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Complexation of Gre...
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Ashworth, Eleanor K.
(författare)
Complexation of Green and Red Kaede Fluorescent Protein Chromophores by a Zwitterion to Probe Electrostatic and Induction Field Effects
- Artikel/kapitelEngelska2022
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2022-02-09
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American Chemical Society (ACS),2022
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LIBRIS-ID:oai:DiVA.org:su-203504
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-203504URI
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https://doi.org/10.1021/acs.jpca.1c10628DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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The photophysics of green fluorescent protein (GFP) and red Kaede fluorescent protein (rKFP) are defined by the intrinsic properties of the light-absorbing chromophore and its interaction with the protein binding pocket. This work deploys photodissociation action spectroscopy to probe the absorption profiles for a series of synthetic GFP and rKFP chromophores as the bare anions and as complexes with the betaine zwitterion, which is assumed as a model for dipole microsolvation. Electronic structure calculations and energy decomposition analysis using Symmetry-Adapted Perturbation Theory are used to characterize gas-phase structures and complex cohesion forces. The calculations reveal a preponderance for coordination of betaine to the phenoxide deprotonation site predominantly through electrostatic forces. Calculations using the STEOM-DLPNO-CCSD method are able to reproduce absolute and relative vertical excitation energies for the bare anions and anion–betaine complexes. On the other hand, treatment of the betaine molecule with a point-charge model, in which the charges are computed from some common electron density population analysis schemes, show that just electrostatic and point-charge induction interactions are unable to account for the betaine-induced spectral shift. The present methodology could be applied to investigate cluster forces and optical properties in other gas-phase ion–zwitterion complexes.
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Stockett, Mark H.Stockholms universitet,Fysikum(Swepub:su)mstoc
(författare)
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Kjaer, Christina
(författare)
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Page, Philip C. Bulman
(författare)
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Meech, Stephen R.
(författare)
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Nielsen, Steen Brondsted
(författare)
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Bull, James N.
(författare)
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Stockholms universitetFysikum
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Physical Chemistry A: American Chemical Society (ACS)126:7, s. 1158-11671089-56391520-5215
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