Activation volumes of enzymes adsorbed on silica particles.
Activation volumes of enzymes adsorbed on silica particles.
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吸附在二氧化硅颗粒上的酶的活化体积
DOI:
10.1021/la503605x
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
C. Czeslik
中科院分区:
文献类型:
--
作者:
V. Schuabb;C. Czeslik
The immobilization of enzymes on carrier particles is useful in many biotechnological processes. In this way, enzymes can be separated from the reaction solution by filtering and can be reused in several cycles. On the other hand, there is a series of examples of free enzymes in solution that can be activated by the application of pressure. Thus, a potential loss of enzymatic activity upon immobilization on carrier particles might be compensated by pressure. In this study, we have determined the activation volumes of two enzymes, α-chymotrypsin (α-CT) and horseradish peroxidase (HRP), when they are adsorbed on silica particles and free in solution. The experiments have been carried out using fluorescence assays under pressures up to 2000 bar. In all cases, activation volumes were found to depend on the applied pressure, suggesting different compressions of the enzyme-substrate complex and the transition state. The volume profiles of free and adsorbed HRP are similar. For α-CT, larger activation volumes are found in the adsorbed state. However, up to about 500 bar, the enzymatic reaction of α-CT, which is adsorbed on silica particles, is characterized by a negative activation volume. This observation suggests that application of pressure might indeed be useful to enhance the activity of enzymes on carrier particles.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
A. S. Malinin;A. A. Rakhnyanskaya;A. Bacheva;A. Yaroslavov
通讯作者:
A. Yaroslavov
影响因子:
2.9
作者:
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通讯作者:
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发表时间:
2008
期刊:
Biophysics
影响因子:
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K. Akasaka;H. Nagahata;A. Maeno;Ken Sasaki
通讯作者:
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DOI:
10.1016/0304-4165(89)90122-0
发表时间:
1989
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
G. Ojteg;P. Lundahl;M. Wolgast
通讯作者:
M. Wolgast
DOI:
--
发表时间:
1975
影响因子:
11.1
作者:
P. Low;G. Somero
通讯作者:
G. Somero