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StatusReference proteome
Proteome IDiUP000000439
Taxonomy206672 - Bifidobacterium longum (strain NCC 2705)
StrainNCC 2705
Last modifiedFebruary 27, 2018
Genome assembly and annotationi GCA_000007525.1 from ENA/EMBL
Pan proteomei This proteome is part of the Bifidobacterium longum (strain NCC 2705) pan proteome (fasta)

Bifidobacterium longum is an anaerobic, non-halophilic, Gram-positive bacterium that is commonly found in the intestines of humans and most animals and insects. They were first isolated and described over one hundred years ago from human feces and were quickly associated with a healthy gastrointestinal tract (GIT) due to their numerical dominance in breast fed infants compared to bottle fed infants. In the neonate their numerical advantage confers a substantial health benefit by hindering pathogen colonization through competitive exclusion. It is important for establishing and maintaining homeostasis of the intestinal ecosystem to allow for normal digestion. B. longum is characterized by a unique hexose metabolism that occurs via a phosphoketolase pathway often termed the bifid shunt. Fructose-6-phosphate phosphoketolase (F6PPK) is a key enzyme of the bifid shunt and its presence is the most common diagnostic test for this genus, as it is not present in other Gram-positive intestinal bacteria. B. longum is often the dominant species detected in humans and is the only species to regularly harbor plasmids. It is a leading member of the probiotic bacteria due to numerous studies that have provided a growing body of evidence for its role in a myriad of potential health benefits. These include diarrhea prevention in antibiotic treated patients, cholesterol reduction, alleviation of lactose intolerance symptoms, immune stimulation and cancer prevention. The stabilizing effect on GIT microflora is attributed to the capacity of bifidobacterium to produce bacteriocins, which are bacteriostatic agents with a broad spectrum of action, and to their pH-reducing activity. Selection of suitable strains for probiotic purposes is very difficult as inherent characteristics of strains of B. longum that are necessary for its survival and competition in the human large intestine are currently very poorly understood. The use of the sequenced genome in microarray analysis reveals pertinent traits that are important to attain dominance in these complex ecosystems.


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Component nameGenome Accession(s)
Plasmid pBLO12


  1. "The genome sequence of Bifidobacterium longum reflects its adaptation to the human gastrointestinal tract."
    Schell M.A., Karmirantzou M., Snel B., Vilanova D., Berger B., Pessi G., Zwahlen M.-C., Desiere F., Bork P., Delley M., Pridmore R.D., Arigoni F.
    Proc. Natl. Acad. Sci. U.S.A. 2002:14422-14427(2002) [PubMed] [Europe PMC] [Abstract]

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