Rhodobacter sphaeroides, lipid

Fig. 8.—Chemical structure of lipid A of Rhodobacter sphaeroides (87,88,164). For details see the text and the legend to Fig. 6.

Fig. I. Arrangement of the chromophores, electron donors, and electron acceptors in the bacterial reaction center of Rhodobacter sphaeroides [2f], The horizontal lines at the top and bottom of the figure represent the approximate location of the surfaces of the lipid bilayer membrane...

The importance of lipids in bioconcentration is emphasized several times in this chapter, and various devices have been explored to take this into account. Experiments using liposomes prepared with L-a-dipalmitoyl and L-a-dio-leylphosphatidylcholine, and membranes prepared from Rhodobacter sphaeroides were therefore studied in an attempt to produce more realistic models of the lipid phase in partition experiments (Escher and Schwartzen-bach 1996). The system was evaluated using a number of phenols of varying pKa and log Kow values, and it was shown that both systems provided good models for all species of phenolic compounds. An extremely important observation that has wide implications for ecotoxicology emerged not only the neutral phenols partitioned into the liposomes but also the anionic species. 

Eichenberger W, Boschetti A and Michel HP (1986) Lipid and pigment composition of a chlorophyll h-deficient mutant of Chlamydomonas reinhardttii. Physiol Plant 66 589-594 Ermler U, Fritzsch G, Buchanan SK and Michel H (1994) Structure of the photosynthetic reaction centre from Rhodobacter sphaeroides at 2,65 A resolution Cofactors and protein-cofactor interactions. Structure 2 925-936 Foidl M, Golecki JR and Oelze J (1997) Phototrophic growth and chlorosome formation in Chloroflexus aurantiacus under conditions of carotenoid deficiency. Photosynth Res 54 219-226... 

Munge B, Pendon Z, Frank HA et al. Electrochemical reactions of redox cofoctors in Rhodobacter sphaeroides reaction center proteins in lipid films. Bioelectrochem 2001 54 145-150. 

Figure 8.24. Rhodobacter sphaeroides Complex IV cytochrome c oxidase. Stereo view in backbone representation of subunits I and II showing the greater permeation of water through the region of the lipid layer of Complex IV than for that of Complex III in Figure 8.20. (A) Heme redox centers at the heart of...

BIOSYNTHESIS OF DIACYLGLYCERYL-7V,7V,7V,-TRIMETHYLHOMOSERINE (DGTS) IN RHODOBACTER SPHAEROIDES Am) EVIDENCE FOR LIPID-LINKED A-METHYLATION... 

Benning, C., Z.H. Huang, D.A. Gage, and C.R. Somerville. 1995. Accumulation of a novel glycolipid and a betaine lipid in cells of Rhodobacter sphaeroides grown under phosphate limitation. Arch. Biochem. Biophys. 327.T03-111. 

Biosynthesis of Diacylglyceryl-N,N,N-Trimethylhomoserine (DOTS) in Rhodobacter sphaeroides and Evidence for Lipid-Linked N-Methylation. 

---