pMAD2 derivative designed for chromosomal gene ectopic complementation in Staphylococcus aureu.pECTO a Gram negative/Gram positive shuttle vector derived from pMAD2 designed to integrate DNA sequences between SAOUHSC_00278 and SAOUHSC_00279 (NCTC8325 nomenclature HG003). It carries about 1kb of both sequences. A terminator introduced between the SAOUHSC_00278 and SAOUHSC_00279 sequences prevents polar effects associated with the expression of inserted genes.This a Gram negative/Gram positive shuttle vector with two specialized replicons and antibiotic markers. pBR322 replicon and ampicillin resistance for E. coli. pE194(ts) replicon and erythromycin resistance for S. aureus. In S. aureus, the plasmid propagates at T<30°C, it becomes a suicide vector at T>37°C.