The present invention and relates to recombination engineering and protein expression in biology field.More specifically, the present invention relates to be used for the nucleic acid of recombinant expression of proteins, it comprises the sequence that derives from galactococcus and be used as promotor.The invention still further relates to the carrier that comprises described nucleic acid and use its transformed host cells.The present invention comprises that also the host cell that comprises described nucleic acid or carrier is used for the purposes of expressing heterologous or homologous protein And be used for described protein to the sending of experimenter, the therapeutic purposes of sending especially.