A Novel Expression System forSalmonella typhimuriumAllowing High Production Levels, Product Secretion and Efficient Recovery

Abstract A novel expression system for heterologous production in Salmonella typhimurium, taking advantage of the promoter, signal sequence and two IgG-binding domains (ZZ) from staphylococcal protein A, has been investigated. The production of two different fusions proteins, ZZ-M3 and ZZ-M5, was characterized in terms of production levels, product localization (periplasm or culture medium) and product quality after affinity purification. High expression levels and efficient product secretion were obtained, making the system attractive for vaccine development. The potential use of S. typhimurium as host for heterologous production in biotechnology is discussed.