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High concentrations of clavulanic acid but not of its degradation products decrease glycerol consumption and oxygen uptake rates in cultures of Streptomyces clavuligerus.

Abstract：

:Product inhibition of biological production systems is a widely observed phenomenon with prominent implications for the design and ultimately the success of biotechnological processes. In order to investigate whether such effects could limit the maximal concentrations in the production of the beta-lactamase inhibitor clavulanic acid (CA) in Streptomyces clavuligerus cultivations under process-related conditions, we first validated the equivalence of a laboratory scale aerated stirred tank reactor and a medium scale (50 mL) cultivation device, which required optimization of gas transfer in the latter and finally allowed to conduct the required experiments in smaller volumes with correspondingly reduced consumption of compounds. With this, we investigated the effect of CA additions on two global performance parameters: consumption of the carbon source glycerol and oxygen consumption (measured as the oxygen uptake rate, OUR). Increased levels of CA severely interfered with the physiology of the producing strain at least at and above 1.6 g L(-1) CA, as indicated by a dose-dependent decrease in maximal OURs and glycerol consumption rates. As CA is rapidly degraded during cultivation, it was unclear whether CA itself or its decomposition products, a complex mixture containing amongst others several pyrazine derivatives, were responsible for the observed effects. We supplemented S. clavuligerus cultures with mixtures of the decomposition products and found altered OUR and glycerol consumption, but CA production was not influenced. Compared to the drastic effect of CA itself, it is clear that the products of CA degradation exert a much less severe effect on growing S. clavuligerus cultures.

journal_name

Biotechnol Bioeng

journal_title

Biotechnology and bioengineering

authors

Brethauer S,Held M,Panke S

doi

10.1002/bit.21783

subject

Has Abstract

pub_date

2008-06-15 00:00:00

pages

439-47

issue

eissn

0006-3592

issn

1097-0290

journal_volume

100

pub_type

杂志文章

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High concentrations of clavulanic acid but not of its degradation products decrease glycerol consumption and oxygen uptake rates in cultures of Streptomyces clavuligerus.