[Factors causing lysis of an Actinomyces rimosus culture, the producer of the antibiotic, oxytetracycline]

Area of Science:

Context:

Actinomyces rimosus is a key microorganism in the industrial production of oxytetracycline.
Massive growth of microbial cultures can be susceptible to lysis, impacting yield.
Understanding lysis mechanisms is crucial for optimizing fermentation processes.

Purpose:

To identify and characterize the factors responsible for the lysis of Actinomyces rimosus during oxytetracycline production.
To investigate the nature and properties of these lytic agents.

Summary:

Lysis of Actinomyces rimosus during oxytetracycline fermentation is attributed to two distinct factors isolated via differential centrifugation.
The first factor comprises temperate phage particles, which, though incapable of growth, can induce lysis. Their lytic activity is lost upon treatment with low pH and 70°C.
The second factor is a lytic enzyme system, produced under the control of the induced temperate phage, appearing to consist of at least one lytic and one proteolytic enzyme.

Impact:

This research elucidates the dual mechanisms causing microbial lysis in antibiotic production.
Findings contribute to strategies for preventing lysis and enhancing oxytetracycline yields.
Identifies phage particles and enzyme systems as targets for microbial process control.