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On the nature of uncoupled chlorophylls in the extremophilic photosystem I-light harvesting I supercomplex

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dc.abstract.enPhotosystem I core-light-harvesting antenna supercomplexes (PSI-LHCI) were isolated from the extremophilic red alga Cyanidioschyzon merolae and studied by three fluorescence techniques in order to characterize chlorophylls (Chls) energetically uncoupled from the PSI reaction center (RC). Such Chls are observed in virtually all optical experiments of any PSI core and PSI-LHCI supercomplex preparations across various species and may influence the operation of PSI-based solar cells and other biohybrid systems. However, the nature of the uncoupled Chls (uChls) has never been explored deeply before. In this work, the amount of uChls was controlled by stirring the solution of C. merolae PSI-LHCI supercomplex samples at elevated temperature (~303 K) and was found to increase from <2% in control samples up to 47% in solutions stirred for 3.5 h. The fluorescence spectrum of uChls was found to be blue-shifted by ~20 nm (to ~680 nm) relative to the fluorescence band from Chls that are well coupled to PSI RC. This effect indicates that mechanical stirring leads to disappearance of some red Chls (emitting at above ~700 nm) that are present in the intact LHCI antenna associated with the PSI core. Comparative diffusion studies of control and stirred samples by fluorescence correlation spectroscopy together with biochemical analysis by SDS-PAGE and BN-PAGE indicate that energetically uncoupled Lhcr subunits are likely to be still physically attached to the PSI core, albeit with altered three-dimensional organization due to the mechanical stress.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKarolczak, Jerzy
dc.contributor.authorSzewczyk, Sebastian
dc.contributor.authorAbram, Mateusz
dc.contributor.authorHaniewicz, Patrycja
dc.contributor.authorBiałek, Rafał
dc.contributor.authorGapiński, Jacek
dc.contributor.authorGibasiewicz, Krzysztof
dc.contributor.authorKargul, Joanna
dc.date.accessioned2024-01-25T15:46:37Z
dc.date.available2024-01-25T15:46:37Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.volume1861
dc.identifier.doi10.1016/J.BBABIO.2019.148136
dc.identifier.issn0005-2728
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114834
dc.languageeng
dc.pbn.affiliationbiological sciences
dc.relation.ispartofBiochimica et Biophysica Acta - Bioenergetics
dc.relation.pages148136
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enBiosolar photovoltaic cells
dc.subject.enFluorescence correlation spectroscopy
dc.subject.enLight harvesting complex I
dc.subject.enPhotosystem I
dc.subject.enTime-resolved fluorescence
dc.subject.enUncoupled chlorophylls.
dc.titleOn the nature of uncoupled chlorophylls in the extremophilic photosystem I-light harvesting I supercomplex
dc.typeJournalArticle
dspace.entity.typePublication