pKLAC1-malE Control Plasmid

  • This product was discontinued on January 01, 2013

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  • Discontinued
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    pKLAC1-malE is a control plasmid for the K. lactis Expression Kit (NEB #E1000). The backbone integrative expression vector, pKLAC1, directs high-level expression of recombinant protein from the yeast Kluyveromyces lactis. Vector pKLAC1-malE carries the E. coli malE gene, encoding the maltose binding protein (MBP). pKLAC1-malE can be used to test plasmid transformation, cell culture, and protein production procedures. A typical K. lactis GG799 strain containing integrated pKLAC1-malE will produce > 25 mg/L of MBP (Figure 1).

    Figure 1: SDS-polyacrylamide gel electrophoresis of secreted recombinant maltose binding protein (MBP). (A) Detection of secreted MBP by Coomassie staining. Lane 1: Protein Molecular Weight Markers. Lane 2: spent culture medium (15 µl) from wild-type K. lactis cells. Lane 3: spent culture medium (15 µl) from K. lactis cells harboring integrated pKLAC1-malE.(B) Detection of secreted MBP by Western analysis using a polyclonal anti-MBP antibody (NEB #E8031S; 1:2000 dilution) and an anti-rabbit IgG-HRP secondary antibody (1:2000 dilution). Lane 1: culture medium from K. lactis cells (15 µl). Lane 2: culture medium (15 µl) from K. lactis cells containing integrated pKLAC1-malE.


    • Expression of the fusion gene is under the control of the strong K. lactis PLAC4-PBI promoter
    • K. lactis strain GG799 can be used as an expression host
    • Ampicillin resistance for propagation in E. coli (See notes for strain recommendations.)
    • Fungal acetamidase selectable marker for integration into the K. lactis genome
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