Identification of the upper exciton component of the B850 bacteriochlorophylls of the LH2 antenna complex, using a B800-free mutant of Rhodobacter sphaeroides

Biochemistry
M H KoolhausRienk van Grondelle

Abstract

In this paper, we report the circular dichroism (CD) spectra of two types of LH2-only mutants of Rhodobacter sphaeroides. In the first, only the wild type LH2 is present, while i the second, the B800 binding site of LH2 has been either destabilized or removed. For the first time, we have identified a band in the CD spectrum of LH2, located at approximately 780 nm, that can be ascribed to the high exciton component of the B850 band. The experimental spectra have been modeled by theoretical calculations. On this basis, the average interaction strength between the monomers in the B850 ring can be estimated to be approximately 300 cm-1. In addition, we suggest that in LH2 of Rb. sphaeroides the angles made by the Qy transitions of the B850 BChls with respect to the plane of the ring are slightly different from those calculated from the crystal structure of the Rhodopseudomonas acidophila LH2 complex.

References

Nov 5, 1997·Current Opinion in Structural Biology·G R Fleming, R van Grondelle

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Citations

Sep 24, 2011·Nature Chemistry·Gregory D ScholesRienk van Grondelle
Dec 29, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·R J CogdellW Lubitz
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Feb 18, 2006·The Journal of Biological Chemistry·Adela Garcia-MartinPaula Braun

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