The molecular mechanisms of light adaption in light-harvesting complexes of purple bacteria revealed by a multiscale modeling.

ABSTRACT: The light-harvesting in photosynthetic purple bacteria can be tuned in response to the light conditions during cell growth. One of the used strategies is to change the energy of the excitons in the major fight-harvesting complex, commonly known as LH2. In the present study we report the first systematic investigation of the microscopic origin of the exciton tuning using three complexes, namely the common (high-light) and the low-light forms of LH2 from Rps. acidophila plus a third complex analogous to the PucD complex from Rps. palustris. The study is based on the combination of classical molecular dynamics of each complex in a lipid membrane and excitonic calculations based on a multiscale quantum mechanics/molecular mechanics approach including a polarizable embedding. From

SUBMITTER: Cardoso Ramos F 

PROVIDER: S-EPMC6988754 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature