Construction of a Xylanase-Producing Strain of Brevibacterium lactofermentum by Stable Integration of an Engineered xysA Gene from Streptomyces halstedii JM8

Author:

Adham Sirin A. I.1,Campelo Ana B.1,Ramos Angelina1,Gil José A.1

Affiliation:

1. Departamento de Ecologı́a, Genética y Microbiologı́a, Área de Microbiologı́a, Facultad de Biologı́a, Universidad de León, León, Spain

Abstract

ABSTRACT A xylanolytic strain of Brevibacterium lactofermentum containing the Streptomyces halstedii His-tagged xysA gene was generated. The new strain contains DNA derived from S . halstedii , expresses xylanolytic activity, and was obtained by an integrative process mediated by a conjugative plasmid targeted to a dispensable chromosomal region located downstream from the essential cell division gene ftsZ . The His-tagged Xys1 enzyme was constitutively expressed under the control of the kan promoter from Tn 5 and was easily purified by use of Ni-nitrilotriacetic acid-agarose. The new strain is stable for more than 200 generations, lacks any known antibiotic resistance gene, and does not need any selective pressure to maintain the integrated gene. This strategy can be used to integrate any gene into the B . lactofermentum chromosome and to maintain it stably without the use of antibiotics for selection.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference24 articles.

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