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Temperature dependence of excitation transfer in LH2 of Rhodobacter sphaeroides

Pullerits, Tõnu LU ; Hess, Susan LU ; Herek, Jennifer L. LU and Sundström, Villy LU (1997) In Journal of Physical Chemistry B 101(49). p.10560-10567
Abstract
Using two-color pump−probe femtosecond spectroscopy, the temperature
dependence of the energy transfer rate within the peripheral
light-harvesting antenna (LH2) of the photosynthetic bacterium Rhodobacter sphaeroides has
been measured. The energy transfer time from B800 to B850 is determined
to be 0.7, 1.2, and 1.5 ps at 300, 77, and 4.2 K, respectively. These
data, combined with earlier results, have been analyzed with regard to
the crystal structure and spectroscopic properties of the purple
bacterial LH2 complex. We conclude that the transfer within B800 occurs
mainly via the incoherent Förster hopping mechanism. For B800 to B850
transfer, estimates based on the Förster formula yield... (More)
Using two-color pump−probe femtosecond spectroscopy, the temperature
dependence of the energy transfer rate within the peripheral
light-harvesting antenna (LH2) of the photosynthetic bacterium Rhodobacter sphaeroides has
been measured. The energy transfer time from B800 to B850 is determined
to be 0.7, 1.2, and 1.5 ps at 300, 77, and 4.2 K, respectively. These
data, combined with earlier results, have been analyzed with regard to
the crystal structure and spectroscopic properties of the purple
bacterial LH2 complex. We conclude that the transfer within B800 occurs
mainly via the incoherent Förster hopping mechanism. For B800 to B850
transfer, estimates based on the Förster formula yield considerably
slower transfer times than experimentally observed, suggesting that an
additional mechanism may be involved in enhancing the transfer rate. We
suggest two possibilities:  transfer via the upper excitonic component
of B850 band and/or transfer mediated by a carotenoid molecule. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry B
volume
101
issue
49
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:0031553294
ISSN
1520-6106
DOI
10.1021/jp9720956
language
English
LU publication?
yes
id
a73c1d17-f377-419a-8f15-c50d95515591
date added to LUP
2025-10-28 17:11:13
date last changed
2025-10-31 11:35:33
@article{a73c1d17-f377-419a-8f15-c50d95515591,
  abstract     = {{Using two-color pump−probe femtosecond spectroscopy, the temperature <br>
dependence of the energy transfer rate within the peripheral <br>
light-harvesting antenna (LH2) of the photosynthetic bacterium <i>Rhodobacter sphaeroides </i>has<br>
 been measured. The energy transfer time from B800 to B850 is determined<br>
 to be 0.7, 1.2, and 1.5 ps at 300, 77, and 4.2 K, respectively. These <br>
data, combined with earlier results, have been analyzed with regard to <br>
the crystal structure and spectroscopic properties of the purple <br>
bacterial LH2 complex. We conclude that the transfer within B800 occurs <br>
mainly via the incoherent Förster hopping mechanism. For B800 to B850 <br>
transfer, estimates based on the Förster formula yield considerably <br>
slower transfer times than experimentally observed, suggesting that an <br>
additional mechanism may be involved in enhancing the transfer rate. We <br>
suggest two possibilities:  transfer via the upper excitonic component <br>
of B850 band and/or transfer mediated by a carotenoid molecule.}},
  author       = {{Pullerits, Tõnu and Hess, Susan and Herek, Jennifer L. and Sundström, Villy}},
  issn         = {{1520-6106}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{49}},
  pages        = {{10560--10567}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry B}},
  title        = {{Temperature dependence of excitation transfer in LH2 of <i>Rhodobacter sphaeroides</i>}},
  url          = {{http://dx.doi.org/10.1021/jp9720956}},
  doi          = {{10.1021/jp9720956}},
  volume       = {{101}},
  year         = {{1997}},
}