Molecular Cloning and Characterization of a New cDNA Sequence Encoding a Venom Peptide from the Centipede Scolopendra subspinipes Mutilans

摘要

Many studies have been performed on venomous peptides derived from animals. However, little of this research has focused on peptides from centipede venoms. Here, a venom gland cDNA library was successfully constructed for the centipede Scolopendra subspinipes mutilans. A new cDNA encoding the precursor of a venom peptide, named SsmTx, was cloned from the venomous gland cDNA library of the centipede S. subspinipes mutilans. The full-length SsmTx cDNA sequence is 465 nt, including a 249 nt ORF, a 45 nt 5' UTR and a 171 nt 3' UTR. There is a signal tail AATAAA 31 nt upstream of the poly (A) tail. The precursor nucleotide sequence of SsmTx encodes a signal peptide of 25 residues and a mature peptide of 57 residues, which is bridged by two pairs of disulfide bonds. SsmTx displays a unique cysteine motif that is completely different from that of other venomous animal toxins: This is the first reported cDNA sequence encoding a venom peptide from the centipede S. subspinipes mutilans.