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KMID : 0545120100200071077
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Journal of Microbiology and Biotechnology
2010 Volume.20 No. 7 p.1077 ~ p.1085
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Biochemical and thermal stabilization parameters of polygalacturonase from Erwinia carotovora subsp. carotovora BR1
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Vimal B. Maisuria
Vilas A. Patel
Anuradha S. Nerurkar
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Abstract
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With emphasis on thermal behavior in presence of different pH conditions and salts, the kinetic and thermodynamic parameters of purified polygalacturonase (PG) of E. carotovora subsp. carotovora (Ecc) BR1 were studied since characterization of an enzyme is significant in the context of burgeoning biotechnological applications. Thermodynamic parameters for polygalacturonic acid hydrolysis by purified PG were, ΔH* = 7.98 kJ/mol, ΔG* = 68.86 kJ/mol, ΔS*= -194.48 J/mol/K, ΔGE-S = -1.04 kJ/mol and ΔGE-T = -8.96 kJ/mol. Its turnover number (kcat) was 21/sec. Purified PG was stable in 20-50°C temperature range and was deactivated at 60°C and 70°C. Thermodynamic parameters (ΔH*, ΔG*, ΔS*) for irreversible inactivation of PG at different temperatures (30-60°C) were determined, where effectiveness of various salts and different pH (4-8) individually for thermal stability of PG were characterized. The efficacy of various salts for thermal stability of PG was in the following order: MgCl2 >KCl >BaCl2 >CaCl2 >NaCl. Present work projects biochemical, thermodynamics of substrate hydrolysis as well as thermal stabilization parameters of PG from Ecc.
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KEYWORD
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Polygalacturonase, Erwinia carotovora, Thermodynamic, Kinetic, Thermalstabilization
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