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α-Neoagarobiose (NAB)/neoagarooligosaccharide (NAO) hydrolase plays an important role as an exo-acting 3,6-anhydro-α-(1,3)-L-galactosidase in agarose utilization. Agarose is an abundant polysaccharide found in red seaweeds, comprising 3,6-anhydro-L-galactose (AHG) and D-galactose residues. Unlike agarose degradation, which has been reported in marine microbes, recent metagenomic analysis of Bacteroides plebeius , a human gut bacterium, revealed the presence of genes encoding enzymes involved in agarose degradation, including α-NAB/NAO hydrolase. Among the agarolytic enzymes, Bp GH117 has been partially characterized. Here, we characterized the exo-acting α-NAB/NAO hydrolase Bp GH117, originating from B. plebeius . The optimal temperature and pH for His-tagged Bp GH117 activity were 35 °C and 9.0, respectively, indicative of its unique origin. His-tagged Bp GH117 was thermostable up to 35 °C, and the enzyme activity was maintained at 80% of the initial activity at a pre-incubation temperature of 40 °C for 120 min. K m  and V max  values for NAB were 30.22 mM and 54.84 U/mg, respectively, and k cat /K m  was 2.65 s -1 mM -1 . These results suggest that His-tagged Bp GH117 can be used for producing bioactive products such as AHG and agarotriose from agarose efficiently.

Characterization of Neoagarooligosaccharide Hydrolase BpGH117 from a Human Gut Bacterium Bacteroides plebeius