Abstract:
Kluyveromyces lactis is an established host for the secretory production of heterologous proteins. The
secretion of enhanced green fluorescent protein (EGFP) in K. lactis mediated by nine secretion signals
originating from different filamentous fungi – Aspergillus niger, Aspergillus nidulans, Aspergillus terreus,
Aspergillus awamori and Trichoderma reesei were investigated. EGFP was fused to the carboxyl terminus
of signals and was expressed under the control of the lac4 promoter. In all the cases, EGFP was secreted
into the extracellular fluid. SDS-polyacrylamide gel electrophoresis, western blot analysis of the culture
supernatant, and fluorescence measurements confirmed the efficient secretion of EGFP mediated by
the novel secretion sequences. In addition, we confirmed that codon optimization and addition of kex2
protease cleavage site in filamentous fungal signal peptide elevated the expression level of recombinant
proteins. Efficiency of fungal signal peptide in secretion of other heterologous proteins was demonstrated
through secretion of recombinant human interferon .
