Displaying Lipase B from Candida antarctica in Pichia pastoris Using the Yeast Surface Display Approach: Prospection of a New Anchor and Characterization of the Whole Cell Biocatalyst

PLoS One. 2015 Oct 28;10(10):e0141454. doi: 10.1371/journal.pone.0141454. eCollection 2015.

Abstract

Yeast Surface Display (YSD) is a strategy to anchor proteins on the yeast cell wall which has been employed to increase enzyme stability thus decreasing production costs. Lipase B from Candida antarctica (LipB) is one of the most studied enzymes in the context of industrial biotechnology. This study aimed to assess the biochemical features of this important biocatalyst when immobilized on the cell surface of the methylotrophic yeast Pichia pastoris using the YSD approach. For that purpose, two anchors were tested. The first (Flo9) was identified after a prospection of the P. pastoris genome being related to the family of flocculins similar to Flo1 but significantly smaller. The second is the Protein with Internal Repeats (Pir1) from P. pastoris. An immunolocalization assay showed that both anchor proteins were able to display the reporter protein EGFP in the yeast outer cell wall. LipB was expressed in P. pastoris fused either to Flo9 (FLOLIPB) or Pir1 (PIRLIPB). Both constructions showed hydrolytic activity towards tributyrin (>100 U/mgdcw and >80 U/mgdcw, respectively), optimal hydrolytic activity around 45°C and pH 7.0, higher thermostability at 45°C and stability in organic solvents when compared to a free lipase.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Candida / enzymology
  • Candida / genetics*
  • Catalysis
  • Cell Surface Display Techniques*
  • Computational Biology / methods
  • Enzyme Stability
  • Gene Expression
  • Genes, Reporter
  • Hydrogen-Ion Concentration
  • Lipase / genetics*
  • Lipase / metabolism
  • Pichia / genetics*
  • Pichia / metabolism
  • Temperature
  • Two-Hybrid System Techniques*

Substances

  • Lipase

Grants and funding

The authors would like to thank CNPq, FAPERJ, CAPES and PETROBRAS for the financial and structural support given to the present work. Marcelo Victor Holanda Moura and Giulia Pontes da Silva were supported by CNPq. Antônio Carlos de Oliveira Machado was supported by Petrobras. The laboratories of Prof Fernando Araripe, Denise Freire and Rodrigo Almeida are supported by CNPq, CAPES, FAPERJ and Petrobras.