English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/3067
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título : Purification and characterization of an X-prolyl-dipeptidyl peptidase from Lactobacillus sakei
Autor : Sanz, Yolanda; Toldrá Vilardell, Fidel
Palabras clave : X-prolyl-dipeptidyl peptidase
Lactobacillus sakei
Fecha de publicación : abr-2001
Editor: American Society for Microbiology
Citación : Applied and Environmental Microbiology 67 (4) : 1815-1820 (2001)
Resumen: An X-prolyl-dipeptidyl peptidase has been purified from Lactobacillus sakei by ammonium sulfate fractionation and five chromatographic steps, which included hydrophobic interaction, anion-exchange chromatography, and gel filtration chromatography, This procedure resulted in a recovery yield of 7% and an increase in specificity of 737-fold. The enzyme appeared to be a dimer,vith a subunit molecular mass of approximately 88 kDa, Optimal activity was shown at pH 7.5 and 55 degreesC. The enzyme was inhibited by serine proteinase inhibitors and several divalent cations (Cu2+, Hg2+, and Zn2+). The enzyme almost exclusively hydrolyzed X-Pro from the N terminus of each peptide as well as fluorescent and colorimetric substrates; it also hydrolyzed X-Ala at the N terminus, albeit at lower rates. K-m s for Gly-Pro- and Lys-Ala-7-amido-4-methylcoumarin were 29 and 88 IJ M, respectively; those for Gly-Pro- and Ala-Pro-p-nitroanilide were 192 and 50 muM, respectively. Among peptides, beta -casomorphin 1-3 was hydrolyzed at the highest rates, while the relative hydrolysis of the other tested peptides was only 1 to 12%, The potential role of the purified enzyme in the proteolytic pathway by catalyzing the hydrolysis of peptide bonds involving proline is discussed.
URI : http://hdl.handle.net/10261/3067
Aparece en las colecciones: (IATA) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.