title: The inhibition of Clostridium chauvoei (jakari strain) neuraminidase activity by methanolic extracts of the stem barks of Tamarindus indicus and Combretum fragrans.
abstract: The inhibition of neuraminidase from Clostridium chauvoei (jakari strain) with partially purified methanolic extracts of some plants used in Ethnopharmacological practice was evaluated. Extracts of two medicinal plants, Tamarindus indicus and Combretum fragrans at 100-1000 microg/ml, both significantly reduced the activity of the enzyme in a dose-dependent fashion (P < 0.001). The estimated IC50 values for Tamarindus indicus and Combretum fragrans were 100 and 150 microg/ml respectively. Initial velocity studies conducted, using fetuin as substrate revealed a non-competitive inhibition with the Vmax significantly altered from 500 micromole min(-1) mg(-1) to 240 micromole min(-1) mg(-1) and 340 micromole min(-1) mg(-1) in the presence of Tamarindus indicus and Combretum fragrans respectively. The KM remained unchanged at 0.42 mM. The computed Index of physiological efficiency was reduced from 1.19min(-1) to 0.57min(-1) and 0.75min(-1) with Tamarindus indicus and Combretum fragrans as inhibitors respectively.
authors.affiliation: Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria. nickuseh@yahoo.com
authors.forename: N M
authors.initials: NM
authors.lastname: Useh
authors.forename: A J
authors.initials: AJ
authors.lastname: Nok
authors.forename: S F
authors.initials: SF
authors.lastname: Ambali
authors.forename: K A N
authors.initials: KA
authors.lastname: Esievo
mesh_terms: D046975:Clostridium chauvoei / Q000201:enzymology*; D029765:Combretum; D004789:Enzyme Activation / Q000187:drug effects; D000432:Methanol / Q000737:chemistry; D009439:Neuraminidase / Q000037:antagonists & inhibitors* / Q000302:isolation & purification / Q000378:metabolism; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018547:Plant Stems / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D013379:Substrate Specificity; D029861:Tamarindus
chemical_list: D010936:Plant Extracts; D009439:Neuraminidase; D000432:Methanol