Arabinose-inducible genetic elements from the Salmonella typhimurium a
rabinose operon were inserted into pACYC184. The resultant plasmid, pA
R3, is compatible with ColE1-derived plasmids and allows efficient exp
ression of recombinant (re) genes upon induction with arabinose. These
features make it convenient for use in combination with standard gene
expression vectors for the independently controlled production of two
or more re-polypeptides in Escherichia coli.