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Enzyme-inorganic nanoporous materials: Stabilization of proteins intercalated in alpha-zirconium(IV) phosphate by a denaturant

Bhambhani, Akhilesh and Kumar, Challa V. (2008) Enzyme-inorganic nanoporous materials: Stabilization of proteins intercalated in alpha-zirconium(IV) phosphate by a denaturant. MICROPOROUS AND MESOPOROUS MATERIALS, 110 (2-3). pp. 517-527.

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Abstract

Improving the stability of proteins and enzymes at solid-liquid interfaces is challenging and it has important implications in biocatalysis and biosensors. Here, we report that moderate concentrations of urea stabilize heme proteins, such as met-hemoglobin (Hb) or met-myoglobin (Mb) bound to alpha-zirconium phosphate (alpha-ZrP). The half-life of Hb intercalated in the galleries of alpha-ZrP, for example, increased from 127 h (no urea) to >235 h (2 M urea). The peroxidase-like activity of Hb intercalated in alpha-ZrP was also improved by the addition of urea, and the product yields increased from 44% (no urea) to 79% (2 M urea). These improvements are not limited to Hb, and similar results also observed with Mb. Urea also inhibited the dithionite reduction of the ferric form of the intercalated heme proteins to their corresponding ferrous forms but not the oxidation of the ferric form to the corresponding high valent iron-oxo species. These observations open new possibilities to control the properties of immobilized proteins. (C) 2007 Elsevier Inc. All rights reserved.

Item Type:Article
Uncontrolled Keywords:hemoglobin; zirconium phosphate; biocatalysis; circular dichroism; myoglobin; secondary structure; urea-induced stabilization
Subjects:Biomedical Science > Nanobiotechnology
Material Science > Bio materials
ID Code:6099
Deposited By:IoN
Deposited On:04 Sep 2009 14:04
Last Modified:04 Sep 2009 14:04

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