Linker Dependence of Avidity in Multivalent Interactions between Disordered Proteins

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Linker Dependence of Avidity in Multivalent Interactions between Disordered Proteins. / Sørensen, Charlotte S; Jendroszek, Agnieszka; Kjærgaard, Magnus.

I: Journal of Molecular Biology, Bind 431, Nr. 24, 12.2019, s. 4784-4795.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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Sørensen, Charlotte S ; Jendroszek, Agnieszka ; Kjærgaard, Magnus. / Linker Dependence of Avidity in Multivalent Interactions between Disordered Proteins. I: Journal of Molecular Biology. 2019 ; Bind 431, Nr. 24. s. 4784-4795.

Bibtex

@article{e0587a43fed742d0997e8498451d53eb,
title = "Linker Dependence of Avidity in Multivalent Interactions between Disordered Proteins",
abstract = "Multidomain proteins often interact through several independent binding sites connected by disordered linkers. The architecture of such linkers affect avidity by modulating the effective concentration of intra-molecular binding. The linker dependence of avidity has been estimated theoretically using simple physical models, but such models have not been tested experimentally since the effective concentrations could not be measured directly. We have developed a model system for bivalent protein interactions connected by disordered linkers, where the effective concentration can be measured using a competition experiment. We characterized the bivalent protein interactions kinetically and thermodynamically for a variety of linker lengths and interaction strengths. In total, this allowed us to critically assess the existing theoretical models of avidity in disordered, multivalent interactions. As expected, the onset of avidity occurs when the effective concentration reached the dissociation constant of the weakest interaction. Avidity decreased monotonously with linker length, but only by a third of what is predicted by theoretical models. We suggest that the length dependence of avidity is attenuated by compensating mechanisms such as linker interactions or entanglement. The direct role of linkers in avidity suggest they provide a generic mechanism for allosteric regulation of disordered, multivalent proteins.",
author = "S{\o}rensen, {Charlotte S} and Agnieszka Jendroszek and Magnus Kj{\ae}rgaard",
note = "Copyright {\textcopyright} 2019. Published by Elsevier Ltd.",
year = "2019",
month = dec,
doi = "10.1016/j.jmb.2019.09.001",
language = "English",
volume = "431",
pages = "4784--4795",
journal = "Journal of Molecular Biology",
issn = "0022-2836",
publisher = "Academic Press",
number = "24",

}

RIS

TY - JOUR

T1 - Linker Dependence of Avidity in Multivalent Interactions between Disordered Proteins

AU - Sørensen, Charlotte S

AU - Jendroszek, Agnieszka

AU - Kjærgaard, Magnus

N1 - Copyright © 2019. Published by Elsevier Ltd.

PY - 2019/12

Y1 - 2019/12

N2 - Multidomain proteins often interact through several independent binding sites connected by disordered linkers. The architecture of such linkers affect avidity by modulating the effective concentration of intra-molecular binding. The linker dependence of avidity has been estimated theoretically using simple physical models, but such models have not been tested experimentally since the effective concentrations could not be measured directly. We have developed a model system for bivalent protein interactions connected by disordered linkers, where the effective concentration can be measured using a competition experiment. We characterized the bivalent protein interactions kinetically and thermodynamically for a variety of linker lengths and interaction strengths. In total, this allowed us to critically assess the existing theoretical models of avidity in disordered, multivalent interactions. As expected, the onset of avidity occurs when the effective concentration reached the dissociation constant of the weakest interaction. Avidity decreased monotonously with linker length, but only by a third of what is predicted by theoretical models. We suggest that the length dependence of avidity is attenuated by compensating mechanisms such as linker interactions or entanglement. The direct role of linkers in avidity suggest they provide a generic mechanism for allosteric regulation of disordered, multivalent proteins.

AB - Multidomain proteins often interact through several independent binding sites connected by disordered linkers. The architecture of such linkers affect avidity by modulating the effective concentration of intra-molecular binding. The linker dependence of avidity has been estimated theoretically using simple physical models, but such models have not been tested experimentally since the effective concentrations could not be measured directly. We have developed a model system for bivalent protein interactions connected by disordered linkers, where the effective concentration can be measured using a competition experiment. We characterized the bivalent protein interactions kinetically and thermodynamically for a variety of linker lengths and interaction strengths. In total, this allowed us to critically assess the existing theoretical models of avidity in disordered, multivalent interactions. As expected, the onset of avidity occurs when the effective concentration reached the dissociation constant of the weakest interaction. Avidity decreased monotonously with linker length, but only by a third of what is predicted by theoretical models. We suggest that the length dependence of avidity is attenuated by compensating mechanisms such as linker interactions or entanglement. The direct role of linkers in avidity suggest they provide a generic mechanism for allosteric regulation of disordered, multivalent proteins.

U2 - 10.1016/j.jmb.2019.09.001

DO - 10.1016/j.jmb.2019.09.001

M3 - Journal article

C2 - 31518611

VL - 431

SP - 4784

EP - 4795

JO - Journal of Molecular Biology

JF - Journal of Molecular Biology

SN - 0022-2836

IS - 24

ER -