Date of Award


Degree Type


Degree Name

Doctor of Philosophy


Bacteriophage Mu integrates and replicates its genome via DNA transposition. Mu transposition during integration is non-replicative (conservative) and generates simple insertions. Transposition during the lytic cycle is replicative and amplifies the Mu genome by cointegrate production. Mu therefore, must choose between these two pathways. Infecting Mu-DNA is found associated with a coinjected, 64-kDa virion protein bound noncovalently to its ends. Characterization of the protein-DNA complex is reported here.;Antiserum was prepared against the virion 64-kDa protein and used to probe an expression library of cloned Mu DNA sequences. The Mu {dollar}N{dollar} gene was mapped to the overproducing clones by physical and genetic techniques. Partial proteolysis of the N protein produced in vitro and the 64-kDa protein isolated from the protein-DNA complex showed them to be identical. The Mu {dollar}N{dollar} gene was sequenced and a region of homology to many site specific DNA binding proteins was observed.;The transposition end product produced in vitro by the N protein-Mu DNA complex isolated from Mu infected cells was examined by neutral and alkaline agarose gel electrophoresis. The protein-DNA complex was found to form an identical strand transferred end product as the mini-Mu control plasmid. The implication of these findings for Mu integration is that in vivo, the strand transferred product is probably processed by a second nick following the initial strand transfer reaction of transposition.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.