Enzymatic properties and the gene structure of a cold-adapted laminarinase from Pseudoalteromonas species LA.
J Biosci Bioeng
; 126(2): 169-175, 2018 Aug.
Article
em En
| MEDLINE
| ID: mdl-29627318
ABSTRACT
We isolated a laminarin-degrading cold-adapted bacterium strain LA from coastal seawater in Sagami Bay, Japan and identified it as a Pseudoalteromonas species. We named the extracellular laminarinase LA-Lam, and purified and characterized it. LA-Lam showed high degradation activity for Laminaria digitata laminarin in the ranges of 15-50°C and pH 5.0-9.0. The major terminal products degraded from L. digitata laminarin with LA-Lam were glucose, laminaribiose, and laminaritriose. The degradation profile of laminarioligosaccharides with LA-Lam suggested that the enzyme has a high substrate binding ability toward tetrameric or larger saccharides. Our results of the gene sequence and the SDS-PAGE analyses revealed that the major part of mature LA-Lam is a catalytic domain that belongs to the GH16 family, although its precursor is composed of a signal peptide, the catalytic domain, and three-repeated unknown regions.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Adaptação Biológica
/
Temperatura Baixa
/
Pseudoalteromonas
/
Celulases
Idioma:
En
Revista:
J Biosci Bioeng
Assunto da revista:
ENGENHARIA BIOMEDICA
/
MICROBIOLOGIA
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Japão