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Phosphorolytic cleavage of sucrose by sucrose-grown ruminal bacterium Pseudobutyrivibrio ruminis strain k3

K. Stan-Glasek, A. Kasperowicz, W. Guczyńska, M. Piknová, P. Pristaš, K. Nigutová, P. Javorský, T. Michałowski

. 2010 ; 55 (4) : 383-385.

Jazyk angličtina Země Česko

Perzistentní odkaz   https://www.medvik.cz/link/bmc10025509

Rumen bacterium Pseudobutyrivibrio ruminis strain k3 utilized over 90% sucrose added to the growth medium as a sole carbon source. Zymographic studies of the bacterial cell extract revealed the presence of a single enzyme involved in sucrose digestion. Thin layer chromatography showed fructose and glucose-1-phosphate (Glc1P) as end products of the digestion of sucrose by identified enzyme. The activity of the enzyme depended on the presence of inorganic phosphate and was the highest at the concentration of phosphate 56 mmol/L. The enzyme was identified as the sucrose phosphorylase (EC 2.4.1.7) of molar mass approximately 54 kDa and maximum activity at pH 6.0 and 45 degrees C. The calculated Michaelis constant (Km) for Glc1P formation and release of fructose by partially purified enzyme were 4.4 and 8.56 mmol/L while the maximum velocities of the reaction (Vlim) were 1.19 and 0.64 micromol/L per mg protein per min, respectively.

6th International Symposium of Anaerobic Microbiology (ISAM 2009) held in Liblice (Czech Republic), 18 - 20 June 2009

Bibliografie atd.

Lit.: 16

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