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Purification, Characterization and Degradation Performance of a Novel Dextranase from Penicillium cyclopium CICC-4022

Lookup NU author(s): Professor David XieORCiD

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Abstract

A novel dextranase was purified from Penicillium cyclopium CICC-4022 by ammonium sulfate fractional precipitation and gel filtration chromatography. The effects of temperature, pH and some metal ions and chemicals on dextranase activity were investigated. Subsequently, the dextranase was used to produce dextran with specific molecular mass. Weight-average molecular mass (M_w) and the ratio of weight-average molecular mass/number-average molecular mass, or polydispersity index (M_w/M_n), of dextran were measured by multiple-angle laser light scattering (MALS) combined with gel permeation chromatography (GPC). The dextranase was purified to 16.09-fold concentration; the recovery rate was 29.17%; and the specific activity reached 350.29 U/mg. M_w of the dextranase was 66 kDa, which is similar to dextranase obtained from other Penicillium species reported previously. The highest activity was observed at 55 °C and a pH of 5.0. This dextranase was identified as an endodextranase, which specifically degraded the α-1,6 glucosidic bonds of dextran. According to metal ion dependency tests, Li⁺, Na⁺ and Fe²⁺ were observed to effectively improve the enzymatic activity. In particular, Li⁺ could improve the activity to 116.28%. Furthermore, the dextranase was efficient at degrading dextran and the degradation rate can be well controlled by the dextranase activity, substrate concentration and reaction time. Thus, our results demonstrate the high potential of this dextranase from Penicillium cyclopium CICC-4022 as an efficient enzyme to produce specific clinical dextrans.

Publication metadata

Author(s): Huang R, Zhong L, Xie F, Wei L, Gan L, Wang X, Liao A

Publication type: Article

Publication status: Published

Journal: International Journal of Molecular Sciences

Year: 2023

Volume: 20

Issue: 6

Online publication date: 18/03/2019

Acceptance date: 07/03/2019

Date deposited: 31/08/2023

ISSN (electronic): 1422-0067

Publisher: MDPI

URL: https://doi.org/10.3390/ijms20061360

DOI: 10.3390/ijms20061360

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