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A human cDNA expression library in yeast enriched for open reading frames.

C Holz1, A Lueking, L Bovekamp

  • 1Technical University Berlin, Institute for Biotechnology, D-13355 Berlin, Germany.

Genome Research
|October 10, 2001
PubMed
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We developed a novel yeast expression vector for high-throughput cDNA library screening. This method efficiently selects clones with open reading frames (ORFs), enriching for protein expression and streamlining recombinant protein discovery.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Recombinant Protein Expression

Background:

  • Traditional cDNA library screening is labor-intensive and inefficient.
  • Identifying clones with functional open reading frames (ORFs) is crucial for protein expression studies.
  • Existing methods for selecting functional clones are often time-consuming and costly.

Purpose of the Study:

  • To develop a high-throughput method for generating and screening cDNA libraries in yeast.
  • To create a yeast shuttle/expression vector for enriched selection of protein expression clones.
  • To facilitate the identification of cloned cDNA inserts containing functional open reading frames (ORFs).

Main Methods:

  • Construction of a novel yeast shuttle/expression vector, pYEXTSH3, utilizing the HIS3 marker gene.

Related Experiment Videos

  • Cloning of a human fetal brain cDNA library into the ORF vector.
  • Selection of histidine prototrophic yeast clones growing on minimal medium.
  • High-throughput arraying, sequencing, and protein expression analysis of selected clones.

    • Main Results:

    • The novel ORF vector enabled the selection of cDNA inserts in the correct reading frame.
    • Approximately 60% of clones in the constructed library contained inserts in the correct reading frame.
    • This represents a fourfold increase in the proportion of correctly framed inserts compared to unselected libraries (14% to 60%).
    • The method successfully enriched for protein expression clones, avoiding traditional antibody screening.

    Conclusions:

    • The developed system provides a one-step screening procedure for generating expression libraries.
    • It significantly enriches for clones with correct reading frames, serving as a source of recombinant proteins.
    • This approach offers a more efficient and cost-effective alternative to traditional methods for identifying protein-expressing clones.