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The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family

Surface charge residues have been recognized as one of the stability determinants in protein. In this study, we sought to compare and analyse the stability and conformational dynamics of staphylococcal lipase mutants with surface lysine mutation using computational and experimental methods. Three hi...

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Autores principales: Ahmad, Nurul Nadirah, Ahmad Kamarudin, Nor Hafizah, Leow, Adam Thean Chor, Rahman, Raja Noor Zaliha Raja Abd.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7504586/
https://www.ncbi.nlm.nih.gov/pubmed/32854267
http://dx.doi.org/10.3390/molecules25173858
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author Ahmad, Nurul Nadirah
Ahmad Kamarudin, Nor Hafizah
Leow, Adam Thean Chor
Rahman, Raja Noor Zaliha Raja Abd.
author_facet Ahmad, Nurul Nadirah
Ahmad Kamarudin, Nor Hafizah
Leow, Adam Thean Chor
Rahman, Raja Noor Zaliha Raja Abd.
author_sort Ahmad, Nurul Nadirah
collection PubMed
description Surface charge residues have been recognized as one of the stability determinants in protein. In this study, we sought to compare and analyse the stability and conformational dynamics of staphylococcal lipase mutants with surface lysine mutation using computational and experimental methods. Three highly mutable and exposed lysine residues (Lys91, Lys177, Lys325) were targeted to generate six mutant lipases in silico. The model structures were simulated in water environment at 25 °C. Our simulations showed that the stability was compromised when Lys177 was substituted while mutation at position 91 and 325 improved the stability. To illustrate the putative alterations of enzyme stability in the stabilising mutants, we characterized single mutant K325G and double mutant K91A/K325G. Both mutants showed a 5 °C change in optimal temperature compared to their wild type. Single mutant K325G rendered a longer half-life at 25 °C (T(1/2) = 21 h) while double mutant K91A/K325G retained only 40% of relative activity after 12 h incubation. The optimal pH for mutant K325G was shifted from 8 to 9 and similar substrate preference was observed for the wild type and two mutants. Our findings indicate that surface lysine mutation alters the enzymatic behaviour and, thus, rationalizes the functional effects of surface exposed lysine in conformational stability and activity of this lipase.
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spelling pubmed-75045862020-09-24 The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family Ahmad, Nurul Nadirah Ahmad Kamarudin, Nor Hafizah Leow, Adam Thean Chor Rahman, Raja Noor Zaliha Raja Abd. Molecules Article Surface charge residues have been recognized as one of the stability determinants in protein. In this study, we sought to compare and analyse the stability and conformational dynamics of staphylococcal lipase mutants with surface lysine mutation using computational and experimental methods. Three highly mutable and exposed lysine residues (Lys91, Lys177, Lys325) were targeted to generate six mutant lipases in silico. The model structures were simulated in water environment at 25 °C. Our simulations showed that the stability was compromised when Lys177 was substituted while mutation at position 91 and 325 improved the stability. To illustrate the putative alterations of enzyme stability in the stabilising mutants, we characterized single mutant K325G and double mutant K91A/K325G. Both mutants showed a 5 °C change in optimal temperature compared to their wild type. Single mutant K325G rendered a longer half-life at 25 °C (T(1/2) = 21 h) while double mutant K91A/K325G retained only 40% of relative activity after 12 h incubation. The optimal pH for mutant K325G was shifted from 8 to 9 and similar substrate preference was observed for the wild type and two mutants. Our findings indicate that surface lysine mutation alters the enzymatic behaviour and, thus, rationalizes the functional effects of surface exposed lysine in conformational stability and activity of this lipase. MDPI 2020-08-25 /pmc/articles/PMC7504586/ /pubmed/32854267 http://dx.doi.org/10.3390/molecules25173858 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ahmad, Nurul Nadirah
Ahmad Kamarudin, Nor Hafizah
Leow, Adam Thean Chor
Rahman, Raja Noor Zaliha Raja Abd.
The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family
title The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family
title_full The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family
title_fullStr The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family
title_full_unstemmed The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family
title_short The Role of Surface Exposed Lysine in Conformational Stability and Functional Properties of Lipase from Staphylococcus Family
title_sort role of surface exposed lysine in conformational stability and functional properties of lipase from staphylococcus family
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7504586/
https://www.ncbi.nlm.nih.gov/pubmed/32854267
http://dx.doi.org/10.3390/molecules25173858
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