the need for any sample pretreatment. This protocol provides instructions for the rapid (within minutes) characterization of bacterial VOCs using SESI-MS.

Colorimetric Detection of Bacteria Using Litmus Test

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Cited by 5 •

2016

We describe a protocol for colorimetric detection of E. coli using a modified litmus test that takes advantage of an RNA-cleaving DNAzyme, urease, and magnetic beads.

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