The invention relates to a novel peptide conjugate useful for stabilizing the actin cytoskeleton of mammalian cells. More particularly, the invention relates to a conjugate of a peptide found within the sequence of a bacterium's major outer sheath protein and bovine serum albumin (BSA), and the use of this conjugate for stabilizing the actin cytoskeleton of mammalian cells, and for preventing or controlling the migration of mammalian cells.