Construction and characterization of centromeric plasmids for Komagataella phaffii using a color-based plasmid stability assay.

Autor: Piva LC; Departamento de Biologia Celular, Bloco K, primeiro andar, Universidade de Brasília, Brasília, Brazil., De Marco JL; Departamento de Biologia Celular, Bloco K, primeiro andar, Universidade de Brasília, Brasília, Brazil., Moraes LMP; Departamento de Biologia Celular, Bloco K, primeiro andar, Universidade de Brasília, Brasília, Brazil., Reis VCB; Departamento de Biologia Celular, Bloco K, primeiro andar, Universidade de Brasília, Brasília, Brazil., Torres FAG; Departamento de Biologia Celular, Bloco K, primeiro andar, Universidade de Brasília, Brasília, Brazil.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2020 Jul 02; Vol. 15 (7), pp. e0235532. Date of Electronic Publication: 2020 Jul 02 (Print Publication: 2020).
DOI: 10.1371/journal.pone.0235532
Abstrakt: The yeast Komagataella phaffii is widely used as a microbial host for heterologous protein production. However, molecular tools for this yeast are basically restricted to a few integrative and replicative plasmids. Four sequences that have recently been proposed as the K. phaffii centromeres could be used to develop a new class of mitotically stable vectors. In this work, we designed a color-based genetic assay to investigate plasmid stability in K. phaffii and constructed vectors bearing K. phaffii centromeres and the ADE3 marker. These genetic tools were evaluated in terms of mitotic stability by transforming an ade2/ade3 auxotrophic strain and regarding plasmid copy number by quantitative PCR (qPCR). Our results confirmed that the centromeric plasmids were maintained at low copy numbers as a result of typical chromosome-like segregation during cell division. These features, combined with in vivo assembly possibilities, prompt these plasmids as a new addition to the K. phaffii genetic toolbox.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
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