Premium
The φX174‐type primosome promotes replisome assembly at the site of recombination in bacteriophage Mu transposition
Author(s) -
Jones Jessica M.,
Nakai Hiroshi
Publication year - 1997
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/16.22.6886
Subject(s) - biology , replisome , recombination , transposition (logic) , bacteriophage , genetics , site specific recombination , bacteriophage mu , type (biology) , dna , dna replication , microbiology and biotechnology , recombinase , gene , linguistics , philosophy , escherichia coli , circular bacterial chromosome , ecology
Initiation of Escherichia coli DNA synthesis primed by homologous recombination is believed to require the φX174‐type primosome, a mobile priming apparatus assembled without the initiator protein DnaA. We show that this primosome plays an essential role in bacteriophage Mu DNA replication by transposition. Upon promoting transfer of Mu ends to target DNA, the Mu transpososome undergoes transition to a pre‐replisome that permits initiation of DNA synthesis only in the presence of primosome assembly proteins PriA, DnaT, DnaB and DnaC. These assembly proteins promote the engagement of primase and DNA polymerase III holoenzyme, initiating semi‐discontinuous replication preferentially at the Mu left end. The results indicate that these proteins play a crucial role in promoting replisome assembly on a recombination intermediate.