title: Influence of growth conditions on the production of extracellular proteolytic enzymes in Paenibacillus peoriae NRRL BD-62 and Paenibacillus polymyxa SCE2.
abstract: OBJECTIVE
  To analyse the extracellular protease profile of two Paenibacillus species, Paenibacillus peoriae and Paenibacillus polymyxa, as well as how different growth media influenced its expression.
  
  
  RESULTS
  Both bacteria were cultured in five media [Luria-Bertani broth, glucose broth, thiamine/biotin/nitrogen broth (TBN), trypticase soy broth and a defined medium] for 48 h at 32 degrees C. Our results showed a heterogeneous protease secretion pattern whose expression was dependent on medium composition. However, TBN induced the most quantitative and qualitative protease production on both Paenibacillus. The proteases were detected in neutral-alkaline pH range, being totally inhibited by 1,10-phenanthroline, a zinc-metalloprotease inhibitor. We also analysed the protease expression during the growth and, at least to P. peoriae, the most elevated protease activity was measured at 96 h, in which the highest number of spores and a low concentration of viable cells were observed.
  
  
  CONCLUSIONS
  The results presented add P. peoriae and P. polymyxa to the list of neutral-alkaline extracellular protease producers.
  
  
  CONCLUSIONS
  Paenibacillus species are ubiquitous in nature, are capable to form resistant spores and to produce several hydrolytic enzymes, including proteases. However, only few data concerning the production of these enzymes are available. Proteases produced by Paenibacillus strains may represent new sources for biotechnological use.
authors.affiliation: Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes (IMPPG), Centro de Ciências da Saúde (CCS), Universidade Federal do Rio de Janeiro (UFRJ), Ilha do Fundão, Rio de Janeiro, Brazil.
authors.forename: V M
authors.initials: VM
authors.lastname: Alvarez
authors.forename: I
authors.initials: I
authors.lastname: von der Weid
authors.forename: L
authors.initials: L
authors.lastname: Seldin
authors.forename: A L S
authors.initials: AL
authors.lastname: Santos
mesh_terms: D001407:Bacillus / Q000201:enzymology* / Q000254:growth & development*; D003470:Culture Media; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D010447:Peptide Hydrolases / Q000378:metabolism*; D013696:Temperature
chemical_list: D003470:Culture Media; D004791:Enzyme Inhibitors; D010447:Peptide Hydrolases