AcrAP1 (AP1-Z1) is an antimicrobial peptide found in the venom of the Arabian scorpion (Androctonus crassicauda). AcrAP1 has antimicrobial activity and can inhibit the growth of Gram-positive and Gram-negative bacteria as well as yeast. AcrAP1 exerts antitumor activity by promoting apoptosis of cancer cells and inhibiting angiogenesis. AcrAP1 can be used in cancer therapy research.