Entropy is an important design principle in the photosystem II supercomplex Article Swipe
Johanna Hall
,
Shiun-Jr Yang
,
David T. Limmer
,
Graham R. Fleming
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1073/pnas.2426331122
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1073/pnas.2426331122
Photosystem II (PSII) can achieve near-unity quantum efficiency of light harvesting in ideal conditions and can dissipate excess light energy as heat to prevent the formation of reactive oxygen species (ROS) under light stress. Understanding how this pigment–protein complex accomplishes these opposing goals is a topic of great interest that has so far been explored primarily through the lens of the system energetics. Despite PSII’s known flat energy landscape, a thorough consideration of the entropic effects on energy transfer in PSII is lacking. In this work, we aim to discern the free energetic design principles underlying the PSII energy transfer network. To accomplish this goal, we employ a structure-based rate matrix and compute the free energy terms in time following a specific initial excitation to discern how entropy and enthalpy drive ensemble system dynamics. We find that the interplay between the entropy and enthalpy components differ among each protein subunit, which allows each subunit to fulfill a unique role in the energy transfer network. This individuality ensures that PSII can accomplish efficient energy trapping in the reaction center (RC), effective nonphotochemical quenching (NPQ) in the periphery, and robust energy trapping in the other-monomer RC if the same-monomer RC is closed. We also show that entropy, in particular, is a dynamically tunable feature of the PSII free energy landscape accomplished through regulation of LHCII binding. These findings help rationalize natural photosynthesis and provide design principles for more efficient solar energy harvesting technologies.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1073/pnas.2426331122
- https://www.pnas.org/doi/pdf/10.1073/pnas.2426331122
- OA Status
- hybrid
- Cited By
- 2
- References
- 50
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4408612813
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Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4408612813Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1073/pnas.2426331122Digital Object Identifier
- Title
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Entropy is an important design principle in the photosystem II supercomplexWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-03-19Full publication date if available
- Authors
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Johanna Hall, Shiun-Jr Yang, David T. Limmer, Graham R. FlemingList of authors in order
- Landing page
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https://doi.org/10.1073/pnas.2426331122Publisher landing page
- PDF URL
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https://www.pnas.org/doi/pdf/10.1073/pnas.2426331122Direct link to full text PDF
- Open access
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://www.pnas.org/doi/pdf/10.1073/pnas.2426331122Direct OA link when available
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Photosystem II, Quenching (fluorescence), Entropy (arrow of time), Chemical physics, Chemistry, Energy landscape, Photosynthesis, Enthalpy, Thermodynamics, Biological system, Physics, Biology, Biochemistry, Quantum mechanics, FluorescenceTop concepts (fields/topics) attached by OpenAlex
- Cited by
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2Total citation count in OpenAlex
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2025: 2Per-year citation counts (last 5 years)
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50Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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