A recombinant vector enables independent expression of a foreign gene without interfering with a biological circuit of a host cell. A gene encoding a guanylyl cyclase, a gene encoding cGMP receptor protein, and a regulatory nucleotide sequence to which cGMP receptor protein binds, which are derived from a microorganism, are recombined in at least one plasmid. Using the recombinant vector, a foreign gene may be independently expressed without interfering with a biological circuit of a host cell.