Visualization of protoplast fusion and quantitation of recombination in fused protoplasts of auxotrophic strains of Escherichia coli.
Protoplast fusion has been used to combine genes from different organisms to create strains with desired properties. A recently developed variant on this approach, genome shuffling, involves generation of a genetically heterogeneous population of a single organism, followed by recursive protoplast fusion to allow recombination of mutations within the fused protoplasts. These are powerful techniques for engineering of microbial strains for desirable industrial properties. However, there is a prevailing opinion that it will be difficult to use these methods for engineering of Gram-negative bacteria because the outer membrane makes protoplast fusion more difficult. Here we describe the successful use of protoplast fusion in Escherichia coli. Using two auxotrophic strains of E. coli, we obtained prototrophic strains by recombination in fused protoplasts at frequencies of 0.05-0.7% based on the number of protoplasts subjected to fusion. This frequency is three-four orders of magnitude better than those previously reported for recombination in fused protoplasts of Gram-negative bacteria such as E. coli and Providencia alcalifaciens.
Dai
MingHua
M
Department of Molecular, Cellular, and Developmental Biology and Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, CO 80309, USA.
Ziesman
Sara
S
Ratcliffe
Thomas
T
Gill
Ryan T
RT
Copley
Shelley D
SD
D019677:Artificial Gene Fusion / Q000379:methods; D003001:Cloning, Molecular / Q000379:methods*; D032621:DNA Shuffling / Q000379:methods; D004926:Escherichia coli / Q000145:classification* / Q000235:genetics* / Q000648:ultrastructure; D011523:Protoplasts / Q000648:ultrastructure*; D011995:Recombination, Genetic; D013045:Species Specificity