✍ Scribed by Bruno Diez; Encarnación Mellado; Marta Rodriguez; Roberto Fouces; José-Luis Barredo
No coin nor oath required. For personal study only.
The enhancement of industrial antibiotic yield enzymes for each antibiotic (Martı ´n and Gutie ´rrez, has been achieved through technological innovations and 1995; Martı ´n and Liras, 1989). traditional strain improvement programs based on ran-For many years genetic manipulation of microorgandom mutation and screening. The development of recomisms was limited to improvement programs based in binant DNA techniques and their application to antibiotic random mutation and selection, and even today these producing microorganisms has allowed yield increments techniques are indispensable tools for the development and the design of biosynthetic pathways giving rise to new antibiotics. Genetic manipulations of the cephaloof complex processes with a scarce background of mosporin producing fungus Cephalosporium acremonium lecular knowledge. Strain improvement by random muhave included yield improvements, accomplished intation and screening is an essential part of the convencreasing biosynthetic gene dosage or enhancing oxygen tional antibiotic production improvement programs, uptake, and new biosynthetic capacities as 7-aminocephallowing the blocking of undesired enzymatic activities, alosporanic acid (7-ACA) or penicillin G production. Similarly, in Penicillium chrysogenum, the industrial penicillin removing negative regulations, increasing gene dosage, producing fungus, heterologous expression of cephaloetc. New strains can be selected to cover specific pursporin biosynthetic genes has led to the biosynthesis of poses such as the increase of antibiotic production, use adipyl-7-aminodeacetoxycephalosporanic acid (adipyl-7of cheaper raw materials, fermentation at different tem-ADCA) and adipyl-7-ACA, compounds that can be transperatures or with reduced oxygen needs, shorter ferformed into the economically relevant 7-ADCA and 7-ACA intermediates. Escherichia coli expression of the genes mentation batches, special cell morphology, etc. Penicilencoding D-amino acid oxidase and cephalosporin acylium chrysogenum, the industrial penicillin producing lase activities has simplified the bioconversion of cephafungus, is a classical example of this strategy. Penicillin losporin C into 7-ACA, eliminating the use of organic solyield has been increased more than 2 orders of magnivents. The genetic manipulation of antibiotic producing tude from the 1950s to the present time and theoretical actinomycetes has allowed productivity increments and the development of new hybrid antibiotics. A legal framestudies have established that the maximum potential of work has been developed for the confined manipulation this species has not yet been reached. Procedures of of genetically modified organisms.
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## Abstract Yeast extract (YE) is commonly used as a key component in the complex media for industrial fermentations. However, the lot‐to‐lot variation of this raw material frequently requires extensive “use testing” of many lots to identify only the few that support desired fermentation performanc