科研之友
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摘要
Background: Alpha amylase hydrolyzes alpha-bonds of polysaccharides such as starch and produces maltooligosaccharides. Its starch saccharification applications make it an essential enzyme in the textile, food and brewing industries. Commercially available a-amylase is mostly produced from Bacillus or Aspergillus. A hyper-thermostable and Ca (2++) independent a-amylase from Pyrococcus furiosus (PFA) expressed in E. coli forms insoluble inclusion bodies and thus is not feasible for industrial applications. Results: We expressed PFA in Nicotiana tabacum and found that plant-produced PFA forms functional aggregates with an accumulation level up to 3.4 g/kg FW (fresh weight) in field conditions. The aggregates are functional without requiring refolding and therefore have potential to be applied as homogenized plant tissue without extraction or purification. PFA can also be extracted from plant tissue upon dissolution in a mild reducing buffer containing SDS. Like the enzyme produced in P. furiosus and in E. coli, plant produced PFA preserves hyper-thermophilicity and hyper-thermostability and has a long shelf life when stored in lyophilized leaf tissue. With tobacco's large biomass and high yield, hyper-thermostable alpha-amylase was produced at a scale of 42 kg per hectare. Conclusions: Tobacco may be a suitable bioreactor for industrial production of active hyper-thermostable alpha amylase.
- 出版日期2017-6-19
