Photoreaction center of photosynthetic bacteria. 2. Size and quaternary structure of the photoreaction centers from Rhodospirillum rubrum strain G9 and from Rhodopseudomonas sphaeroides strain 2.4.1

Biochemistry ◽  
1979 ◽  
Vol 18 (20) ◽  
pp. 4308-4314 ◽  
Author(s):  
Christian Vadeboncoeur ◽  
Margaret Mamet-Bratley ◽  
Gabriel Gingras
Keyword(s):  
Photosynthetic Bacteria ◽  
Rhodospirillum Rubrum ◽  
Quaternary Structure ◽  
Rhodopseudomonas Sphaeroides

scholarly journals Changes in the acyl lipid composition of photosynthetic bacteria grown under photosynthetic and non-photosynthetic conditions

1979 ◽  
Vol 181 (2) ◽  
pp. 339-345 ◽  
Author(s):  
Nicholas J. Russell ◽  
John L. Harwood
Keyword(s):  
Fatty Acids ◽  
Photosynthetic Bacteria ◽  
Rhodospirillum Rubrum ◽  
Relative Proportion ◽  
Photosynthetic Apparatus ◽  
Growth Conditions ◽  
Rhodopseudomonas Capsulata ◽  
Rhodopseudomonas Sphaeroides ◽  
Acyl Lipids ◽  
And Function

The acyl lipids and their constituent fatty acids were studied in the photosynthetic bacteria Rhodospirillum rubrum, Rhodopseudomonas capsulata and Rhodopseudomonas sphaeroides, which were grown under photosynthetic and non-photosynthetic conditions. The major lipids were found to be phosphatidylethanolamine, phosphatidylglycerol and cardiolipin in each bacterium. The two Rhodopseudomonas species also contained significant quantities of phosphatidylcholine. Other acyl lipids accounted for less than 10% of the total. On changing growth conditions from non-photosynthetic to photosynthetic a large increase in the relative proportion of phosphatidylglycerol was seen at the expense of phosphatidyl-ethanolamine. In Rhodospirillum rubrum the fatty acids of the major phospholipids showed an increase in the proportion of palmitate and stearate and a decrease in palmitoleate and vaccenate on changing growth conditions to photosynthetic. In contrast, the exceptionally high levels (>80%) of vaccenate in individual phospholipids of Rhodopseudomonas capsulata and Rhodopseudomonas sphaeroides were unaffected by changing growth conditions to photosynthetic. Analysis of the lipids of chromatophores, isolated from the three bacteria, showed that these preparations were enriched in phosphatidylglycerol. The large increase in this phospholipid, seen during growth under photosynthetic conditions, appeared, therefore, to be due to a proliferation of chromatophore membranes. Possible roles for acyl lipids in the formation and function of the photosynthetic apparatus of bacteria are discussed.

Energy transfer in photosynthetic bacteria as examined by photoacoustic spectroscopy

1983 ◽  
Vol 61 (10) ◽  
pp. 1117-1122 ◽  
Author(s):  
François Boucher ◽  
Lysanne Lavoie ◽  
Adel F. Antippa ◽  
Roger M. Leblanc
Keyword(s):  
Energy Transfer ◽  
Energy Storage ◽  
Photoacoustic Spectroscopy ◽  
Photosynthetic Bacteria ◽  
Rhodospirillum Rubrum ◽  
Rhodopseudomonas Sphaeroides ◽  
Simple Method ◽  
Photoacoustic Spectra

Antenna carotenoids are investigated by photoacoustic spectroscopy in the photosynthetic bacteria Rhodospirillum rubrum and Rhodopseudomonas sphaeroides. Energy storage in these organisms is revealed by the photoacoustic spectra. A simple method is proposed to evaluate the efficiency of energy transfer between carotenoids and bacteriochlorophyll.

scholarly journals Alternative pathways of spirilloxanthin biosynthesis in Rhodospirillum rubrum

1970 ◽  
Vol 116 (1) ◽  
pp. 101-110 ◽  
Author(s):  
B. H. Davies
Keyword(s):  
Photosynthetic Bacteria ◽  
Rhodospirillum Rubrum ◽  
Carotenoid Biosynthesis ◽  
Alternative Pathways ◽  
Alternative Routes ◽  
Novel Structures

Detailed studies of the properties of carotenoids isolated from diphenylamine-inhibited cultures of Rhodospirillum rubrum have revealed a number of novel structures that indicate new features of carotenoid biosynthesis in the photosynthetic bacteria. Both neurosporene and 7,8,11,12-tetrahydrolycopene undergo hydration, methylation and dehydrogenation to yield spheroidene and 11′,12′-dihydrospheroidene respectively; all the intermediates in these pathways have been identified. These pathways represent alternative routes of anhydrorhodovibrin and spirilloxanthin biosynthesis.

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