ArticleJournal of bacteriology2014
Identification and characterization of an archaeal kojibiose catabolic pathway in the hyperthermophilic Pyrococcus sp. strain ST04.
Article in Journal of bacteriology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed, 14 citations in OpenAlex.
- The many functions of carbohydrate-active enzymes in family GH65: diversity and application.Applied microbiology and biotechnology · 2024Review
- Genetic and enzymatic characterization of Amy13E fromApplied and environmental microbiology · 2024Article
- Discovery of a Kojibiose Hydrolase by Analysis of Specificity-Determining Correlated Positions in Glycoside Hydrolase Family 65.Molecules (Basel, Switzerland) · 2021Article
- Transcription factor YcjW controls the emergency HNature communications · 2019Article
- Discovery of a Kojibiose Phosphorylase in Escherichia coli K-12.Biochemistry · 2018Article
- Broad substrate specificity of a hyperthermophilic α-glucosidase fromFood science and biotechnology · 2016Article
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Authors and funding
4 authors at 2 institutions in 2 countries.
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Abstract
A unique gene cluster responsible for kojibiose utilization was identified in the genome of Pyrococcus sp. strain ST04. The proteins it encodes hydrolyze kojibiose, a disaccharide product of glucose caramelization, and form glucose-6-phosphate (G6P) in two steps. Heterologous expression of the kojibiose-related enzymes in Escherichia coli revealed that two genes, Py04_1502 and Py04_1503, encode kojibiose phosphorylase (designated PsKP, for Pyrococcus sp. strain ST04 kojibiose phosphorylase) and β-phosphoglucomutase (PsPGM), respectively. Enzymatic assays show that PsKP hydrolyzes kojibiose to glucose and β-glucose-1-phosphate (β-G1P). The Km values for kojibiose and phosphate were determined to be 2.53 ± 0.21 mM and 1.34 ± 0.04 mM, respectively. PsPGM then converts β-G1P into G6P in the presence of 6 mM MgCl2. Conversion activity from β-G1P to G6P was 46.81 ± 3.66 U/mg, and reverse conversion activity from G6P to β-G1P was 3.51 ± 0.13 U/mg. The proteins are highly thermostable, with optimal temperatures of 90°C for PsKP and 95°C for PsPGM. These results indicate that Pyrococcus sp. strain ST04 converts kojibiose into G6P, a substrate of the glycolytic pathway. This is the first report of a disaccharide utilization pathway via phosphorolysis in hyperthermophilic archaea.
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