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Study on Properties of PG Separated and Purified From Actinidia Arguta

机译:PG分离和纯化猕猴属纯化的性质研究

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Polygalacturonase (PG) is key enzyme for softening consenescence mechanism of fruits. In this work, Properties of PG separated and purified from wild Actinidia Arguta were studied. The result shows that the optimal reaction temperature is 40°C with a high enzyme activity around 30-50°C. PG keeps a thermo stability at the temperature ranging from 30-40°C, which decreases with increasing of temperature and PG will lose all its activity under 60-70°C for 1h. The optimal reaction pH value for this enzyme is 5.5. As far as the stability in different pH values is concerned, PG is relatively stable for preservation at pH4.5-6.5. The michaelis constant for PG is 27.31. When the concentration for EDTA is higher than 2mmol/L, it is inhibitive for PG. The metal ions of K~+, Ca~(2+), Fe~(2+), Fe~(3+), Mg~(2+) can activate the PG enzyme to some extent, the strength of activation:Mg~(2+), Fe~(3+), K~+, Fe~(2+), Ca~(2+);The metal ions of Cu~(2+), Zn~(2+), Mn~(2+), Ba~(2+), Al~(3+) can inhibit PG enzyme to some extent, the strength of inhibition:Al~(3+), Ba~(2+), Mn~(2+), Cu~(2+), Zn~(2+).
机译:polyGalacturonase(pg)是用于软化果实的疗效机理的关键酶。在这项工作中,研究了PG分离和纯化的PG的性质。结果表明,最佳反应温度为40℃,高酶活性约为30-50℃。 PG在30-40°C的温度下保持热稳定性,随着温度的增加而降低,PG将失去60-70°C下的所有活性1小时。该酶的最佳反应pH值为5.5。就不同pH值的稳定性而言,PG在PH4.5-6.5处的保存相对稳定。 pg的michaelis常数是27.31。当EDTA的浓度高于2mmol / L时,PG抑制。 K〜+,Ca〜(2+),Fe〜(2+),Fe〜(3+),mg〜(2+)的金属离子可以在一定程度上激活活化强度:mg 〜(2+),Fe〜(3+),K〜+,Fe〜(2+),Ca〜(2 +); Cu〜(2+),Zn〜(2+),Mn的金属离子〜(2+),Ba〜(2+),Al〜(3+)可以在一定程度上抑制PG酶,抑制强度:Al〜(3+),Ba〜(2+),Mn〜(2 +),Cu〜(2+),Zn〜(2+)。

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