Comparative specificities of trehalases from various species

Area of Science:

• Biochemistry
• Enzymology
• Carbohydrate Chemistry

Background:

• Trehalases are enzymes that hydrolyze trehalose, a disaccharide found in various organisms.
• Understanding trehalase specificity is important for various applications, including biotechnology and medicine.

Purpose of the Study:

• To investigate the catalytic specificities of trehalases from different species.
• To identify key structural features of trehalose analogs that influence substrate binding and hydrolysis.

Main Methods:

• Enzymatic assays were performed using various trehalose derivatives and analogs.
• Trehalases from Pseudomonas fluorescens, Melolontha vulgaris, porcine, and human kidneys were used.

Main Results:

• alpha,Beta-trehalose, beta,beta-trehalose, 6,6'dideoxy alpha,alpha-trehalose, and alpha-D-xylopyranosyl alpha-D-xylopyranoside were not substrates or inhibitors.
• Substrates with an intact alpha-D-glucopyranosyl residue, such as 6'deoxy alpha,alpha-trehalose, were hydrolyzed by all tested trehalases.
• alpha-D-glucopyranosyl alpha-D-mannopyranoside and alpha,alpha-trehalosamine acted as competitive inhibitors.

Conclusions:

• The primary alcohol group at C-6 is essential for trehalase activity.
• Equatorial configurations of hydroxyl groups at C-2, C-3, and C-4 are important for substrate recognition.
• Modifications at the C-2 position of the substrate significantly impact catalytic activity.