Microbial ureases: significance, regulation, and molecular characterization

Area of Science:

• Biochemistry
• Microbiology
• Enzymology

Background:

• Microbial ureases catalyze urea hydrolysis to ammonia and carbon dioxide.
• Urease activity contributes to diseases like urinary stones and gastric ulcers.
• Conversely, gastrointestinal microbial ureases benefit hosts by conserving urea nitrogen.

Purpose of the Study:

• To review the structure, function, and genetic basis of microbial ureases.
• To highlight the dual role of urease activity in microbial pathogenesis and host benefit.
• To discuss the enzymatic properties and genetic organization of urease.

Main Methods:

• Literature review of microbial urease research.
• Analysis of urease structure, subunit composition, and nickel cofactor.
• Examination of urease gene cloning and operon organization.

Main Results:

• Ureases are multimeric, nickel-containing enzymes crucial for urea metabolism.
• Eukaryotic and some bacterial ureases are homopolymeric, while Gram-negative bacterial ureases have distinct alpha, beta, and gamma subunits.
• Urease genes are often clustered in operons, with additional genes potentially involved in regulation or cofactor transport.

Conclusions:

• Microbial ureases exhibit diverse structures and functions, impacting both host health and nitrogen cycling.
• Understanding urease genetics and biochemistry is vital for addressing associated diseases and agricultural applications.
• Nickel is essential for urease catalytic activity.