Lactobacillus ultunensis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
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Pathogenicity
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Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Lactobacillaceae, Genus Lactobacillus, [Group A lactobacilli
(obligately homofermentative),
Lactobacillus delbrueckii phylogenetic-group] , Lactobacillus ultunensis  Roos, Engstrand and
Jonsson 2005.
Gram-positive rods (1.0 x 2.0-30 μm) occurring singly, in pairs and in filaments.
Nonspore-forming. Nonmotile.
After anaerobic growth at 37 ºC for 48 hours, colonies on MRS agar are 2-3 mm in
diameter, white, irregular and have a dry appearance; growth on MRS agar under
aerobic conditions is very weak. Anaerobic. Can grow at 25-42 ºC; not at 20 or 45 ºC.
Isolated from a biopsy of the healthy human gastric mucosa.
Undetermined.
  1. Hammes W.P. and Hertel C., 2009. Genus I. Lactobacillus  Beijerinck 1901. In: (Eds.) P.D. Vos, G. Garrity, D. Jones, N.R. Krieg, W.
    Ludwig, F.A. Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3: The Firmicutes,
    Springer, 465-511.
  2. Roos S., Engstrand L. and Jonsson H., 2005. Lactobacillus gastricus sp. nov., Lactobacillus antri sp. nov., Lactobacillus
    kalixensis sp. nov. and Lactobacillus ultunensis sp. nov., isolated from human stomach mucosa. IJSEM 55, 77-82.
Obligately homofermentative.

Positive results for aesculin hydrolysys, fermentation of: N-acetylglucosamine, arbutin, cellobiose, fructose,
beta-gentiobiose,
galactose, glucose (acid without gas production), lactose, maltose, mannose, salicin, sucrose, and trehalose.

Negative results for catalase, fermentation of: adonitol, amygdalin, arabinose, arabitol, dulcitol, erythritol, fucose, gluconate, 2- or
5-ketogluconate, glycerol, glycogen, inositol, inulin, lyxose, mannitol, melezitose, rhamnose, ribose, sorbitol, sorbose, tagatose,
turanose, xylitol, and xylose.

Variable results for melibiose (weak), raffinose, and starch fermentation.
(c) Costin Stoica
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