Genus Obesumbacterium
Taxonomy
Morphology
Growth conditions
Biochemical characters
Ecology
Pathogenicity
References
Proteobacteria => Gammaproteobacteria => Enterobacteriales => Enterobacteriaceae => Obesumbacterium => Obesumbacterium
proteus (Flavobacterium proteus) - type species of the genus, Shimwell 1963.

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.
Gram negative, short, pleomorphic large rods.  Colonies are smooth, 2-5 mm diameter.
Facultatively anaerobic, growth temperature 30 - 37 °C, cannot survive below pH 3.9.
Nutrient agar or nutrient broth;
Trypticase Soy Agar ± 5% sheep blood.
Isolated from brewery fermentors, rarely isolated from nature (water, soil and plants).
Unknown clinical significance. Is a common contaminant of brewing yeasts causing wort spoilage & undesirable odour due to
dimethyl sulfide production.
  1. Bergey’s Manual of Determinative Bacteriology, 9th ed., 1994;
  2. Shimwell J.L.: Obesumbacterium gen. nov., Brewers Journal, 1963, 99, 759-760;
  3. 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.
See table at the end.
(c) Costin Stoica

 

Pigment

Catalase

Oxidase

Lactose

ONPG

Arginine dihydrolase

Lysine decarboxylase

Ornithine decarboxylase

Obesumbacterium proteus

-

+

-

-

-

-

+

+

 

Indole production

Citrate utilization

Hydrogen sulfide

Urea hydrolysis

Voges-Proskauer

Phenilalanine

Motility

Gelatinase

Growth on KCN media

Malonate

-

-

-

-

-

-

-

-

-

-

 

Glucose

Gas from glucose

D-Mannitol

Inositol

D-Sorbitol

L-Rhamnose

Sucrose (Sacharose)

Melibiose

L-Arabinose

Nitrate reduction

+

-

-

-

-

[-]

-

-

-

+

 

Cellobiose

Dulcitol

Glycerol

Maltose

D-Mannose

Alfa-Methyl-D-Glucoside

Raffinose

Salicin

Trehalose

D-Xylose

-

-

-

=

[+]

-

-

-

[+]

[-]

 

Mucate

Tartrate (Jordans)

Esculin hydrolysis

Acetate utilization

Deoxyribonuclease

Lipase

Mehyl red

D-Adonitol

-

[-]

-

-

-

-

[-]

-
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