pSTOP1622质粒是一个枯草杆菌载体，Bacillus megaterium is a rod-shaped, non-pathogenic Gram-positive bacterium, which is able to grow on a wide variety of carbon sources. Like other soil bacteria, it is able to secrete high amount of protein into the culture medium (up to 0.5 g/L of recombinant protein). This property, together with its ability to grow in many ecological niches such as waste from meat industry, melasse or petrochemical effluents makes it an interesting organism for industrial-scale production of recombinant proteins. In addition to B. subtilis, it has been used as Gram-positive model organism for studying several research topics such as biochemistry, sporulation, and bacteriophages.