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Applied and Environmental Microbiology, February 1999, p. 578-584, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Hydrolysis of Pork Muscle Sarcoplasmic Proteins by
Lactobacillus curvatus and Lactobacillus
sake
Silvina
Fadda,1
Yolanda
Sanz,1
Graciela
Vignolo,2
M.-Concepción
Aristoy,1
Guillermo
Oliver,2 and
Fidel
Toldrá1,*
Instituto de Agroquímica y
Tecnología de Alimentos (CSIC), 46100 Burjassot (Valencia),
Spain,1 and
Centro de Referencia
para Lactobacilos (CERELA), 4000 San Miguel de Tucumán,
Argentina2
Received 27 May 1998/Accepted 9 November 1998
Lactobacillus curvatus CECT 904 and Lactobacillus
sake CECT 4808 were selected on the basis of their proteolytic
activities against synthetic substrates. Further, the effects of whole
cells, cell extracts, and a combination of both enzymatic sources on muscle sarcoplasmic proteins were determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and reverse-phase
high-performance liquid chromatography analyses. Strains of both
species displayed proteinase activities on five sarcoplasmic proteins.
The inoculation of whole cells caused a degradation of peptides,
whereas the addition of cell extracts resulted in the generation of
both hydrophilic and hydrophobic peptides. This phenomenon was
remarkably more pronounced when L. curvatus was involved.
Whole cells also consumed a great amount of free amino acids, while the
addition of intracellular enzymes contributed to their generation.
L. sake accounted for a greater release of free amino
acids. In general, cell viability and also proteolytic events were
promoted when cell suspensions were provided with cell extracts as an
extra source of enzymes.
*
Corresponding author. Mailing address: Instituto de
Agroquímica y Tecnología de Alimentos (CSIC), Apt. 73, 46100 Burjassot (Valencia), Spain. Phone: 34 96 3900022. Fax: 34 96 3636301. E-mail: ftoldra{at}iata.csic.es.
Applied and Environmental Microbiology, February 1999, p. 578-584, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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