Intra- versus intermolecular interactions in monellin: Contribution of surface charges to protein assembly
(2006) In Journal of Molecular Biology 358(5). p.1244-1255- Abstract
- The relative significance of weak non-covalent interactions in biological context has been much debated. Here, we have addressed the contribution of Coulombic interactions to protein stability and assembly experimentally. The sweet protein monellin, a non-covalently linked heterodimeric protein, was chosen for this study because of its ability to spontaneously reconstitute from separated fragments. The reconstitution of monellin mutants containing large surface charge perturbations was compared to the thermostability of structurally equivalent single-chain monellin containing the same sets of mutations under varying salt concentrations. The affinity between monellin fragments is found to correlate with the thermostability of single chain... (More)
- The relative significance of weak non-covalent interactions in biological context has been much debated. Here, we have addressed the contribution of Coulombic interactions to protein stability and assembly experimentally. The sweet protein monellin, a non-covalently linked heterodimeric protein, was chosen for this study because of its ability to spontaneously reconstitute from separated fragments. The reconstitution of monellin mutants containing large surface charge perturbations was compared to the thermostability of structurally equivalent single-chain monellin containing the same sets of mutations under varying salt concentrations. The affinity between monellin fragments is found to correlate with the thermostability of single chain monellin, indicating the involvement of the same underlying Coulombic interactions. This confirms that there are no principal differences in the interactions involved in folding and binding. Based on comparison with a previous mutational study involving hydrophobic core residues, the relative contribution of Coulombic interactions to stability and affinity is modest. However, the Coulombic perturbations only affect the association rates of reconstitution in contrast to perturbations involving hydrophobic residues, which affect primarily the dissociation rates. These results indicate that Coulombic interactions are likely to be of main importance for the association of protein assembly, relevant for functions of proteins. (c) 2006 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/408601
- author
- Xue, Wei-Feng LU ; Szczepankiewicz, Olga LU ; Bauer, Mikael LU ; Thulin, Eva LU and Linse, Sara LU
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- interactions, electrostatic, protein reconstitution, fragment complementation, global analysis, protein folding and binding
- in
- Journal of Molecular Biology
- volume
- 358
- issue
- 5
- pages
- 1244 - 1255
- publisher
- Elsevier
- external identifiers
-
- wos:000237689600006
- pmid:16574151
- scopus:33646091307
- ISSN
- 1089-8638
- DOI
- 10.1016/j.jmb.2006.02.069
- language
- English
- LU publication?
- yes
- id
- 5a7bd3b2-67d7-402c-a9a7-6bf126a0b3d6 (old id 408601)
- date added to LUP
- 2016-04-01 15:25:31
- date last changed
- 2022-01-28 05:16:12
@article{5a7bd3b2-67d7-402c-a9a7-6bf126a0b3d6,
abstract = {{The relative significance of weak non-covalent interactions in biological context has been much debated. Here, we have addressed the contribution of Coulombic interactions to protein stability and assembly experimentally. The sweet protein monellin, a non-covalently linked heterodimeric protein, was chosen for this study because of its ability to spontaneously reconstitute from separated fragments. The reconstitution of monellin mutants containing large surface charge perturbations was compared to the thermostability of structurally equivalent single-chain monellin containing the same sets of mutations under varying salt concentrations. The affinity between monellin fragments is found to correlate with the thermostability of single chain monellin, indicating the involvement of the same underlying Coulombic interactions. This confirms that there are no principal differences in the interactions involved in folding and binding. Based on comparison with a previous mutational study involving hydrophobic core residues, the relative contribution of Coulombic interactions to stability and affinity is modest. However, the Coulombic perturbations only affect the association rates of reconstitution in contrast to perturbations involving hydrophobic residues, which affect primarily the dissociation rates. These results indicate that Coulombic interactions are likely to be of main importance for the association of protein assembly, relevant for functions of proteins. (c) 2006 Elsevier Ltd. All rights reserved.}},
author = {{Xue, Wei-Feng and Szczepankiewicz, Olga and Bauer, Mikael and Thulin, Eva and Linse, Sara}},
issn = {{1089-8638}},
keywords = {{interactions; electrostatic; protein reconstitution; fragment complementation; global analysis; protein folding and binding}},
language = {{eng}},
number = {{5}},
pages = {{1244--1255}},
publisher = {{Elsevier}},
series = {{Journal of Molecular Biology}},
title = {{Intra- versus intermolecular interactions in monellin: Contribution of surface charges to protein assembly}},
url = {{http://dx.doi.org/10.1016/j.jmb.2006.02.069}},
doi = {{10.1016/j.jmb.2006.02.069}},
volume = {{358}},
year = {{2006}},
}