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ISSN 0864-4551 (Print)

2012, Number 1

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Biotecnol Apl 2012; 29 (1)

Stabilization of glucose oxidase with cyclodextrin-branched carboxymethylcellulose

Matos M, Simpson BK, Ramírez HL, Cao R, Torres-Labandeira JJ, Hernández K

Language: English
References: 34
Page:
PDF size: 230.13 Kb.


ABSTRACT

We present a methodology for improving some enzymatic characteristics of glucose oxidase (GOx) (EC 1.1.3.4). The enzyme was chemically modified with a β-cyclodextrin-branched carboxymethylcellulose polymer (CMC-CD), using carbodiimide as coupling agent. The obtained neoglycoenzyme had 0.78 mol of polysaccharide per mol of GOx and retained 67% of its initial activity. Comparison of some characteristics of the modified and free enzymes showed a higher Km for derivatized GOx and better thermostability, which increased from 45 °C to 51 °C. In addition, derivatization of GOx with CMC-CD increased its resistance to inactivation at 45 °C by 2.2-fold, protected the molecule against inactivation with the anionic surfactant sodium dodecylsulphate to the point that it retained 75% of its activity after an incubation of 3 h, and extended its pH tolerance toward alkaline pH (7.5). Covalent glycosidation of glucose oxidase with CD-branched carboxymethylcellulose polymer constitutes therefore an effective strategy for enhancing the stability of this enzyme.


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