Pro' te.us
. Gr. n.
Proteus
an ocean god able to change himself into different shapes.
Proteobacteria / Gammaproteobacteria / Enterobacteriales / Enterobacteriaceae / Proteus
Straight rods, 0.4–0.8 × 1.0–3.0 μm
. Gram negative.
Motile
by peritrichous flagella.
Most strains swarm with periodic cycles of migration producing concentric zones, or spread in a uniform film, over moist surfaces solidified with agar or gelatin
. The organisms in this genus conform to the definition of the family
Enterobacteriaceae
.
They are facultatively anaerobic, chemoorganotrophic, having both a respiratory and a fermentative type of metabolism
. Optimal growth temperature is 37°C.
Oxidase negative; catalase positive. Methyl red positive; species vary in indole production, Voges–Proskauer, and Simmons citrate tests. They oxidatively deaminate phenylalanine and tryptophan. Urea is hydrolyzed. Lysine decarboxylase negative and arginine dihydrolase negative; only
Proteus mirabilis
decarboxylates ornithine. All but
Proteus myxofaciens
decompose tyrosine to produce a clearing on agar media in which the insoluble amino acid is incorporated. Grow on KCN. H
2
S is usually produced. Malonate is not utilized
.
D
‐glucose and a few other carbohydrates are catabolized with production of acid and usually gas. Does not produce acid from inositol or from straight chain tetra‐, penta‐, or hexahydroxy—alcohols, but generally produces acid from glycerol. One or more species ferment maltose, sucrose, trehalose, and
D
‐xylose. Human pathogens, causing urinary tract infections; also are secondary invaders, causing septic lesions at other sites of the body. Occurs in the intestines of humans and a wide variety of animals; also occurs in manure, soil, and polluted waters.
P. myxofaciens
has been isolated only from gypsy moth larvae. Based on 16S rDNA sequence analysis,
Proteus
belongs to the family
Enterobacteriaceae
within the
Proteobacteria
(Woese et al., 1985; Niebel et al., 1987; Stackebrandt et al., 1988).
The mol
%
G
+
C of the DNA is
: 38–41 (Falkow et al., 1962).
Type species
:
Proteus vulgaris
Hauser 1885, 12 emend. Brenner, Hickman‐Brenner, Holmes, Hawkey, Penner, Grimont and O'Hara 1995, 870.