Abstract
A new extracellular κ-carrageenase, namely CgkP, 34.0 kDa in molecular weight, was purified from Pseudoalteromonas sp. QY203. CgkP showed relatively high activity at acidities ranging from pH6.0 to pH9.0 and temperatures ranging from 30°C to 50°C with the highest activity at 45°C and pH7.2. Sodium chloride increased its activity markedly, and KCl increased its activity slightly. The divalent and trivalent metal ions including Cu2+, Ni2+, Zn2+, Mn2+, Al3+ and Fe3+ significantly inhibited its activity, while Mg2+ did not. CgkP remained 70% of original activity after being incubated at 40°C for 48 h, and remained 80% of the activity after being incubated at 45°C for 1 h. It exhibited endo-κ-carrageenase activity, mainly depolymerizing the κ-carrageenan into disaccharide and tetrasaccharide. CgkP was more thermostable than most of previously reported κ-carrageenases with a potential of being used in industry.
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Li, S., Jia, P., Wang, L. et al. Purification and characterization of a new thermostable κ-carrageenase from the marine bacterium Pseudoalteromonas sp. QY203. J. Ocean Univ. China 12, 155–159 (2013). https://doi.org/10.1007/s11802-013-1994-2
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DOI: https://doi.org/10.1007/s11802-013-1994-2