title: High-level overproduction of Thermus enzymes in Streptomyces lividans.
abstract: Biotechnology needs to explore the capacity of different organisms to overproduce proteins of interest at low cost. In this paper, we show that Streptomyces lividans is a suitable host for the expression of Thermus thermophilus genes and report the overproduction of the corresponding proteins. This capacity was corroborated after cloning the genes corresponding to an alkaline phosphatase (a periplasmic enzyme in T. thermophilus) and that corresponding to a beta-glycosidase (an intracellular enzyme) in Escherichia coli and in S. lividans. Comparison of the production in both hosts revealed that the expression of active protein achieved in S. lividans was much higher than in E. coli, especially in the case of the periplasmic enzyme. In fact, the native signal peptide of the T. thermophilus phosphatase was functional in S. lividans, being processed at the same peptide bond in both organisms, allowing the overproduction and secretion of this protein to the S. lividans culture supernatant. As in E. coli, the thermostability of the expressed proteins allowed a huge purification factor upon thermal denaturation and precipitation of the host proteins. We conclude that S. lividans is a very efficient and industry-friendly host for the expression of thermophilic proteins from Thermus spp.
authors.affiliation: Instituto de Microbiología Bioquímica, Departamento de Microbiología y Genética, Consejo Superior de Investigaciones Científicas, Universidad de Salamanca, Edificio Departamental, Campus Miguel de Unamuno, 37007 Salamanca, Spain. mardi@usal.es
authors.forename: Margarita
authors.initials: M
authors.lastname: Díaz
authors.forename: Eloy
authors.initials: E
authors.lastname: Ferreras
authors.forename: Renata
authors.initials: R
authors.lastname: Moreno
authors.forename: Ana
authors.initials: A
authors.lastname: Yepes
authors.forename: José
authors.initials: J
authors.lastname: Berenguer
authors.forename: Ramón
authors.initials: R
authors.lastname: Santamaría
mesh_terms: D000469:Alkaline Phosphatase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D003001:Cloning, Molecular; D004795:Enzyme Stability; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D015870:Gene Expression; D005818:Genetic Engineering; D006026:Glycoside Hydrolases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D048170:Streptomyces lividans / Q000235:genetics / Q000378:metabolism*; D013696:Temperature; D016963:Thermus thermophilus / Q000201:enzymology*
chemical_list: D001426:Bacterial Proteins; D000469:Alkaline Phosphatase; D006026:Glycoside Hydrolases