The in vivo cloning system based on mini-Mu derivatives was used for c
loning the sucrase operon. We constructed several recombinant plasmids
pJT21, pMM2324, pMM2325 with a complete sucrase operon. Two strains o
f Escherichia coli containing this plasmid replicon were able to grow
on different concentrations of sucrose. The stability of recombinant p
lasmids was determined after cultivation under nonselective conditions
. The stability after 5-d cultivation was higher than 75%.