Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling
Polyols are enzymatically-produced plant compounds which can act as compatible solutes during periods of abiotic stress. NAD+-dependent SORBITOL DEHYDROGENASE (SDH, E.C. 1.1.1.14) from Arabidopsis thaliana L. (AtSDH) is capable of oxidizing several polyols including sorbitol, ribitol and xylitol. In...
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doaj-46627525aa824460a9d6f1c1a7c2dae62020-11-24T21:00:44ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2015-02-01610.3389/fpls.2015.00091130385Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modelingMaría Francisca eAguayo0Juan Carlos eCáceres1Matías eFuentealba2Rodrigo eMuñoz3Claudia eStange4Ricardo eCabrera5Michael eHandford6Universidad de ChileUniversidad de ChileUniversidad de ChileUniversidad de ChileUniversidad de ChileUniversidad de ChileUniversidad de ChilePolyols are enzymatically-produced plant compounds which can act as compatible solutes during periods of abiotic stress. NAD+-dependent SORBITOL DEHYDROGENASE (SDH, E.C. 1.1.1.14) from Arabidopsis thaliana L. (AtSDH) is capable of oxidizing several polyols including sorbitol, ribitol and xylitol. In the present study, enzymatic assays using recombinant AtSDH demonstrated a higher specificity constant for xylitol compared to sorbitol and ribitol, all of which are C2 (S) and C4 (R) polyols. Enzyme activity was reduced by preincubation with ethylenediaminetetraacetic acid (EDTA), indicating a requirement for zinc ions. In humans, it has been proposed that sorbitol becomes part of a pentahedric coordination sphere of the catalytic zinc during the reaction mechanism. In order to determine the validity of this pentahedric coordination model in a plant SDH, homology modeling and Molecular Dynamics simulations of AtSDH ternary complexes with the three polyols were performed using crystal structures of human and Bemisia argentifolii (Genn.) (Hemiptera: Aleyrodidae) SDHs as scaffolds. The results indicate that the differences in interaction with structural water molecules correlate very well with the observed enzymatic parameters, validate the proposed pentahedric coordination of the catalytic zinc ion in a plant SDH, and provide an explanation for why AtSDH shows a preference for polyols with a chirality of C2 (S) and C4 (R).http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00091/fullMolecular Dynamics SimulationArabidopsis thalianaHomology ModelingpolyolPentavalent Zinc |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
María Francisca eAguayo Juan Carlos eCáceres Matías eFuentealba Rodrigo eMuñoz Claudia eStange Ricardo eCabrera Michael eHandford |
spellingShingle |
María Francisca eAguayo Juan Carlos eCáceres Matías eFuentealba Rodrigo eMuñoz Claudia eStange Ricardo eCabrera Michael eHandford Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling Frontiers in Plant Science Molecular Dynamics Simulation Arabidopsis thaliana Homology Modeling polyol Pentavalent Zinc |
author_facet |
María Francisca eAguayo Juan Carlos eCáceres Matías eFuentealba Rodrigo eMuñoz Claudia eStange Ricardo eCabrera Michael eHandford |
author_sort |
María Francisca eAguayo |
title |
Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling |
title_short |
Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling |
title_full |
Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling |
title_fullStr |
Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling |
title_full_unstemmed |
Polyol specificity of recombinant Arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling |
title_sort |
polyol specificity of recombinant arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Plant Science |
issn |
1664-462X |
publishDate |
2015-02-01 |
description |
Polyols are enzymatically-produced plant compounds which can act as compatible solutes during periods of abiotic stress. NAD+-dependent SORBITOL DEHYDROGENASE (SDH, E.C. 1.1.1.14) from Arabidopsis thaliana L. (AtSDH) is capable of oxidizing several polyols including sorbitol, ribitol and xylitol. In the present study, enzymatic assays using recombinant AtSDH demonstrated a higher specificity constant for xylitol compared to sorbitol and ribitol, all of which are C2 (S) and C4 (R) polyols. Enzyme activity was reduced by preincubation with ethylenediaminetetraacetic acid (EDTA), indicating a requirement for zinc ions. In humans, it has been proposed that sorbitol becomes part of a pentahedric coordination sphere of the catalytic zinc during the reaction mechanism. In order to determine the validity of this pentahedric coordination model in a plant SDH, homology modeling and Molecular Dynamics simulations of AtSDH ternary complexes with the three polyols were performed using crystal structures of human and Bemisia argentifolii (Genn.) (Hemiptera: Aleyrodidae) SDHs as scaffolds. The results indicate that the differences in interaction with structural water molecules correlate very well with the observed enzymatic parameters, validate the proposed pentahedric coordination of the catalytic zinc ion in a plant SDH, and provide an explanation for why AtSDH shows a preference for polyols with a chirality of C2 (S) and C4 (R). |
topic |
Molecular Dynamics Simulation Arabidopsis thaliana Homology Modeling polyol Pentavalent Zinc |
url |
http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00091/full |
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