Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms.

Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Research Abstract Details 

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Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Abstract Text:

Giuseppe Zucchelli,Doriano Brogioli,Anna Paola Casazza,Flavio M Garlaschi,Robert C Jennings,

The possibility that the chlorophyll (chl) ring distortions observed in the crystal structures of chl-protein complexes are involved in the transition energy modulation, giving rise to the spectral forms, is investigated. The out-of-plane chl-macrocycle distortions are described using an orthonormal set of deformations, defined by the displacements along the six lowest-frequency, out-of-plane normal coordinates. The total chl-ring deformation is the linear combination of these six deformations. The two higher occupied and the two lower unoccupied chl molecular orbitals, which define the Q(y) electronic transition, have the same symmetry as four of the six out-of-plane lowest frequency modes. We assume that a deformation along the normal-coordinate having the same symmetry as a given molecular orbital will perturb that orbital and modify its energy. The changes in the chl Q(y) transition energies are evaluated in the Peridinin-Chl-Protein complex and in light harvesting complex II (LHCII), using crystallographic data. The macrocycle deformations induce a distribution of the chl Q(y) electronic energy transitions which, for LHCII, is broader for chla than for chlb. This provides the physical mechanism to explain the long-held view that the chla spectral forms in LHCII are both more numerous and cover a wider energy range than those of chlb.

Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Publishing Authors By Initials

G Zucchelli,D Brogioli,AP Casazza,FM Garlaschi,RC Jennings,

For similar natural sciences: physics: thermodynamics research abstracts see: natural sciences: physics: thermodynamics research

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Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Biophysical journal

VOLUME: 93

Page Numbers: 2240-54

Journal Abbreviation: Biophys. J.

ISSN: 0006-3495

DAY: 18

MONTH: 05

YEAR: 2007

Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Information

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LANGUAGE: eng

NlmUniqueID: 370626

Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Keywords Mesh Terms:

KEYWORDS: Thermodynamics

MESH TERMS: chemistry

Chemical & Substance for Abstract: Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms. Information

Substance Name: chlorophyll b

Registry Number: 519-62-0

Grant and Affiliation Information for Chlorophyll ring deformation modulates Qy electronic energy in chlorophyll-protein complexes and generates spectral forms.

AFFILIATION: Consiglio Nazionale Delle Ricerche-Istituto di Biofisica, Dipartimento di Biologia, Università degli Studi di Milano, Milan, Italy. giuseppe.zucchelli@unimi.it

Country: United States

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MEDLINETA: Biophys J

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