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

ABSTRACT: 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 molecu

SUBMITTER: Zucchelli G 

PROVIDER: S-EPMC1959541 | biostudies-literature | 2007 Sep

REPOSITORIES: biostudies-literature