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Pressure effects on spectra of photosynthetic light-harvesting pigment-protein complexes

✍ Scribed by Arvi Freiberg; Aleksandr Ellervee; Peeter Kukk; Arlentin Laisaar; Märt Tars; Kõu Timpmann

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
625 KB
Volume
214
Category
Article
ISSN
0009-2614

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✦ Synopsis

The influence ofhigh (up to 9 kbar) hydrostatic pressure on the absorption and fluorescence emission spectra of photosynthetic light-harvesting pigment-protein complexes isolated from purple bacteria Rhuduspirillum rubrum has been studied at room temperature and at 77 K. Under pressure at room temperature all spectral bands exhibit a red-shift at a rate of between 30 and 120 cm-'/kbar for different bands. From these pressure shifts the compressibility of the protein matrix can be estimated. The com- pressibility is remarkably different for the protein surrounding bacteriochlorophyll a molecules ( KB 25 i 5 Mhar-' ) than for the one surrounding spimloxanthin molecules (ICC 10 k 2 Mhar-' ). This indicates that the elastic properties of a protein are locally specific.

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✍ K. Heremans; P.T.T. Wong 📂 Article 📅 1985 🏛 Elsevier Science 🌐 English ⚖ 271 KB

The &unan\_spectrum of prcssure-denalured lysozyme in aqueous solution is reported for uhe first time. only minor changes occur up to 3.6 kbar\_ At 5-5 kba\_r irreversible denaturation and precipitation occurs. The ~csults provide new intcrpretarions for other uperimenlal findings on pressure-induce