An endogenous plasmid of Propionibacterium is described, isolated from Propionibacteria freudenreichii LMG 16545 (deposited as CBS 101022), and its sequence provided. This plasmid can be used to transform Propionibacteria to express homologous or heterologous proteins, in the production of recombinant proteins or products of enzymes, for example vitamin B12.
