The two light-harvesting membrane chromoproteins of Thermochromatium tepidum expose distinct robustness against temperature and pressure.
Biochim Biophys Acta Bioenerg
; 1861(8): 148205, 2020 08 01.
Article
em En
| MEDLINE
| ID: mdl-32305413
ABSTRACT
An increased robustness against high temperature and the much red-shifted near-infrared absorption spectrum of excitons in the LH1-RC core pigment-protein complex from the thermophilic photosynthetic purple sulfur bacterium Thermochromatium tepidum has recently attracted much interest. In the present work, thermal and hydrostatic pressure stability of the peripheral LH2 and core LH1-RC complexes from this bacterium were in parallel investigated by various optical spectroscopy techniques applied over a wide spectral range from far-ultraviolet to near-infrared. In contrast to expectations, very distinct robustness of the complexes was established, while the sturdiness of LH2 surpassed that of LH1-RC both with respect to temperatures between 288 and 360 K, and pressures between 1 bar and 14 kbar. Subtle structural variances related to the hydrogen bond network are likely responsible for the extra stability of LH2.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pressão
/
Temperatura
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Chromatiaceae
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Complexos de Proteínas Captadores de Luz
Idioma:
En
Revista:
Biochim Biophys Acta Bioenerg
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Estônia
País de publicação:
HOLANDA
/
HOLLAND
/
NETHERLANDS
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NL
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PAISES BAJOS
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THE NETHERLANDS