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Insights into the structure-function relationship of Brugia malayi thymidylate kinase (BmTMK).
Lymphatic filariasis is a debilitating disease caused by lymph dwelling nematodal parasites like Wuchereria bancrofti, Brugia malayi and Brugia timori. Thymidylate kinase of B. malayi is a key enzyme in the de novo and salvage pathways for thymidine 5'-triphosphate (dTTP) synthesis. Therefore, B. malayi thymidylate kinase (BmTMK) is an essential enzyme for DNA biosynthesis and an important drug target to rein in filariasis. In the present study, the structural and functional changes associated with recombinant BmTMK, in the presence of protein denaturant GdnHCl, urea and pH were studied. GdnHCl and urea induced unfolding of BmTMK is non-cooperative and influence the functional property of the enzyme much lower than their Cm values. The study delineate that BmTMK is more prone to ionic perturbation. The dimeric assembly of BmTMK is an absolute requirement for enzymatic acitivity and any subtle change in dimeric conformation due to denaturation leads to loss of enzymatic activity. The pH induced changes on structure and activity suggests that selective modification of active site microenvironment pertains to difference in activity profile. This study also envisages that chemical moieties which acts by modulating oligomeric assembly, could be used for better designing of inhibitors against BmTMK enzyme.
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