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First Hyperpolarizability of Collagen Using the Point Dipole Approximation
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
2016 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 7, no 11, 2132-2138 p.Article in journal (Refereed) PublishedText
Abstract [en]

The application of localized hyperpolarizabilities to predict a total protein hyperpolarizability is presented for the first time, using rat-tail collagen as a demonstration example. We employ a model comprising the quadratic Applequist point-dipole approach, the so-called LoProp transformation, and a procedure with molecular fractionation using conjugate caps to determine the atomic and bond contributions to the net beta tensor of the collagen [(PPG)(10)](3) triple-helix. By using Tholes exponential damping modification to the dyadic tensor in the Applequist equations, a correct qualitative agreement with experiment is found. The intensity of the beta(HRS) signal and the depolarization ratios are best reproduced by decomposing the LoProp properties into the atomic positions and using Tholes exponential damping with the original damping parameter. Some ramifications of the model for general protein property optimization are briefly discussed.

Place, publisher, year, edition, pages
American Chemical Society , 2016. Vol. 7, no 11, 2132-2138 p.
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-189374DOI: 10.1021/acs.jpclett.6b00721ISI: 000377239200032PubMedID: 27203480ScopusID: 2-s2.0-84973569757OAI: diva2:947198

QC 20160707

Available from: 2016-07-07 Created: 2016-07-04 Last updated: 2016-07-07Bibliographically approved

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Harczuk, IgnatVahtras, OlavÅgren, Hans
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