Genus Obesumbacterium
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae, Genus
Obesumbacterium,
Obesumbacterium proteus  - type species of the genus, Shimwell 1963. Old synonym: Flavobacterium proteum  
Shimwell and Grimes 1936.
Based on PCR tests
O. proteus can be subdivided into two biogroups, biogroup 1, which has considerable biochemical and  genetic
homology to Hafnia alvei (now considered H. alvei metabolically inactive), and biogroup 2, which is relatively heterogeneous.
Obesumbacterium proteus biogroup 1 may be a synonym of Hafnia alvei hybridization group 1.
Obesumbacterium proteus biogroup 2 is a synonym of Shimwellia pseudoproteus Priest and Barker 2010.
Gram-negative, short, pleomorphic large rods.
Colonies are smooth, 2-5 mm diameter. Facultatively anaerobic, growth temperature
30 - 37 ºC, cannot survive below pH 3.9. Media: Nutrient agar or nutrient broth;
Trypticase Soy Agar ± 5% sheep blood.
Isolated from brewery fermentors, rarely isolated from nature (water, soil and plants).
Is a common contaminant of brewing yeasts causing wort spoilage & undesirable odour due to dimethyl sulfide production. Unknown
clinical significance.
  1. J. G.Holt et al., 1994. Begey’s manual of Determinative Bacteriology, 9th-edition, Williams & Wilkins.
  2. Andrew G. Prest, John R. M. Hammond, and Gordon S. A. B. Stewart: Biochemical and Molecular Characterization of
    Obesumbacterium proteus, a Common Contaminant of Brewing Yeasts, Appl Environ Microbiol. 1994 May; 60(5): 1635–1640.
  3. Fergus G. Priest andMargaret Barker. Gram-negative bacteria associated with brewery yeasts: reclassification of
    Obesumbacterium proteus biogroup 2 as Shimwellia pseudoproteus gen. nov., sp. nov., and transfer of Escherichia blattae to
    Shimwellia blattae comb. nov. Int J Syst Evol Microbiol April 2010 60:828-833.
  4. Don J. Brenner and J.J. Farmer III, 2001. Family I. Enterobacteriaceae. In:  Bergey’s Manual of Systematic Bacteriology, Second
    edition,Vol two, part B, George M. Garrity (Editor-in-Chief), pp 587-897.
  5. Geert Huys, Margo Cnockaert, Sharon L. Abbott, J. Michael Janda, and Peter Vandamme. Hafnia paralvei sp. nov., formerly known
    as Hafnia alvei hybridization group 2. Int J Syst Evol Microbiol August 2010 60:1725-1728.
See genera Hafnia & Shimwellia descriptions.
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