Green bacteria

Bacteriochlorophyll c 428, 660 Green sulfur bacteria Green -C2CH3-0H -CH3 -CH2CH3 -CH CH COO-farnesyl Single Single... 

Anoxygenic photosynthetic bacteria. Green sulfur bacteria. Chlorobium, Prosthecochloris purple nonsulfur bacteria Rhodopseudomonas, Rhodospirillum purple sulfur bacteria Chromatium, Thiospirillum... 

In studying the evolution of iron-sulfur proteins, the requirements of the ferredoxins for specifically placed cysteines to bind the irons in the active center have been most useful. Figure 6 shows sequences of the ferredoxins from several obligate fermenting anaerobic bacteria, green... 

Figure 10 In situ identification of microbial aggregates consisting of Archea (red) in the center and SO -reducing bacteria (green) on the periphery. Microorganisms were labeled with rRNA-targeted oligio-nucleotide probes, (source Boetius et al., 2000b).

A-9 Photoautotrophs - Photoautotrophs use light as an energy source and carbon dioxide as their main carbon source. They include photosynthetic bacteria (green sulfur bacteria, purple sulfur bacteria, and cyanobacteria), algae, and green plants. 

Green sulfur bacteria Green filamentous bacteria... 

The photosystems of green plants and photosynthetic bacteria appear to function with basically the same sort of mechanisms of energy transfer, primary charge separation, electron transfer, charge stabilization, but the molecular constituents of the reaction center are quite diflFerent. Photosystem I contains iron-sulphur proteins as electron acceptors so can be called iron-sulphur (FeS) type reaction center, while photosystem II contains pheophytin as the primary electron acceptor and quinone as the secondary acceptors so it can be called pheophytin-quinone (4>-Q) type . The reaction center of purple bacteria, green nonsulphur bacteria, and PSII are (4>-Q) type. Green sulphur bacteria, heliobacteria, and PSI have (FeS) type reaction centers. ... 

Fe-Fd from blue-green bacteria, green algae and higher plants are highly homologous (96 to 98 amino acid residues with 4-6 cysteines). Four of the six cysteines are found in all plant Fd in positions 39,44,47 and 77, and are covalently bound to the Fe-S center. A proposed model of 2Fe-Fd is shown in the Rg. to Iron-sulfur proteins (see). 2Fe-Fd serve as electron-transfer catalysts in both cyclic (1) and noncyclic photophosphorylation (2) ... 

V.B12 occurs predominantly in animal tissues and animal products. It is synthesized principally by bacteria. Green plants contain little or no V.B,2. Deficiency symptoms are sometimes observed in strict vegetarians, most often in breast-fed infants whose mothers consume no animal products. The body reserves of cobalamin are usually so large that an adult can survive for many years on them in the absence of a dietary intake. 

In contrast, eubacteria (including purple bacteria, green filamentous bacteria, and heliobacteria), archaea, and fungi use only one enzyme phytoene desaturase (CrtI) to convert phytoene 3 to lycopene 7. Exceptionally, the primitive cyanobacterium Gloeobacter violaceus PCC 7421 uses this CrtI [29, 30]. G. violaceus is the first oxygenic phototroph that has been shown to use this enzyme (Table 106.3), whereas green sulfur bacteria use CrtP, CrtQ, and CrtH [14, 31]. 

Bacteriochloro- phyll Bacterioviridin Purple sulfur bacteria Green sulfur bacteria Infra-red, blue-violet Red and blue-violet Exists in several forms... 

Purple sulfur bacteria Green sulfur bacteria Sulfate-reducing bacteria... 

Each of the two photosystems found in plants is found in a different color of bacteria. Green sulfur bacteria have photosystem 1, but purple bacteria have photosystem II. The two photosystems are chemically distinct, even using different elements. 

---