当前位置： SCI文献检索 > APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY期刊下所有文献 > Molecular Cloning and Characterization of a Novel Cold-Adapted Alkaline 1,3-α-3,6-Anhydro-L-galactosidase, Ahg558, from Gayadomonas joobiniege G7.

Molecular Cloning and Characterization of a Novel Cold-Adapted Alkaline 1,3-α-3,6-Anhydro-L-galactosidase, Ahg558, from Gayadomonas joobiniege G7.

Abstract：

:Agar, a major polysaccharide of red algal cells, is degraded by β-agarases into neoagarobiose, which is further hydrolyzed into the monomers, D-galactose and 3,6-anhydro-L-galactose, by 1,3-α-3,6-anhydro-L-galactosidases including α-1,3-L-neoagarooligasaccharide hydrolase (α-NAOSH). A novel cold-adapted alkaline α-NAOSH, Ahg558, consisting of 359 amino acids (40.8 kDa) was identified from Gayadomonas joobiniege G7. It was annotated as a glycosyl hydrolase family 43 based on genomic sequence analysis, showing 84% and 74% identities with the characterized α-NAOSHs from Agarivorans gilvus WH0801 and Saccharophagus degradans 2-40, respectively. The recombinant Ahg558 (rAhg558) purified from Escherichia coli formed dimers and cleaved α-1,3 glycosidic bonds at the non-reducing ends of the neoagarobiose, neoagarotetraose, and neoagarohexaose, which was confirmed by thin-layer chromatography and mass spectrometry. The optimum pH and temperature for rAhg558 activity were 9.0 and 30 °C, respectively. Unusually, it retained over 93% activity in a broad range of temperatures between 0 and 40 °C and over 73% in a broad range of pH between pH 6.0 and pH 9.0, indicating it is a unique cold-adapted alkaline exo-acting α-NAOSH. Its enzymatic activity was dependent on Mn2+ ions. Km and Vmax values toward neoagarobiose were 2.6 mg/mL (8.01 mM) and 133.33 U/mg, respectively.

journal_name

Appl Biochem Biotechnol

journal_title

Applied biochemistry and biotechnology

authors

Asghar S,Lee CR,Chi WJ,Kang DK,Hong SK

doi

10.1007/s12010-019-02963-w

subject

Has Abstract

pub_date

2019-08-01 00:00:00

pages

1077-1095

issue

4

eissn

0273-2289

issn

1559-0291

pii

10.1007/s12010-019-02963-w

journal_volume

188

pub_type

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