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One-step Extraction and Zymographic Analysis of Bacterial Gelatinases
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AN INACTIVE PRECURSOR OF STREPTOCOCCAL PROTEINASE.

S D Elliott1, V P Dole

  • 1Hospital of The Rockefeller Institute for Medical Research.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Streptococcal proteinase is produced from an inactive precursor via an autocatalytic process. This conversion is influenced by environmental factors like temperature and oxygen levels, impacting enzyme activity.

Keywords:
ENZYMES/proteolyticPROTEINASESTREPTOCOCCI

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Area of Science:

  • Microbiology
  • Enzymology

Background:

  • Streptococcal proteinase is an extracellular enzyme produced by certain streptococci.
  • The enzyme exists as an inactive precursor in culture filtrates.

Purpose of the Study:

  • To investigate the mechanism of streptococcal proteinase activation.
  • To identify factors influencing the conversion of the precursor to the active enzyme.

Main Methods:

  • Culturing proteinase-producing streptococci in suitable media.
  • Assessing the effect of trypsin and chymotrypsin on precursor activation.
  • Investigating autocatalytic conversion under varying conditions (temperature, aeration, presence of casein).

Main Results:

  • The inactive precursor is converted to active streptococcal proteinase.
  • Trypsin, but not chymotrypsin, can activate the precursor.
  • Autocatalytic activation occurs under reducing conditions, initiated by active proteinase.
  • Activation is inhibited by low temperatures (22°C vs. 37°C), aerobic conditions, and casein.

Conclusions:

  • Streptococcal proteinase activation is an autocatalytic process.
  • Environmental factors significantly modulate the rate of proteinase activation.