Bromhexine and its inhibitory effect on lipase - kinetics and structural study.

Area of Science:

• Biochemistry
• Enzymology
• Microbiology

Background:

• Lipase is a key exoenzyme utilized by pathogenic bacteria, such as Pseudomonas, to degrade host extracellular matrix for invasion.
• Understanding lipase inhibition is vital for developing novel therapeutic strategies against bacterial infections.

Purpose of the Study:

• To investigate bromhexine, a mucolytic drug, as a potential inhibitor of bacterial lipase.
• To characterize the mechanism and kinetics of lipase inhibition by bromhexine.

Main Methods:

• Purification of lipase and determination of its molecular weight using SDS-PAGE.
• Enzyme inhibition assays to determine IC50 and Ki values.
• Kinetic analysis using Arrhenius plots and fluorescence spectroscopy to study enzyme-drug interactions.

Main Results:

• Bromhexine was identified as a competitive inhibitor of lipase with IC50 and Ki values of 0.049 mM and 0.02 mM, respectively.
• Arrhenius plot analysis indicated that bromhexine reduces the activation energy of the lipase-catalyzed reaction.
• Fluorescence measurements demonstrated that bromhexine binding induces structural changes in the lipase enzyme.

Conclusions:

• Bromhexine acts as a competitive inhibitor of lipase, reducing its activation energy and causing structural alterations.
• The findings suggest that bromhexine's lipase inhibitory activity has potential therapeutic applications in medicine, particularly for combating bacterial infections.