Pectinase secreted by psychrotolerant fungi: identification, molecular characterization and heterologous expression of a cold-active polygalacturonase from Tetracladium sp. View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Mario Carrasco, Juan Manuel Rozas, Jennifer Alcaíno, Víctor Cifuentes, Marcelo Baeza

ABSTRACT

BACKGROUND: Pectinolytic enzymes, which are used in several industries, especially in the clarification process during wine and fruit juice production, represent approximately 10% of the global enzyme market. To prevent the proliferation of undesired microorganisms, to retain labile and volatile flavor compounds, and to save energy, the current trend is to perform this process at low temperatures. However, the commercially available pectinases are highly active at temperatures approximately 50 °C and poorly active at temperatures below 35 °C, which is the reason why there is a constant search for cold-active pectinases. In preliminary studies, pectinolytic activity was detected in cold-adapted yeasts and yeast-like microorganisms isolated from Antarctica. The aim of the present work was to characterize pectinases secreted by these microorganisms and to express the best candidate in Pichia pastoris. RESULTS: Degradation of pectin by extracellular protein extracellular extracts obtained from 12 yeast cultures were assayed in plates at 4 °C to 37 °C and pH from 5.4 to 7.0, obtaining positive results in samples obtained from Dioszegia sp., Phenoliferia glacialis and Tetracladium sp. An enzyme was purified from Tetracladium sp., analyzed by peptide mass fingerprinting and compared to genome and transcriptome data from the same microorganism. Thus, the encoding gene was identified corresponding to a polygalacturonase-encoding gene. The enzyme was expressed in Pichia pastoris, and the recombinant polygalacturonase displayed higher activity at 15 °C than a mesophilic counterpart. CONCLUSIONS: Extracellular pectinase activity was found in three yeast and yeast-like microorganisms from which the highest activity was displayed by Tetracladium sp., and the enzyme was identified as a polygalacturonase. The recombinant polygalacturonase produced in P. pastoris showed high activity at 15 °C, representing an attractive candidate to be applied in clarification processes in the production of fermented beverages and fruit juices. More... »

PAGES

45

Journal

TITLE

Microbial Cell Factories

ISSUE

1

VOLUME

18

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12934-019-1092-2

DOI

http://dx.doi.org/10.1186/s12934-019-1092-2

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112606610

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30845994


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