Purification and characterization of a novel cold adapted fungal glucoamylase
Background: Amylases are used in various industrial processes and a key requirement for the efficiency of these processes is the use of enzymes with high catalytic activity at ambient temperature. Unfortunately, most amylases isolated from bacteria and filamentous fungi have optimal activity above 4...
Published in: | Microbial Cell Factories |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
BioMed Central
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1186/s12934-017-0693-x https://repositorio.uchile.cl/handle/2250/168936 |
id |
ftunivchile:oai:repositorio.uchile.cl:2250/168936 |
---|---|
record_format |
openpolar |
spelling |
ftunivchile:oai:repositorio.uchile.cl:2250/168936 2023-05-15T13:59:14+02:00 Purification and characterization of a novel cold adapted fungal glucoamylase Carrasco, Mario Alcaíno Gorman, Jennifer Cifuentes Guzmán, Víctor Baeza Cancino, Marcelo 2017 application/pdf https://doi.org/10.1186/s12934-017-0693-x https://repositorio.uchile.cl/handle/2250/168936 en eng BioMed Central Microbial Cell Factories, Volumen 16, Issue 1, 2017 14752859 doi:10.1186/s12934-017-0693-x https://repositorio.uchile.cl/handle/2250/168936 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Microbial Cell Factories Antarctic fungi Cold-adapted amylase Fungal amylase Tetracladium sp Artículo de revista 2017 ftunivchile https://doi.org/10.1186/s12934-017-0693-x 2023-01-22T00:58:38Z Background: Amylases are used in various industrial processes and a key requirement for the efficiency of these processes is the use of enzymes with high catalytic activity at ambient temperature. Unfortunately, most amylases isolated from bacteria and filamentous fungi have optimal activity above 45 °C and low pH. For example, the most commonly used industrial glucoamylases, a type of amylase that degrades starch to glucose, are produced by Aspergillus strains displaying optimal activities at 45–60 °C. Thus, isolating new amylases with optimal activity at ambient temperature is essential for improving industrial processes. In this report, a glucoamylase secreted by the cold-adapted yeast Tetracladium sp. was isolated and biochemically characterized. Results: The effects of physicochemical parameters on enzyme activity were analyzed, and pH and temperature were found to be key factors modulating the glucoamylase activity. The optimal conditions for enzyme activity were 30 °C and pH 6.0, and the Km and kcat using soluble starch as substrate were 4.5 g/L and 45 min−1, respectively. Possible amylase or glucoamylase encoding genes were identified, and their transcript levels using glucose or soluble starch as the sole carbon source were analyzed. Transcription levels were highest in medium supplemented with soluble starch for the potential glucoamylase encoding gene. Comparison of the structural model of the identified Tetracladium sp. glucoamylase with the solved structure of the Hypocrea jecorina glucoamylase revealed unique structural features that may explain the thermal lability of the glucoamylase from Tetracladium sp. Article in Journal/Newspaper Antarc* Antarctic Universidad de Chile: Repositorio académico Antarctic Microbial Cell Factories 16 1 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Antarctic fungi Cold-adapted amylase Fungal amylase Tetracladium sp |
spellingShingle |
Antarctic fungi Cold-adapted amylase Fungal amylase Tetracladium sp Carrasco, Mario Alcaíno Gorman, Jennifer Cifuentes Guzmán, Víctor Baeza Cancino, Marcelo Purification and characterization of a novel cold adapted fungal glucoamylase |
topic_facet |
Antarctic fungi Cold-adapted amylase Fungal amylase Tetracladium sp |
description |
Background: Amylases are used in various industrial processes and a key requirement for the efficiency of these processes is the use of enzymes with high catalytic activity at ambient temperature. Unfortunately, most amylases isolated from bacteria and filamentous fungi have optimal activity above 45 °C and low pH. For example, the most commonly used industrial glucoamylases, a type of amylase that degrades starch to glucose, are produced by Aspergillus strains displaying optimal activities at 45–60 °C. Thus, isolating new amylases with optimal activity at ambient temperature is essential for improving industrial processes. In this report, a glucoamylase secreted by the cold-adapted yeast Tetracladium sp. was isolated and biochemically characterized. Results: The effects of physicochemical parameters on enzyme activity were analyzed, and pH and temperature were found to be key factors modulating the glucoamylase activity. The optimal conditions for enzyme activity were 30 °C and pH 6.0, and the Km and kcat using soluble starch as substrate were 4.5 g/L and 45 min−1, respectively. Possible amylase or glucoamylase encoding genes were identified, and their transcript levels using glucose or soluble starch as the sole carbon source were analyzed. Transcription levels were highest in medium supplemented with soluble starch for the potential glucoamylase encoding gene. Comparison of the structural model of the identified Tetracladium sp. glucoamylase with the solved structure of the Hypocrea jecorina glucoamylase revealed unique structural features that may explain the thermal lability of the glucoamylase from Tetracladium sp. |
format |
Article in Journal/Newspaper |
author |
Carrasco, Mario Alcaíno Gorman, Jennifer Cifuentes Guzmán, Víctor Baeza Cancino, Marcelo |
author_facet |
Carrasco, Mario Alcaíno Gorman, Jennifer Cifuentes Guzmán, Víctor Baeza Cancino, Marcelo |
author_sort |
Carrasco, Mario |
title |
Purification and characterization of a novel cold adapted fungal glucoamylase |
title_short |
Purification and characterization of a novel cold adapted fungal glucoamylase |
title_full |
Purification and characterization of a novel cold adapted fungal glucoamylase |
title_fullStr |
Purification and characterization of a novel cold adapted fungal glucoamylase |
title_full_unstemmed |
Purification and characterization of a novel cold adapted fungal glucoamylase |
title_sort |
purification and characterization of a novel cold adapted fungal glucoamylase |
publisher |
BioMed Central |
publishDate |
2017 |
url |
https://doi.org/10.1186/s12934-017-0693-x https://repositorio.uchile.cl/handle/2250/168936 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Microbial Cell Factories |
op_relation |
Microbial Cell Factories, Volumen 16, Issue 1, 2017 14752859 doi:10.1186/s12934-017-0693-x https://repositorio.uchile.cl/handle/2250/168936 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1186/s12934-017-0693-x |
container_title |
Microbial Cell Factories |
container_volume |
16 |
container_issue |
1 |
_version_ |
1766267747789963264 |