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  • Oral Presentation
  • Open Access

Expression efficiency and sequence-based factors: a comparative view on 79 human genes in Pichia pastoris

  • 1 and
  • 1, 2
Microbial Cell Factories20065 (Suppl 1) :S34

  • Published:


  • Recombinant Protein
  • Codon Usage
  • Heterologous Protein
  • Pichia Pastoris
  • Protein Yield

High yield expression of heterologous proteins is usually a matter of "trial and error". In the search of parameters with a major impact on expression, we have applied a comparative analysis to 79 homologous strains of Pichia pastoris harbouring different human cDNAs. Recombinant protein expression was monitored in a standardized procedure and classified with respect to the expression level. More than ten sequence-based parameters with a possible influence on the expression level were analysed. Three factors proved to have a statistically significant association with the expression level. Low abundance of AT-rich regions in the cDNA associates with a high expression level, indicating that correct transcript processing is a major determinant for the expression success in this yeast. A comparatively high isoelectric point of the recombinant protein associates with failure of expression and, finally, the occurrence of a protein homologue in yeast is associated with detectable protein expression. Interestingly, some often discussed factors like codon usage or GC content did not show a significant impact on protein yield.

These results could provide a basis for a knowledge-oriented optimisation of gene sequences both to increase protein yields and to help target selection and the design of high-throughput expression approaches.

Authors’ Affiliations

Department of Microbiology and Genetics, Technical University of Berlin, Institute of Biotechnology, Gustav-Meyer-Allee 25, Berlin, 13355, Germany
ORGANOBALANCE GmbH, Gustav-Meyer-Allee 25, Berlin, 13355, Germany


© Lang and Böttner; licensee BioMed Central Ltd. 2006

This article is published under license to BioMed Central Ltd.