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Indian J Biochem Biophys ; 2012 Apr; 49(2): 109-114
Artículo en Inglés | IMSEAR | ID: sea-140226

RESUMEN

Invertase was purified from rose (Fructus cynosbati) hips by ammonium sulfate fractionation and hydroxyapatite column chromatography. The enzyme was obtained with a yield of 4.25% and about 10.48-fold purification and had a specific activity of 8.59 U/mg protein. The molecular mass of invertase was estimated to be 66.51 kDa by PAGE and 34 kDa by SDS-PAGE, indicating that the native enzyme was a homodimer. The enzyme was a glycoprotein and contained 5.86% carbohydrate. The Km for sucrose was 14.55 mM and the optimum pH and temperature of the enzyme were 4.5 and 40°C, respectively. Sucrose was the most preferred substrate of the enzyme. The enzyme also hydrolyzed D(+) raffinose, D(+) trehalose and inulin (activity 39.88, 8.12 and 4.94%, respectively of that of sucrose), while D(+) lactose, cellobiose and D(+) maltose showed no effect on the enzyme. The substrate specificity was consistent with that for a β-fructofuranoside, which is the most popular type in the higher plants. The enzyme was completely inhibited by HgCl2, MnCl2, MnSO4, FeCl3, Pb(NO3)2, ammonium heptamolybdate, iodoacetamide and pyridoxine hydrochloride. It was also inhibited by Ba(NO3)2 (86.32%), NH4Cl (84.91%), MgCl2 (74.45%), urea (71.63%), I2 (69.64%), LiCl (64.99%), BaCl2 (50.30%), Mg(NO3)2 (49.90%), CrCl3 (31.90%) and CuSO4 (21.45%) and but was activated by Tris (73.99%) and methionine (12.47%).


Asunto(s)
Metabolismo de los Hidratos de Carbono , Fraccionamiento Químico/métodos , Activación Enzimática/efectos de los fármacos , Inhibidores Enzimáticos/farmacología , Frutas/enzimología , Concentración de Iones de Hidrógeno , Peso Molecular , Rosa/enzimología , Especificidad por Sustrato , Temperatura , beta-Fructofuranosidasa/antagonistas & inhibidores , beta-Fructofuranosidasa/química , beta-Fructofuranosidasa/aislamiento & purificación , beta-Fructofuranosidasa/metabolismo
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