Abstract
We isolated a bacterial strain (HC4) that is able to degrade κ-carrageenan from a live specimen of the red alga Hyalosiphonia caespitosa. With 16S rRNA gene sequencing, we identified the strain as Tamlana sp., and then purified an extracellular κ-carrageenase from a culture of Tamlana sp. HC4 by ammonium sulfate precipitation, Sephadex G-200 gel filtration chromatography, and DE-cellulose 52 anion-exchange chromatography. The purified enzyme yields a single band on SDS-PAGE with a molecular mass of 66.4 kDa. The optimal pH and temperature for κ-carrageenase activity are at 8.0 and 30°C, respectively. The enzyme is stable over the range of pH 7.2–8.6 below 45°C. The enzyme activity is strongly inhibited by Zn2+ and Cu2+ at 1 mmol/L. The enzyme-catalyzed reaction follows Michaelis-Menten kinetics with the Michaelis constant (K m ) at 7.63 mg/ml. Analysis of the degradation products of the κ-carrageenase by ESI-MS and 13C-NMR spectroscopy indicates that the enzyme degrades κ-carrageenan down to the level of κ-neocarrabiose sulfate.
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Supported by the Open Project of Key Laboratory of Mariculture and Biotechnology, Ministry of Agriculture, Dalian Ocean University (No. K2006-12)
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Sun, F., Ma, Y., Wang, Y. et al. Purification and characterization of novel κ-carrageenase from marine Tamlana sp. HC4. Chin. J. Ocean. Limnol. 28, 1139–1145 (2010). https://doi.org/10.1007/s00343-010-9012-7
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DOI: https://doi.org/10.1007/s00343-010-9012-7