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Effect of deglycosylation on the mediated electrocatalytic activity of recombinantly expressed Agaricus meleagris pyranose dehydrogenase wired by osmium redox polymer

Killyeni, Aniko; Yakovleva, Maria LU ; MacAodha, Domhnall; Conghaile, Peter O.; Gonaus, Christoph; Ortiz, Roberto LU ; Leech, Donal; Popescu, Ionel Catalin; Peterbauer, Clemens K. and Gorton, Lo LU (2014) In Electrochimica Acta 126. p.61-67
Abstract
The effect of deglycosylation of pyranose dehydrogenase (PDH) obtained from Agaricus meleagris (Am) and recombinantly expressed in Pichia pastoris on its electrocatalytic activity was investigated. Glycosylated (gAmPDH) and deglycosylated PDH (dgAmPDH) were immobilised on spectrographic graphite (G) simultaneously with an osmium redox polymer (Os-RP) using poly(ethylene glycol)(400) diglycidyl ether (PEGDGE) as cross-linking agent. The amperometric response to glucose, recorded at G/(Os-RP)-gAmPDH and G/(Os-RP)-dgAmPDH bioelectrodes, was optimised under flow injection conditions concerning the applied potential, enzyme loading, working pH and flow rate. The G/(Os-RP)dgAmPDH bioelectrode is characterised by better kinetic and... (More)
The effect of deglycosylation of pyranose dehydrogenase (PDH) obtained from Agaricus meleagris (Am) and recombinantly expressed in Pichia pastoris on its electrocatalytic activity was investigated. Glycosylated (gAmPDH) and deglycosylated PDH (dgAmPDH) were immobilised on spectrographic graphite (G) simultaneously with an osmium redox polymer (Os-RP) using poly(ethylene glycol)(400) diglycidyl ether (PEGDGE) as cross-linking agent. The amperometric response to glucose, recorded at G/(Os-RP)-gAmPDH and G/(Os-RP)-dgAmPDH bioelectrodes, was optimised under flow injection conditions concerning the applied potential, enzyme loading, working pH and flow rate. The G/(Os-RP)dgAmPDH bioelectrode is characterised by better kinetic and electroanalytical parameters compared with the G/(Os-RP)-gAmPDH bioelectrode: (i) a higher value of the maximum catalytic current density, j(max) = (146.6 +/- 2.6) mu A cm(-2) vs. j(max) = (80.9 +/- 1.9) mu A cm(-2); (ii) a lower value of the apparent Michaelis-Menten constant, K-M(app) = (2.4 +/- 0.1) mu M vs. K-M(app) = (7.5 +/- 0.3) mM; (iii) a higher slope of the linear domain, (43.6 +/- 1.1) mu A cm(-2) mM(-1) vs. (9.74 +/- 0.16) mu A cm(-2) mM(-1). Additionally, the time dependent decay of the amperometric response to glucose shows a slightly better operational stability for the G/(Os-RP)-dgAmPDH bioelectrode than that for the G/(Os-RP)-gAmPDH. The enzyme deglycosylation induces significant changes in the order of substrate selectivity for gAmPDH and dgAmPDH. (C) 2013 Elsevier Ltd. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Pyranose dehydrogenase, Osmium redox polymer, Mediated electron, transfer, Enzyme deglycosylation, Substrate selectivity
in
Electrochimica Acta
volume
126
pages
61 - 67
publisher
Pergamon
external identifiers
  • wos:000336340900008
  • scopus:84897995460
ISSN
0013-4686
DOI
10.1016/j.electacta.2013.08.069
language
English
LU publication?
yes
id
6678bb33-e5c9-4b47-803b-887d7d46b8cd (old id 4559232)
date added to LUP
2014-07-17 14:48:02
date last changed
2017-04-30 05:48:22
@article{6678bb33-e5c9-4b47-803b-887d7d46b8cd,
  abstract     = {The effect of deglycosylation of pyranose dehydrogenase (PDH) obtained from Agaricus meleagris (Am) and recombinantly expressed in Pichia pastoris on its electrocatalytic activity was investigated. Glycosylated (gAmPDH) and deglycosylated PDH (dgAmPDH) were immobilised on spectrographic graphite (G) simultaneously with an osmium redox polymer (Os-RP) using poly(ethylene glycol)(400) diglycidyl ether (PEGDGE) as cross-linking agent. The amperometric response to glucose, recorded at G/(Os-RP)-gAmPDH and G/(Os-RP)-dgAmPDH bioelectrodes, was optimised under flow injection conditions concerning the applied potential, enzyme loading, working pH and flow rate. The G/(Os-RP)dgAmPDH bioelectrode is characterised by better kinetic and electroanalytical parameters compared with the G/(Os-RP)-gAmPDH bioelectrode: (i) a higher value of the maximum catalytic current density, j(max) = (146.6 +/- 2.6) mu A cm(-2) vs. j(max) = (80.9 +/- 1.9) mu A cm(-2); (ii) a lower value of the apparent Michaelis-Menten constant, K-M(app) = (2.4 +/- 0.1) mu M vs. K-M(app) = (7.5 +/- 0.3) mM; (iii) a higher slope of the linear domain, (43.6 +/- 1.1) mu A cm(-2) mM(-1) vs. (9.74 +/- 0.16) mu A cm(-2) mM(-1). Additionally, the time dependent decay of the amperometric response to glucose shows a slightly better operational stability for the G/(Os-RP)-dgAmPDH bioelectrode than that for the G/(Os-RP)-gAmPDH. The enzyme deglycosylation induces significant changes in the order of substrate selectivity for gAmPDH and dgAmPDH. (C) 2013 Elsevier Ltd. All rights reserved.},
  author       = {Killyeni, Aniko and Yakovleva, Maria and MacAodha, Domhnall and Conghaile, Peter O. and Gonaus, Christoph and Ortiz, Roberto and Leech, Donal and Popescu, Ionel Catalin and Peterbauer, Clemens K. and Gorton, Lo},
  issn         = {0013-4686},
  keyword      = {Pyranose dehydrogenase,Osmium redox polymer,Mediated electron,transfer,Enzyme deglycosylation,Substrate selectivity},
  language     = {eng},
  pages        = {61--67},
  publisher    = {Pergamon},
  series       = {Electrochimica Acta},
  title        = {Effect of deglycosylation on the mediated electrocatalytic activity of recombinantly expressed Agaricus meleagris pyranose dehydrogenase wired by osmium redox polymer},
  url          = {http://dx.doi.org/10.1016/j.electacta.2013.08.069},
  volume       = {126},
  year         = {2014},
}