Characterization and potential applications of a recombinant antifreeze protein from an antarctic yeast Glaciozyma antarctica produced in Pichia pastoris
Ice recrystallization during thawing post-cryopreservation results in extensive cellular damage and ultimately leads to cell death and reduced cell viability. Antifreeze proteins (AFPs) are a group of proteins that allow organisms to survive in subzero environments. These proteins have thermal hys...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit Universiti Kebangsaan Malaysia
2017
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| Online Access: | http://journalarticle.ukm.my/12323/ http://journalarticle.ukm.my/12323/ http://journalarticle.ukm.my/12323/1/46_01_30.pdf |
| Summary: | Ice recrystallization during thawing post-cryopreservation results in extensive cellular damage and ultimately leads to cell
death and reduced cell viability. Antifreeze proteins (AFPs) are a group of proteins that allow organisms to survive in subzero
environments. These proteins have thermal hysteresis and ice recrystallization inhibitory activities. In this present study,
we demonstrated the efficiency of a recombinant antifreeze protein from the Antarctic yeast, Glaciozyma antarctica, as a
recrystallization inhibitor (RI) of ice growth and assessed its application as a cryopreservative of the fungal cutinase enzyme
against freeze-thaw cycles. Recombinant Afp1 from G. antarctica, a psychrophilic yeast, has been produced in a methylotrophic
yeast, Pichia pastoris, system that results in the expression of a hyper-glycoprotein (~55 kDa). Recombinant Afp1 exhibits
antifreeze functions: thermal hysteresis (TH) and recrystallization inhibition where the highest TH values recorded for ~0.5°C
at 10 mg/mL. The cryoprotective effects of Afp1 on purified recombinant cutinase showed that Afp1 can retain enzymatic
activity up to ~20% when subjected to several cycles of freeze thawing. These findings indicate that Afp1 might act as a
cryoprotective agent and thus, has great potential in biotechnology applications. |
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