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Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities

The properties of disordered proteins are thought to depend on intrinsic conformational propensities for polyproline II (PP (II)) structure. While intrinsic PP (II) propensities have been measured for the common biological amino acids in short peptides, the ability of these experimentally determined...

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Detalles Bibliográficos
Autores principales: Tomasso, Maria E., Tarver, Micheal J., Devarajan, Deepa, Whitten, Steven T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699819/
https://www.ncbi.nlm.nih.gov/pubmed/26727467
http://dx.doi.org/10.1371/journal.pcbi.1004686
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author Tomasso, Maria E.
Tarver, Micheal J.
Devarajan, Deepa
Whitten, Steven T.
author_facet Tomasso, Maria E.
Tarver, Micheal J.
Devarajan, Deepa
Whitten, Steven T.
author_sort Tomasso, Maria E.
collection PubMed
description The properties of disordered proteins are thought to depend on intrinsic conformational propensities for polyproline II (PP (II)) structure. While intrinsic PP (II) propensities have been measured for the common biological amino acids in short peptides, the ability of these experimentally determined propensities to quantitatively reproduce structural behavior in intrinsically disordered proteins (IDPs) has not been established. Presented here are results from molecular simulations of disordered proteins showing that the hydrodynamic radius (R (h)) can be predicted from experimental PP (II) propensities with good agreement, even when charge-based considerations are omitted. The simulations demonstrate that R (h) and chain propensity for PP (II) structure are linked via a simple power-law scaling relationship, which was tested using the experimental R (h) of 22 IDPs covering a wide range of peptide lengths, net charge, and sequence composition. Charge effects on R (h) were found to be generally weak when compared to PP (II) effects on R (h). Results from this study indicate that the hydrodynamic dimensions of IDPs are evidence of considerable sequence-dependent backbone propensities for PP (II) structure that qualitatively, if not quantitatively, match conformational propensities measured in peptides.
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spelling pubmed-46998192016-01-15 Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities Tomasso, Maria E. Tarver, Micheal J. Devarajan, Deepa Whitten, Steven T. PLoS Comput Biol Research Article The properties of disordered proteins are thought to depend on intrinsic conformational propensities for polyproline II (PP (II)) structure. While intrinsic PP (II) propensities have been measured for the common biological amino acids in short peptides, the ability of these experimentally determined propensities to quantitatively reproduce structural behavior in intrinsically disordered proteins (IDPs) has not been established. Presented here are results from molecular simulations of disordered proteins showing that the hydrodynamic radius (R (h)) can be predicted from experimental PP (II) propensities with good agreement, even when charge-based considerations are omitted. The simulations demonstrate that R (h) and chain propensity for PP (II) structure are linked via a simple power-law scaling relationship, which was tested using the experimental R (h) of 22 IDPs covering a wide range of peptide lengths, net charge, and sequence composition. Charge effects on R (h) were found to be generally weak when compared to PP (II) effects on R (h). Results from this study indicate that the hydrodynamic dimensions of IDPs are evidence of considerable sequence-dependent backbone propensities for PP (II) structure that qualitatively, if not quantitatively, match conformational propensities measured in peptides. Public Library of Science 2016-01-04 /pmc/articles/PMC4699819/ /pubmed/26727467 http://dx.doi.org/10.1371/journal.pcbi.1004686 Text en © 2016 Tomasso et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Tomasso, Maria E.
Tarver, Micheal J.
Devarajan, Deepa
Whitten, Steven T.
Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities
title Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities
title_full Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities
title_fullStr Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities
title_full_unstemmed Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities
title_short Hydrodynamic Radii of Intrinsically Disordered Proteins Determined from Experimental Polyproline II Propensities
title_sort hydrodynamic radii of intrinsically disordered proteins determined from experimental polyproline ii propensities
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699819/
https://www.ncbi.nlm.nih.gov/pubmed/26727467
http://dx.doi.org/10.1371/journal.pcbi.1004686
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