ArticleBiophysical journal2011
Flow of excitation energy in the cryptophyte light-harvesting antenna phycocyanin 645.
Article in Biophysical journal, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- pH-Dependent Vibrational Dynamics Drives Excited-State Quenching in the Phycobiliprotein Complex PC645.Journal of the American Chemical Society · 2026Article
- Convenient Preparation and Energy Transfer Kinetic Process Verification by Ultrafast Time-resolved Fluorescence Spectra for Natural Cryptophyte Phycocyanin 645.Journal of fluorescence · 2026Article
- Infrared Signatures of Phycobilins within the Phycocyanin 645 Complex.The journal of physical chemistry. B · 2023Article
- Coherent phenomena in photosynthetic light harvesting: part two-observations in biological systems.Biophysical reviews · 2018Review
- Local protein solvation drives direct down-conversion in phycobiliprotein PC645 via incoherent vibronic transport.Proceedings of the National Academy of Sciences of the United States of America · 2018Article
- Bright blue-shifted fluorescent proteins with Cys in the GAF domain engineered from bacterial phytochromes: fluorescence mechanisms and excited-state dynamics.Scientific reports · 2016Article
- Chromophore composition of the phycobiliprotein Cr-PC577 from the cryptophyte Hemiselmis pacifica.Photosynthesis research · 2014Article
- Single-residue insertion switches the quaternary structure and exciton states of cryptophyte light-harvesting proteins.Proceedings of the National Academy of Sciences of the United States of America · 2014Article
- Photosynthetic light harvesting: excitons and coherence.Journal of the Royal Society, Interface · 2014Review
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We report a detailed description of the energy migration dynamics in the phycocyanin 645 (PC645) antenna complex from the photosynthetic alga Chroomonas CCMP270. Many of the cryptophyceae are known to populate greater depths than most other algal families, having developed a 99.5% efficient light-harvesting system. In this study, we used femtosecond time-resolved spectroscopy and global analysis to characterize the excited-state dynamics of PC645. Several different pump colors were selected to excite different fractions of the four phycobiliprotein pairs present in the complex. Measurements were also performed at cryogenic temperature to enhance spectral resolution and selectively promote downhill energy transfers. Upon excitation of the highest-energy bilins (dihydrobiliverdins), energy is transferred from the core of the complex to the periphery within 0.82 ps. Four bilins (mesobiliverdin (MBV) A/B and phycocyanobilins (PCB) 158C/D), which are responsible for the central band of the absorption spectrum, show concerted spectral dynamics. These chromophores show a biphasic decay with lifetimes of 0.6 ps (MBV) and 5-7 ps (PCB 158) to the lowest bilin pair (PCB 82C/D) absorbing around 650-657 nm. Within this lifetime of several picoseconds, the excitations reach the PCB 82 bilins on the two poles at the smaller sides of PC645. A slow 44-46 ps energy transfer step to the lowest-energy PCB 82 bilin concludes the dynamics.
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