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Activity and stability of different immobilized preparations of recombinant E. coli cells containing omega-transaminase

Rehn, Gustav LU ; Grey, Carl LU ; Branneby, Cecilia; Lindberg, Lina and Adlercreutz, Patrick LU (2012) In Process Biochemistry 47(7). p.1129-1134
Abstract
Production of chiral amines using omega-transaminases has been thoroughly studied in recent years. Immobilized w-transaminases, however, have been used on relatively few occasions despite potential benefits such as reuse of enzyme and ease of product purification. In this study principally different methods including surface immobilization, entrapment and sweep flocculation using titanium oxide. Ca-alginate and chitosan respectively were evaluated for the immobilization of recombinant Escherichia coil cells. The enzyme expressed was a modified Arthrobacter citreus omega-transaminase with improved thermostability. The preparations were compared in terms of cell loading capacity, operational stability in repeated batches and storage... (More)
Production of chiral amines using omega-transaminases has been thoroughly studied in recent years. Immobilized w-transaminases, however, have been used on relatively few occasions despite potential benefits such as reuse of enzyme and ease of product purification. In this study principally different methods including surface immobilization, entrapment and sweep flocculation using titanium oxide. Ca-alginate and chitosan respectively were evaluated for the immobilization of recombinant Escherichia coil cells. The enzyme expressed was a modified Arthrobacter citreus omega-transaminase with improved thermostability. The preparations were compared in terms of cell loading capacity, operational stability in repeated batches and storage stability using the conversion of methylbenzylamine to acetophenone. The use of chitosan for cell immobilization proved to be the method of choice since it was both very simple and effective. At a very high cell loading of 3.2 g cells/g chitosan >60% activity was observed. The preparation was reused in eight successive 1-h batches with >90% remaining activity. To further demonstrate its usability the preparation was used for asymmetric synthesis of (S)-4'-cyano-(alpha)-methylbenzylamine in three repeated bathes (cycle time >20 h), using isopropylamine as the amine donor. Storage stability was comparable with that of non-immobilized cells. It was concluded that the chitosan method due to its properties and simplicity would be advantageous for use also on a larger scale. (c) 2012 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Chiral amines, omega-Transaminase, Immobilization, Chitosan, Alginate, Titanium oxide, Methylbenzylamine
in
Process Biochemistry
volume
47
issue
7
pages
1129 - 1134
publisher
Elsevier
external identifiers
  • wos:000309333600016
  • scopus:84861330688
ISSN
1873-3298
DOI
10.1016/j.procbio.2012.04.013
language
English
LU publication?
yes
id
ebedc1f2-f369-40bb-87b5-2ea0abb8f30e (old id 3284027)
date added to LUP
2012-12-18 19:35:24
date last changed
2017-08-13 03:03:35
@article{ebedc1f2-f369-40bb-87b5-2ea0abb8f30e,
  abstract     = {Production of chiral amines using omega-transaminases has been thoroughly studied in recent years. Immobilized w-transaminases, however, have been used on relatively few occasions despite potential benefits such as reuse of enzyme and ease of product purification. In this study principally different methods including surface immobilization, entrapment and sweep flocculation using titanium oxide. Ca-alginate and chitosan respectively were evaluated for the immobilization of recombinant Escherichia coil cells. The enzyme expressed was a modified Arthrobacter citreus omega-transaminase with improved thermostability. The preparations were compared in terms of cell loading capacity, operational stability in repeated batches and storage stability using the conversion of methylbenzylamine to acetophenone. The use of chitosan for cell immobilization proved to be the method of choice since it was both very simple and effective. At a very high cell loading of 3.2 g cells/g chitosan >60% activity was observed. The preparation was reused in eight successive 1-h batches with >90% remaining activity. To further demonstrate its usability the preparation was used for asymmetric synthesis of (S)-4'-cyano-(alpha)-methylbenzylamine in three repeated bathes (cycle time >20 h), using isopropylamine as the amine donor. Storage stability was comparable with that of non-immobilized cells. It was concluded that the chitosan method due to its properties and simplicity would be advantageous for use also on a larger scale. (c) 2012 Elsevier Ltd. All rights reserved.},
  author       = {Rehn, Gustav and Grey, Carl and Branneby, Cecilia and Lindberg, Lina and Adlercreutz, Patrick},
  issn         = {1873-3298},
  keyword      = {Chiral amines,omega-Transaminase,Immobilization,Chitosan,Alginate,Titanium oxide,Methylbenzylamine},
  language     = {eng},
  number       = {7},
  pages        = {1129--1134},
  publisher    = {Elsevier},
  series       = {Process Biochemistry},
  title        = {Activity and stability of different immobilized preparations of recombinant E. coli cells containing omega-transaminase},
  url          = {http://dx.doi.org/10.1016/j.procbio.2012.04.013},
  volume       = {47},
  year         = {2012},
}