Excitation delocalization in the bacteriochlorophyll c antenna of the green bacterium Chloroflexus aurantiacus as revealed by ultrafast pump-probe spectroscopy

FEBS Lett. 1998 Jul 3;430(3):323-6. doi: 10.1016/s0014-5793(98)00691-7.

Abstract

Room temperature absorption difference spectra were measured on the femtosecond through picosecond time scales for chlorosomes isolated from the green bacterium Chloroflexus aurantiacus. Anomalously high values of photoinduced absorption changes were revealed in the BChl c Qy transition band. Photoinduced absorption changes at the bleaching peak in the BChl c band were found to be 7-8 times greater than those at the bleaching peak in the BChl a band of the chlorosome. This appears to be the first direct experimental proof of excitation delocalization over many BChl c antenna molecules in the chlorosome.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Bacterial Proteins / chemistry*
  • Bacteriochlorophylls / chemistry*
  • Chlorobi / chemistry*
  • Energy Transfer
  • Lasers
  • Organelles
  • Spectrum Analysis / methods*

Substances

  • Bacterial Proteins
  • Bacteriochlorophylls
  • bacteriochlorophyll c