Diosgenin is an important raw material of numerous synthetic steroidal drugs, such as sex hormones, contraceptives, and cortisone. Diosgenin production with enzymatic catalysis provides a solution for avoiding severe environmental...
Metal–organic
frameworks (MOFs), as a kind of poriferous
nanoparticle, are promising candidates for enzyme immobilization to
enhance their stability and reusability. However, most MOFs could
not specifically immobilize enzymes and regenerate easily, which inevitably
leads to serious high consumption and environmental pollution. In
this study, renewable and magnetic MOFs were first constructed to
specially immobilize His-tagged enzymes from the cell lysates without
purification. The immobilized β-glucuronidase exhibited wider
pH adaptability and temperature stability. The relative activity of
immobilized β-glucuronidase was still maintained at ∼80%
after eight cycles. Importantly, after simple treatment, the immobilization
capacity of regenerated MOFs after simple treatment was restored to
more than 90% in the first three times. The specific magnetic MOFs
were proven to be an efficient and renewable platform for one-step
immobilization and purification of His-tagged enzymes, showing great
potential in industrial applications of nanotechnology and biocatalysis.
Icaritin is a rare and high-value isopentane flavonoid
compound
with remarkable activities. Increasing yields while reducing cost
has been a great challenge in icaritin production. Herein, we first
reported a high titer icaritin biosynthesis strategy from epimedin
C through co-immobilizing α-l-rhamnosidase (Rha1) and
β-glucosidase (Glu4) using cross-linked enzyme aggregates (CLEAs).
The created CLEAs exhibited excellent performances in terms of catalytic
activity, thermal stability, pH stability, and reusability. Notably,
Rha1-CLEAs (K
i
: 1 M)
and Glu4-CLEAs (K
i
: 0.1
M) were more tolerant to sugars (glucose or rhamnose) than free enzymes
(0.1 M for Rha1 and 0.007 M for Glu4) by immobilization, achieving
the highest icaritin productivity under the highest substrate concentration
ever reported. Finally, about 34.24 g/L icaritin could be obtained
from 100 g/L epimedin C within 8 h, indicating the great potential
for industrialization. This study also provides a promising strategy
for the low-cost production of other high-value aglycone compounds
by solving poor stability and sugar inhibition of glycosidase.
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