Lipase gene from Penicillium expansum(lip07) was cloned and over-expressed in Pichia pastoris.a random mutant named ep8,which contained a single amino acid substitution,was obtained by using the lip07 as an error-prone PCR template in previous study.ep8 shows higher thermostability than that of lip07,To further improve the thermostability of the lipase,the Lys of wild-type(lip07) and mutant(ep8) in 202 were substituted by Ala using the Overlap extension PCR technique respectively.The mutant genes(lip07-K202...
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