Preparation of cross-linked enzyme aggregates of trehalose synthase via co-aggregation with polyethyleneimine.

Abstract:

:Trehalose synthase (TreS) from Meiothermus ruber was co-aggregated with polyethyleneimine (PEI) and precipitated with polyethylene glycol (PEG), followed by cross-linking with glutaraldehyde to obtain TreS-polyethyleneimine cross-linked enzyme aggregates (termed as CLEAs-PEI-PEG). The TreS solution at 0.5 mg mL(-1) protein concentration, with PEI at a mass ratio of 1:0.8 (enzyme/PEI, w/w) and 25 % (w/v) PEG concentration were found to be most adequate for the co-aggregation of TreS. CLEAs-PEI-PEG was most active with glutaraldehyde at a mass ratio of 1:0.5 (enzyme/glutaraldehyde, w/w) to cross-link the co-aggregates. The CLEAs-PEI-PEG prepared in this work had an optimum pH of 6.5 and optimum temperature of 60 °C. For lower concentrations of enzyme, using PEI could enhance the cross-linking efficiency of TreS. The thermal stability and pH tolerance of CLEAs-PEI-PEG were significantly improved. Scanning electron microscopy revealed that the main structure of CLEAs-PEI-PEG showed scaffolding morphology which was constituted by structured ball-like particles with a size of 1-2.5 μm in diameter.

authors

Zheng J,Chen Y,Yang L,Li M,Zhang J

doi

10.1007/s12010-014-1104-y

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

2067-78

issue

6

eissn

0273-2289

issn

1559-0291

journal_volume

174

pub_type

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