Abstract

Efficient debridement of the wound bed following the removal of microbial load prevents its progression into a chronic wound. Bacterial infection and excessive proteolysis characterize impaired healing and therefore, their inhibition might restore the disturbed equilibrium in the healing process. Human placental extract exhibits reversible, non-competitive inhibition towards Proteinase K, a microbial protease, by stabilizing it against auto-digestion. Scattering and fluorescence studies followed by biochemical analysis indicated the involvement of a glycan moiety. Surface plasmon resonance demonstrated specific interaction of heparin with Proteinase K having Kd in μM range. Further, Proteinase K contains sequence motifs similar to other heparin-binding proteins. Molecular docking revealed presence of clefts suitable for binding of heparin-derived oligosaccharides. Comprehensive analysis of this inhibitory property of placental extract partly explains its efficacy in curing wounds with common bacterial infections.

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