Abstract
AgWH50A, a novel β-agarase, was cloned from Agarivorans gilvus WH0801 by degenerate and nested PCR. It consists of 942 amino acids (105kDa), including a 21-amino acid signal peptide. AgWH50A shares the highest amino acid sequence homology with AgaD02 from Agarivorans sp. QM38 (53%). The recombinant agarase gene was expressed in Escherichia coli and purified by affinity chromatography. Maximum enzymatic activity (Km 5.97mg/mL and Vmax 0.781U/mg) was observed at pH 6.0 and 30°C. Using matrix-assisted laser desorption/ionisation-time-of-flight mass spectrometry, Fourier transform-nuclear magnetic resonance spectrometry and thin-layer chromatography, we analysed the hydrolysis products and concluded that AgWH50A is a neoagarotetraose-forming β-agarase, which can cleave agarose into neoagarotetraose. This novel agarase has potential applications in the industrial production of neoagarotetraose and provides a new agarose hydrolysis model for future research.
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