Applied Microbiology and Biotechnology, Vol.105, No.12, 5067-5075, 2021
Identification of phage recombinase function unit in genus Corynebacterium
Phage recombinase function unit (PRFU) plays a key role in the life cycle of phage. Repurposing this system such as lambda-Red alpha beta or Rac-RecET for recombineering has gained success in Escherichia coli. Previous studies have showed that most PRFUs only worked well in its native hosts but poorly in the distant species. Thus, identification of new PRFUs in specific species is necessary for the development of its corresponding genetic engineering tools. Here, we present a thorough study of PRFUs in the genomes of genus Corynebacterium. We first used a database to database searching method to facilitate accurate prediction of novel PRFUs in 423 genomes. A total number of 60 sets of unique PRFUs were identified and divided into 8 types based on evolution affinities. Recombineering ability of the 8 representative PRFUs was experimentally verified in the Corynebacterium glutamicum ATCC 13032 strain. In particular, PRFU from C. aurimucosum achieved highest efficiency in both ssDNA and dsDNA mediated recombineering, which is expected to greatly facilitate genome engineering in genus Corynebacterium. These results will provide new insights for the study and application of PRFUs.