On Excitation Energy Transfer within the Baseplate BChl a–CsmA Complex of Chloroflexus aurantiacus

• DOI: 10.1021/acs.jpcb.9b08043
• Publication Date: 2019-10-29T13:48:19Z
• Authors: Mahboobe Jassas; Carrie Goodson; Robert E. Blanken...; Ryszard Jankowiak; Adam Kell
• Keywords: Chlorosome

Recently, a hybrid approach combining solid-state NMR spectroscopy and cryo-electron microscopy showed that the baseplate in green sulfur bacterium Chlorobaculum tepidum is 2D lattice of BChl a–CsmA dimers [Nielsen, J. T.; et al., Nat. Commun. 2016, 7, 12454–12465]. While existence subunit was previously known, proposed orientations pigments had only been elucidated from spectral data up to this point. Regarding electronic structure baseplate, two models have proposed. were interpreted as revealing at least four excitonically coupled might be close contact. Conversely, hole burning suggested lowest energy state localized, yet additional states are sometimes observed because presence Fenna–Matthews–Olson (FMO) antenna protein. To solve conundrum, work studies chlorosome–baseplate complex Chloroflexus aurantiacus, which does not contain FMO The results confirm both C. excitation transferred localized low-energy trap near 818 nm with similar rates, most likely via exciton hopping.