Cargando…

Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy

[Image: see text] Most fluorescent proteins exhibit multiexponential fluorescence decays, indicating a heterogeneous excited state population. FRET between fluorescent proteins should therefore involve multiple energy transfer pathways. We recently demonstrated the FRET pathways between EGFP and mCh...

Descripción completa

Detalles Bibliográficos
Autores principales: Blacker, Thomas S., Chen, WeiYue, Avezov, Edward, Marsh, Richard J., Duchen, Michael R., Kaminski, Clemens F., Bain, Angus J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2016
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5309863/
https://www.ncbi.nlm.nih.gov/pubmed/28217242
http://dx.doi.org/10.1021/acs.jpcc.6b11235
_version_ 1782507783471497216
author Blacker, Thomas S.
Chen, WeiYue
Avezov, Edward
Marsh, Richard J.
Duchen, Michael R.
Kaminski, Clemens F.
Bain, Angus J.
author_facet Blacker, Thomas S.
Chen, WeiYue
Avezov, Edward
Marsh, Richard J.
Duchen, Michael R.
Kaminski, Clemens F.
Bain, Angus J.
author_sort Blacker, Thomas S.
collection PubMed
description [Image: see text] Most fluorescent proteins exhibit multiexponential fluorescence decays, indicating a heterogeneous excited state population. FRET between fluorescent proteins should therefore involve multiple energy transfer pathways. We recently demonstrated the FRET pathways between EGFP and mCherry (mC), upon the dimerization of 3-phosphoinositide dependent protein kinase 1 (PDK1), to be highly restricted. A mechanism for FRET restriction based on a highly unfavorable κ(2) orientation factor arising from differences in donor–acceptor transition dipole moment angles in a far from coplanar and near static interaction geometry was proposed. Here this is tested via FRET to mC arising from the association of glutathione (GSH) and glutathione S-transferase (GST) with an intrinsically homogeneous and more mobile donor Oregon Green 488 (OG). A new analysis of the acceptor window intensity, based on the turnover point of the sensitized fluorescence, is combined with donor window intensity and anisotropy measurements which show that unrestricted FRET to mC takes place. However, a long-lived anisotropy decay component in the donor window reveals a GST-GSH population in which FRET does not occur, explaining previous discrepancies between quantitative FRET measurements of GST-GSH association and their accepted values. This reinforces the importance of the local donor–acceptor environment in mediating energy transfer and the need to perform spectrally resolved intensity and anisotropy decay measurements in the accurate quantification of fluorescent protein FRET.
format Online
Article
Text
id pubmed-5309863
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher American Chemical Society
record_format MEDLINE/PubMed
spelling pubmed-53098632017-02-16 Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy Blacker, Thomas S. Chen, WeiYue Avezov, Edward Marsh, Richard J. Duchen, Michael R. Kaminski, Clemens F. Bain, Angus J. J Phys Chem C Nanomater Interfaces [Image: see text] Most fluorescent proteins exhibit multiexponential fluorescence decays, indicating a heterogeneous excited state population. FRET between fluorescent proteins should therefore involve multiple energy transfer pathways. We recently demonstrated the FRET pathways between EGFP and mCherry (mC), upon the dimerization of 3-phosphoinositide dependent protein kinase 1 (PDK1), to be highly restricted. A mechanism for FRET restriction based on a highly unfavorable κ(2) orientation factor arising from differences in donor–acceptor transition dipole moment angles in a far from coplanar and near static interaction geometry was proposed. Here this is tested via FRET to mC arising from the association of glutathione (GSH) and glutathione S-transferase (GST) with an intrinsically homogeneous and more mobile donor Oregon Green 488 (OG). A new analysis of the acceptor window intensity, based on the turnover point of the sensitized fluorescence, is combined with donor window intensity and anisotropy measurements which show that unrestricted FRET to mC takes place. However, a long-lived anisotropy decay component in the donor window reveals a GST-GSH population in which FRET does not occur, explaining previous discrepancies between quantitative FRET measurements of GST-GSH association and their accepted values. This reinforces the importance of the local donor–acceptor environment in mediating energy transfer and the need to perform spectrally resolved intensity and anisotropy decay measurements in the accurate quantification of fluorescent protein FRET. American Chemical Society 2016-12-29 2017-01-26 /pmc/articles/PMC5309863/ /pubmed/28217242 http://dx.doi.org/10.1021/acs.jpcc.6b11235 Text en Copyright © 2016 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Blacker, Thomas S.
Chen, WeiYue
Avezov, Edward
Marsh, Richard J.
Duchen, Michael R.
Kaminski, Clemens F.
Bain, Angus J.
Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy
title Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy
title_full Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy
title_fullStr Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy
title_full_unstemmed Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy
title_short Investigating State Restriction in Fluorescent Protein FRET Using Time-Resolved Fluorescence and Anisotropy
title_sort investigating state restriction in fluorescent protein fret using time-resolved fluorescence and anisotropy
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5309863/
https://www.ncbi.nlm.nih.gov/pubmed/28217242
http://dx.doi.org/10.1021/acs.jpcc.6b11235
work_keys_str_mv AT blackerthomass investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy
AT chenweiyue investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy
AT avezovedward investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy
AT marshrichardj investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy
AT duchenmichaelr investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy
AT kaminskiclemensf investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy
AT bainangusj investigatingstaterestrictioninfluorescentproteinfretusingtimeresolvedfluorescenceandanisotropy