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Phenylalanine to leucine point mutation in oxyanion hole improved catalytic efficiency of Lip12 from Yarrowia lipolytica

Paper ID Volume ID Publish Year Pages File Format Full-Text
17068 42638 2013 5 PDF Available
Title
Phenylalanine to leucine point mutation in oxyanion hole improved catalytic efficiency of Lip12 from Yarrowia lipolytica
Abstract

•F148L mutation of Lip12 from Y. lipotlytica lead to improved catalytic efficiency.•F148L mutant showed lowered activation energy compared to wild protein.•There was no change in substrate specificity after mutation.

In lipases, oxyanion hole has crucial role in the stabilisation of enzyme–substrate complex. Majority of lipases from Yarrowia lipolytica consist of two oxyanion hole residues viz.; Thr and Leu. However, Lip12 has Phe instead of Leu at second oxyanion hole residue. It was observed that Lip12 has lower specific activity and catalytic efficiency than other lipases of Yarrowia.In silico analysis of Phe to Leu mutation revealed improved binding energy of Lip12 for p-np palmitate. This was validated by Phe148 to Leu point mutation where, specific activity of mutant was 401 U/mg on olive oil, which was two fold higher in comparison to wild-type. Kcat, remained unaltered, while decrease in Km was predominant for all the substrates used in the study. Improved catalytic efficiency of mutant was a function of chain length in case of p-np esters, with 73% improvement for p-np stearate. However, hydrolysis of triacylglycerides improved by 20%, irrespective of chain length. Decrease in activation energy for all the substrates, was observed in mutant in comparison to wild-type, indicating better stabilisation of transition state complex. Further, unaltered differential activation energy for mutant depicts that substrate specificity of enzyme remained same after mutation.

Keywords
Yarrowia lipolytica; Lipase; Oxyanion hole; Catalytic efficiency; Differential activation energy
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Phenylalanine to leucine point mutation in oxyanion hole improved catalytic efficiency of Lip12 from Yarrowia lipolytica
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 53, Issues 6–7, 10 December 2013, Pages 386–390
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us