Journal of Ocean University of China

, Volume 18, Issue 1, pp 185–192 | Cite as

Purification and Characterization of a Novel Hydrolase That Can Specifically Degrade the Polysaccharide Isolated from Green Seaweed Ulva prolifera

  • Jiaxin Li
  • Pei Zhang
  • Liang Hong
  • Chenguang LiuEmail author


The extracellular polysaccharide hydrolase-producing strain EP-1 was isolated from seawater and identified as Paenibacillus pabuli. Furthermore, a homogeneous extracellular polysaccharide hydrolase from Paenibacillus pabuli EP-1 was purified by combining ion-exchange chromatography and size exclusion chromatography with a purification fold of 90.69 and recovery of 16.23%. Characterization of the purified polysaccharide hydrolase revealed a molecular mass of 38 kDa and optimum activity at 45°C and pH 6.0. The polysaccharide hydrolase maintained its stability within a wide range of pH (3.0–12.0) and thermal stability when the temperature was below 50°C. The presence of Hg2+, Fe2+, Mn2+, Co2+ and SDS notably decreased hydrolase activity, and organic solvents such as formaldehyde, acetone, DMF and acetonitrile completely inhibited hydrolase activity. The purified hydrolase had no activity on agar, carrageenan, gellan gum, sodium alginate, or starch, but effectively hydrolyzed the polysaccharide from Ulva prolifera. The Km and Vmax values of this hydrolase were 43.84 mg mL−1 and 4.33 mg mL−1 min−1, respectively. The sequence analysis with quantitative time-of-flight mass spectrometry indicated that the hydrolase was an endoglucanase.

Key words

characterization hydrolase polysaccharide purification Ulva prolifera 


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This study was supported by the fund of Science and Technology Development Project of Shandong Province (No. 2015GGE29028).


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Copyright information

© Science Press, Ocean University of China and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jiaxin Li
    • 1
  • Pei Zhang
    • 1
  • Liang Hong
    • 1
  • Chenguang Liu
    • 1
    Email author
  1. 1.College of Marine Life SciencesOcean University of ChinaQingdaoChina

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