Abstract
The polyamine pool of 50 Gram-negative, aerobic species belonging to the class Proteobacteria (Stackebrandt et al., 1988), formerly “purple bacteria and relatives” (Woese et al., 1985b; Woese, 1987) was analyzed by high performance liquid chromatography (HPLC) in order to evaluate polyamines as a chemotaxonomic marker within this class. The unusual polyamine 2-hydroxyputrescine emerged as the ubiquitous component of absolute specificity within the beta subclass of Proteobacteria. The species of the alpha subclass had a triamine as the characteristic component, e. g., spermidine in the alpha-3 subclass and sym-homospermidine in the alpha-2 subclass. In fluorescent pseudomonads belonging to the gamma subclass, where genus-specificity of polyamine patterns is emerging, putrescine and spermidine were found as the main components.
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