alexa The effect of carbon source on the secretome of Kluyveromyces lactis.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Clinical & Experimental Pharmacology

Author(s): Madinger CL, Sharma SS, Anton BP, Fields LG, Cushing ML,

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Abstract A proteomic analysis was performed on spent fermentation medium following bioreactor propagation of a wild-type industrial strain to identify proteins naturally secreted by Kluyveromyces lactis cells. Here, we report changes detected in the K. lactis secretome as a result of growth in three different carbon sources: glucose, galactose and glycerol. A total of 151 secreted proteins were detected by multi-dimensional separations and reversed-phase online nanoESI-MS/MS analysis. From these, we were able to identify 63 proteins (termed the "base secretome") that were common to all three fermentation conditions. The majority of base secretome proteins, 79\%, possessed general secretory pathway (GSP) sequences and were involved with cell wall structure, glycosylation, carbohydrate metabolism and proteolysis. There was little variation in the functional groupings of base secretome GSP proteins and GSP proteins that were not part of the base secretome. In contrast, the majority of non-GSP proteins detected were not part of the base secretome and the functions of these proteins varied significantly. Finally, through further identification of non-GSP proteins in carbon sources not originally tested, we have gained further evidence of a protein export mechanism separate from the GSP in K. lactis. This article was published in Proteomics and referenced in Journal of Clinical & Experimental Pharmacology

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