Bacterial groups

C. R. Kuske, S. M. Bams, and J. D. Busch, Diverse uncultivated bacterial groups from soils of arid southwestern United States that are present in many geographic regions. Appl. Environ. Microbiol. 65 3614 (1997). 

Xu, M. Basile, F. Voorhees, K. J. Differentiation and classification of user-specified bacterial groups by in situ thermal hydrolysis and methylation of whole bacterial cells with tert-butyl bromide chemical ionization ion trap mass spectrometry. Anal. Chim. Acta 2000, 418,119-128. 

Gelsomino A, Cacco G (2006) Compositional shifts of bacterial groups in a solarized and amended soil as determined by denaturing gradient gel electrophoresis. Soil Biol Biochem 38 91-102. doi 10.1016/j.soilbio.2005.04.021... 

Because of their specificity for particular bacterial groups and environmental conditions, they make excellent biomarkers. Another steroidal biomarker is gammacerane (Figure 22.19b), which has six six-membered carbon rings. It is used as an indicator of water-column stratification in marine and lacustrine deposits. 

Bacterial group Type of photosynthesis Pigment in primary photoactivation Electron donors Products Carbon sources... 

Other studies showed that the glycosidic phosphate group of lipid A s is also substituted in Chromobacterium violaceum (by D-glucosamine, (22)), in Rhodospirilium tenue (by furanosidic D-arabinose, (30)) and, partially, in Escherichia coli (by phosphate, (36)). In a number of bacterial groups, however, the glycosidic phosphate appears to be unsubstituted (for literature see (8)). 

FIGURE 3 Distribution of bacterial groups implicated in the use of a variety of DOM components and size classes, a, (5, y, and 8 refer to subclasses of the Proteobacteria CFB indicates the Cytophaga-Flavobacter-Bacteriodes lineage NAG, N-acetylglucosamine. 

There is also growing evidence that the nature of DOM will affect microbial community structure and function. As we apply the new tools to identify microbial taxa in natural ecosystems, we can begin to delimit the relative importance of trophic and edaphic factors in influencing microbial community structure. The apparent two-way link between microbial community composition and DOM composition allows for further complexity in the dynamics of both DOM and bacterial groups. 

Rangan, P., Masquida, B., Westhof, E., and Woodson, S. A. (2003). Assembly of core helices and rapid tertiary folding of a small bacterial group I ribozyme. Proc. Natl. Acad. Sci. USA 100, 1574-1579. 

Perez-Salas, U. A., Rangan, P., et al. (2004). Compaction of a bacterial group I ribozyme coincides with the assembly of core helices. Biochemistry 43(6), 1746—1753. 

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