Screening of Medium Constituents for Clavulanic Acid Production by Streptomyces Clavuligerus

Overview

Journal Braz J Microbiol

Specialty Microbiology

Date 2018 Mar 29

PMID 29588197

Citations 3

Authors

Kaio Cesar da Silva Rodrigues

Arianne Tairyne de Souza

Alberto Colli Badino

Danielle Biscaro Pedrolli

Marcel Otavio Cerri

Affiliations

Soon will be listed here.

Abstract

Clavulanic acid is a β-lactam compound with potent inhibitory activity against β-lactamases. Studies have shown that certain amino acids play essential roles in CA biosynthesis. However, quantitative evaluations of the effects of these amino acids are still needed in order to improve CA production. Here, we report a study of the nutritional requirements of Streptomyces clavuligerus for CA production. Firstly, the influence of the primary nitrogen source and the salts composition was investigated. Subsequently, soybean protein isolate was supplemented with arginine (0.0-3.20gL), threonine (0.0-1.44gL), ornithine (0.0-4.08gL), and glutamate (0.0-8.16gL), according to a two-level central composite rotatable design. A medium containing ferrous sulfate yielded CA production of 437mgL, while a formulation without this salt produced only 41mgL of CA. This substantial difference suggested that Fe is important for CA biosynthesis. The experimental design showed that glutamate and ornithine negatively influenced CA production while arginine and threonine had no influence. The soybean protein isolate provided sufficient C5 precursor for CA biosynthesis, so that supplementation was unnecessary. Screening of medium components, together with experimental design tools, could be a valuable way of enhancing CA titers and reducing the process costs.

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