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© Michel-Robert Popoff
Clostridium difficile en microscopie à contraste de phase. On distingue des bactéries sporulées, non sporulées et d'autres en cours de lyse (destruction). Bactérie de l'environnement (sol, eau, foin, sable), elle est à l'origine d'infections nosocomiales survenant après un traitement antibiotique : Clostridium difficile prédomine alors que les autres bactéries de la flore intestinale ont été détruites. L'infection peut provoquer deux types de pathologies graves : les colites pseudo-membraneuses dont l'origine est quasiment due à 100 % à C. difficile et la diarrhée post-antibiothérapie due à C. difficile dans 30 % des cas de ces diarrhées.
Publication : Molecular & general genetics : MGG

Characterization of the levanase gene of Bacillus subtilis which shows homology to yeast invertase

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular & general genetics : MGG - 01 Jun 1987

Martin I, Débarbouillé M, Ferrari E, Klier A, Rapoport G

Link to Pubmed [PMID] – 3112519

Mol. Gen. Genet. 1987 Jun;208(1-2):177-84

The structural gene for the enzyme levanase of Bacillus subtilis (SacC) was cloned in Escherichia coli. The cloned gene was mapped by PBS1 transduction near the sacL locus on the B. subtilis chromosome, between leuA and aroD. Expression of the enzyme was demonstrated both in B. subtilis and in E. coli. The presence of sacC allowed E. coli to grow on sucrose as the sole carbon source. The complete nucleotide sequence of sacC was determined. It includes an open reading frame of 2,031 bp, coding for a protein with calculated molecular weight of 75,866 Da, including a putative signal peptide similar to precursors of secreted proteins found in Bacilli. The apparent molecular weight of purified levanase is 73 kDa. The sacC gene product was characterized in an in vitro system and in a minicell-producing strain of E. coli, confirming the existence of a precursor form of levanase of about 75 kDa. Comparison of the predicted aminoacid sequence of levanase with those of the two other known beta-D-fructofuranosidases of B. subtilis indicated a homology with sucrase, but not with levansucrase. A stronger homology was detected with the N-terminal region of yeast invertase, suggesting the existence of a common ancestor.