Cited by 143Enzyme Production and CharacterizationProbiotics and Fermented FoodsBacterial Genetics and Biotechnology

Streptococcus thermophilus Cell Wall-Anchored Proteinase: Release, Purification, and Biochemical and Genetic Characterization

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Fernandez-Espla, María Dolores, Garault, Peggy, Monnet, Véronique, Rul, Françoise·2000·Applied and Environmental Microbiology

Abstract

Streptococcus thermophilus CNRZ 385 expresses a cell envelope proteinase (PrtS), which is characterized in the present work, both at the biochemical and genetic levels. Since PrtS is resistant to most classical methods of extraction from the cell envelopes, we developed a three-step process based on loosening of the cell wall by cultivation of the cells in the presence of glycine (20 mM), mechanical disruption (with alumina powder), and enzymatic treatment (lysozyme). The pure enzyme is a serine proteinase highly activated by Ca(2+) ions. Its activity was optimal at 37 degrees C and pH 7.5 with acetyl-Ala-Ala-Pro-Phe-paranitroanilide as substrate. The study of the hydrolysis of the chromogenic and casein substrates indicated that PrtS presented an intermediate specificity between the most divergent types of cell envelope proteinases from lactococci, known as the PI and PIII types. This result was confirmed by the sequence determination of the regions involved in substrate specificity, which were a mix between those of PI and PIII types, and also had unique residues. Sequence analysis of the PrtS encoding gene revealed that PrtS is a member of the subtilase family. It is a multidomain protein which is maturated and tightly anchored to the cell wall via a mechanism involving an LPXTG motif. PrtS bears similarities to cell envelope proteinases from pyogenic streptococci (C5a peptidase and cell surface proteinase) and lactic acid bacteria (PrtP, PrtH, and PrtB). The highest homologies were found with streptococcal proteinases which lack, as PrtS, one domain (the B domain) present in cell envelope proteinases from all other lactic acid bacteria.

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Crossref · 10.1128/aem.66.11.4772-4778.2000

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  1. [29]29. Gibson, T. J. 1984. Studies on the Epstein Barr virus genome. Ph.D. thesis. University of Cambridge, Cambridge, England.
  2. [58]58. Shankar, P. A., and F. L. Davies. 1978. Proteinase and peptidase activities of yogurt starter bacteria, p. 473. In Proceedings of the XX International Dairy Congress, Paris.

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Authors
Fernandez-Espla, M. D., Garault, P., Monnet, V., & Rul, F.
Affiliations
  • <!--label omitted: 1-->Unité de Recherche de Biochimie et Structure des Protéines, Institut National de la Recherche Agronomique, 78352 Jouy-en-Josas Cedex, France
  • Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
Venue
Applied and Environmental Microbiology
Published
2000-11
Volume
66
Issue
11
Pages
4772-4778
ISSN
  • 0099-2240 (ISSN-L)
  • 1098-5336
OpenAlex
W2104046960
Cited by
143
References
68
Citations by year
2026: 3 · 2025: 1 · 2024: 2 · 2023: 5 · 2022: 2 · 2021: 11 · 2020: 10 · 2019: 2 · 2018: 4 · 2017: 4 · 2016: 8 · 2015: 7 · 2014: 9 · 2013: 7 · 2012: 9
FWCI
4.00
Type
journal article
Language
en
Open access
Locations
  • Applied and Environmental Microbiology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
European Commission
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
Streptococcus thermophilus, cell envelope proteinase, PRT, serine protease, LPXTG motif, protease purification, substrate specificity, calcium activation, enzyme maturation, lactic acid bacteria, pyogenic streptococci
MeSH terms
Amino Acid Sequence, Bacterial Proteins, Calcium Chloride, Cell Wall, Enzyme Activation, Genes, Bacterial, Molecular Sequence Data, Serine Endopeptidases, Streptococcus, Substrate Specificity, Sequence Alignment, Sequence Homology, Amino Acid, Sequence Analysis, DNA, Protein Structure, Tertiary

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