Controllable expression system, regulatory protein, gene encoding the same, expression cassette, microorganism containing the same, method for producing protein, method for producing microorganism, and host strain

摘要

Expression system (A) regulatable by acetate, pH and O2 comprises: (1) regulatory protein (I), acting in trans, that is at least 75% homologous to the 290 residue amino acid sequence given in the specification; and (2) promoter (II), acted on by (I), that is at least 95% homologous to the bases 315-397 of the 1453 bp nucleic acid sequence given in the specification. Also new are: (1) regulatory protein (Ia), that under conditions of O2 limitation, in the presence of acetate and at growth medium pH 6-6.5 causes optimum activation of the bud promoter of Klebsiella terrigena DSM 2687; (2) gene encoding (Ia); (3) expression cassette contg. (II), functionally linked to a structural gene encoding a heterologous protein; and (4) microorganism contg. the cassette of (3), or (A).