Prevotellaceae
Prevotellaceae is a family of bacteria. The type genus Prevotella is named in honor of the French microbiologist André Prévot -Romain ( 1894-1982 ).
Appearance
The Gram test is negative. The cells are rod-shaped, such as for some types of Prevotella. The species Prevotella oryzae forms filamentous rods with a length of 20-50 microns.
Growth and metabolism
All members of the Porphyromonadaceae are chemo- organotroph. The metabolic pathway is the fermentation. The species are anaerobic. The species Prevotella oryzae, previously managed as Xylanibacter oryzae, is xylanolytisch, they can ferment the polysaccharide xylan. Other types of Prevotella are saccharolytic, they ferment various carbohydrates. Weak to moderately saccharolytic is also Alloprevotella rava.
Occurrence
The respective species inhabit very different habitats. So types of Prevotella were, inter alia, found in the oral cavity of the human and in the intestinal tract of animals. The type Alloprevotella rava was also isolated from the oral cavity of man .. Prevotella oryzae was isolated from rice plants. Paraprevotella clara and P. xylaniphila were found in human feces.
Prevotella in the intestine may be associated with the occurrence of rheumatism.
System
The Prevotellaceae family will be provided to the order Bacteroidales in the Department of Bacteroidetes. The four genera are known:
- Alloprevotella Downes et al. 2013
- Hall Ella Moore and Moore 1994
- Paraprevotella Morotomi et al. 2009
- Prevotella Shah and Collins 1990 emend. Sakamoto and Ohkuma 2012
The taxonomy of the genus Hall Ella is still under discussion, the only one known to date Art Hall Ella seregens to be of the genus Prevotella belonging. The type Xylanibacter oryzae (the only member of the genus Xylanibacter ) was in 2012 to the genus Prevotella asked ( now so oryzae as Prevotella ( Ueki et al. 2006) Sakamoto and Ohkuma 2012 out ). Also, some Bacteroides species were assigned to the genus Prevotella 1990, denticola eg Bacteroides oralis as Prevotella oralis and Bacteroides denticola as Prevotella.