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PubMed · 34302

[Autolysis of hemolytic streptococcus group A].

N F Dmitrieva·E P Savel'ev·N A Chistenkov·G I Petrov
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Abstract

As revealed, autolytic enzymatic system of hemolytic streptococcus, group A, expressed the maximal activity at the end of the exponential growth phase. Autolysis was accompanied by the release of N-acetylaminosugars and of free amino group. Optimal conditions for the lytic system function were chosen (composition, ionic strength, and buffer pH). The activating action of trypsin and chemotrypsin was demonstrated.

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BacteriolysisCell WallCulture MediaEnzyme ActivationHydrogen-Ion ConcentrationPeptide HydrolasesStreptococcus pyogenesTime FactorsEnglish AbstractJournal Article

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N F Dmitrieva, E P Savel'ev, N A Chistenkov, G I Petrov. 1978. [Autolysis of hemolytic streptococcus group A].. https://pubmed.ncbi.nlm.nih.gov/34302/

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An ultraviolet light induced prophage has been discovered in the red pigmented marine vibrio Beneckea gazogenes. Two spontaneously derived pigment mutants, one forming pink colonies and one lacking pigment and forming white colonies, were also irradiated. The presence of pigment was not related to phage induction; uv-induced cell lysis occurred in wildtype and mutant strains at the same dosages. Lysis was not prevented or retarded by exposure after irradiation to visible light indicating the phenomenon was not photoreactivable. Electron micrographs of the 'T-like' B. gazogenes phage are shown. A second beneckea was isolated form the anaerobic zone of cyanobacterial mats growing in the hypersaline environment of Laguna Mormona, Baja California. The Baja beneckea does not harbor a uv inducible prophage and is resistant to the B. gazogenes phage under all conditions tested.

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