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In-depth characterization of Lactobacillus delbrueckii subsp. lactis 313 for growth and cell-envelope-associated proteinase production

Paper ID Volume ID Publish Year Pages File Format Full-Text
3616 178 2012 8 PDF Available
Title
In-depth characterization of Lactobacillus delbrueckii subsp. lactis 313 for growth and cell-envelope-associated proteinase production
Abstract

The effect of process conditions on the growth and production of cell-envelope-associated proteinase (PrtL) by Lactobacillus delbrueckii subsp. lactis ATCC® 7830™ (LDL 313) was studied. Cell growth was profuse under the temperature conditions of 37 °C, 40 °C and 45 °C, with cell growth rates, μmax increasing with temperatures. Initial culture pH of 6 displayed the highest PrtL yield of 2.33 U. For each growth temperature the cell growth rates under anaerobic conditions were markedly higher than microaerophilic conditions, attributable to efficient sugar utilization under anaerobic fermentation. Overall, the proteolytic activities of cell-bound PrtL (bPrtL) were found to be higher than that of released PrtL (rPrtL). Higher rPrtL activities were displayed by anaerobic cultures over the entire fermentation period whereas the converse was true for bPrtL with microaerophilic cultures in the mid-late exponential phase displaying higher bPrtL activities than anaerobic cultures. Further, the proteinases had caseinolytic specificity for β-casein and κ-casein placing them in the cell-envelope-associated proteinases (CEPs) class I (CEPI) of the lactococcal CEPs grouping. This study provides insights into conditions for profuse growth and proteinase production by LDL 313 for subsequent technological applications in fermented foods, the dairy industry and bioactive peptide production.

► Anaerobic, rather than microaerophilic conditions, give high growth rate and cell biomass for Lactobacillus delbrueckii subsp. lactis 313 (LDL 313). ► Temperatures of 37–45 °C and initial pH of 6 to 7 are optimum for growth and cell-envelope-associated proteinase (CEP) production. ► CEP activity profiles for bound and released CEP differ for anaerobic and microaerophilic cultures. ► LDL 313 produces CEPI type proteinase.

Keywords
Process conditions; Microbial growth; Lactobacilli; Proteinase; Bioactive peptides
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In-depth characterization of Lactobacillus delbrueckii subsp. lactis 313 for growth and cell-envelope-associated proteinase production
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 64, 15 May 2012, Pages 61–68
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us