Reduced Genome Bacteria With Improved Genetic Stability

Abstract

Reduced genome bacteria with improved genetic stability are provided. Also provided are methods of producing polypeptides using the reduced genome bacteria with improved genetic stability.

What is claimed is: 
     
         1 . A reduced genome  Escherichia coli  bacterium, having a genome that is genetically engineered to be from about 5% to about 22% smaller than the genome of its native parent strain, wherein said bacterium lacks all IS1, IS2, IS3, IS4, IS5, IS30, IS150, IS186, IS600, IS911 and IS10 insertion sequences and lacks a functional polB gene and lacks a functional dinB gene and optionally lacks a functional umuDC gene. 
     
     
         2 . The bacterium of  claim 1 , lacking a functional umuDC gene. 
     
     
         3 . The bacterium of  claim 1  comprising a heterologous nucleic acid. 
     
     
         4 . The bacterium of  claim 3  wherein said heterologous nucleic acid comprises a nucleic acid encoding a polypeptide operatively linked to an expression control sequence. 
     
     
         5 . A method for producing a polypeptide comprising incubating the bacterium of  claim 4  under conditions suitable for expressing the polypeptide and collecting the polypeptide.