Publication detail

Evaluation of Recombinant Kpkt Cytotoxicity on HaCaT Cells: Further Steps towards the Biotechnological Exploitation Yeast Killer Toxins

CARBONI, G. MÁROVÁ, I.

Original Title

Evaluation of Recombinant Kpkt Cytotoxicity on HaCaT Cells: Further Steps towards the Biotechnological Exploitation Yeast Killer Toxins

Type

journal article in Web of Science

Language

English

Original Abstract

The soil yeast Tetrapisispora phaffii secretes a killer toxin, named Kpkt, that shows beta-glucanase activity and is lethal to wine spoilage yeasts belonging to Kloeckera/Hanseniaspora, Saccharomycodes and Zygosaccharomyces. When expressed in Komagataella phaffii, recombinant Kpkt displays a wider spectrum of action as compared to its native counterpart, being active on a vast array of wine yeasts and food-related bacteria. Here, to gather information on recombinant Kpkt cytotoxicity, lyophilized preparations of this toxin (LrKpkt) were obtained and tested on immortalized human keratinocyte HaCaT cells, a model for the stratified squamous epithelium of the oral cavity and esophagus. LrKpkt proved harmless to HaCaT cells at concentrations up to 36 AU/mL, which are largely above those required to kill food-related yeasts and bacteria in vitro (0.25-2 AU/mL). At higher concentrations, it showed a dose dependent effect that was comparable to that of the negative control and therefore could be ascribed to compounds, other than the toxin, occurring in the lyophilized preparations. Considering the dearth of studies regarding the effects of yeast killer toxins on human cell lines, these results represent a first mandatory step towards the evaluation the possible risks associated to human intake. Moreover, in accordance with that observed on Ceratitis capitata and Musca domestica, they support the lack of toxicity of this toxin on non-target eukaryotic models and corroborate the possible exploitation of killer toxins as natural antimicrobials in the food and beverages industries.

Keywords

Kpkt; yeast killer toxin; natural antimicrobial; HaCaT cells

Authors

CARBONI, G.; MÁROVÁ, I.

Released

2. 3. 2021

Publisher

MDPI

Location

BASEL

ISBN

2304-8158

Periodical

Foods

Year of study

10

Number

3

State

Swiss Confederation

Pages from

1

Pages to

11

Pages count

11

URL

http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=E3t3PwZwXLt1SuGZEat&page=1&doc=2

BibTex

@article{BUT171710,
  author="Gavino {Carboni} and Ivana {Márová}",
  title="Evaluation of Recombinant Kpkt Cytotoxicity on HaCaT Cells: Further Steps towards the Biotechnological Exploitation Yeast Killer Toxins",
  journal="Foods",
  year="2021",
  volume="10",
  number="3",
  pages="1--11",
  doi="10.3390/foods10030556",
  issn="2304-8158",
  url="http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=E3t3PwZwXLt1SuGZEat&page=1&doc=2"
}