Samsudin, Nurhusna and Noorbatcha, Ibrahim Ali and Amid, Azura and Mohd. Salleh, Hamzah
(2010)
Improvement of phytase properties by rational design
intended for animal feed.
In: IIUM Research, Innovation & Invention Exhibition, (IRIIE 2010), 26 - 27 January 2010, IIUM.
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Abstract
For application in animal feed, a phytase of interest must have high activity in the broad range
prevalent industrial condition and in digestive tract of the animal. The present investigation describes
approaches to rationally engineer a phytase with better activity profiles. Computer modelling is used to
identify and examine active site of phyFAUIA1 phytase. The factors influencing the ligand binding
strength in the active site is analyzed and computational site directed mutagenesis experiments were
carried out to evaluate the effects of mutations on the binding strength before and after mutation. From
the directive results of computational studies, point mutation was introduced by site directed mutagenesis
using polymerase chain reaction (PCR). Mutagenesis is achieved by two steps PCR procedure. Four
primers were designed and synthesized: two primers contain mutation at the point of interest which is
complement to each other and the other two primers were designed for unique restriction sites. Several
numbers of single, double as well as triple mutations have been introduced in phyFAUIA1 gene, and the
mutant enzymes will be characterized and compared to computational results.
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