Cow Milk Lactoferrin Possesses Several Catalytic Activities

Area of Science:

• Biochemistry
• Proteomics
• Enzymology

Background:

• Lactoferrin (LF) is an iron-binding glycoprotein found in milk and other secretions.
• LF has diverse attributed functions, including antimicrobial and immunomodulatory roles.
• Previous studies identified DNase, RNase, ATPase, phosphatase, and amylase activities in human and bovine LF.

Purpose of the Study:

• To investigate the enzymatic activities of lactoferrin (LF) from different breeds of cows.
• To compare the enzymatic profile of bovine LF with human LF.

Main Methods:

• Analysis of lactoferrin (LF) from the milk of seven different cow breeds.
• Enzymatic assays to detect peroxidase, protease, amylase, and phosphatase activities.
• Investigation of the effect of Mg²⁺ and Ca²⁺ ions on protease activity.

Main Results:

• Bovine lactoferrin (LF) demonstrated significant peroxidase, protease, amylase, and phosphatase activities.
• Protease activity was enhanced by the presence of Mg²⁺ and Ca²⁺ ions.
• ATPase activity was detected in only three of the seven bovine LF samples, unlike human LF.

Conclusions:

• The diverse enzymatic activities of bovine lactoferrin (LF) contribute to its complex physiological roles.
• These findings enhance understanding of LF's protective functions, particularly against microbial and viral infections.
• The study highlights species-specific differences in LF enzymatic profiles, such as ATPase activity.