title: A Novel Factor Xa-Inhibiting Peptide from Centipedes Venom.
abstract: Centipedes have been used as traditional medicine for thousands of years in China. Centipede venoms consist of many biochemical peptides and proteins. Factor Xa (FXa) is a serine endopeptidase that plays the key role in blood coagulation, and has been used as a new target for anti-thrombotic drug development. A novel FXa inhibitor, a natural peptide with the sequence of Thr-Asn-Gly-Tyr-Thr (TNGYT), was isolated from the venom ofScolopendra subspinipesmutilansusing a combination of size-exclusion and reverse-phase chromatography. The molecular weight of the TNGYT peptide was 554.3 Da measured by electrospray ionization mass spectrometry. The amino acid sequence of TNGYT was determined by Edman degradation. TNGYT inhibited the activity of FXa in a dose-dependent manner with an IC50value of 41.14 mg/ml. It prolonged the partial thromboplastin time and prothrombin time in both in vitro and ex vivo assays. It also significantly prolonged whole blood clotting time and bleeding time in mice. This is the first report that an FXa inhibiting peptide was isolated from centipedes venom.
authors.affiliation: School of Life Science & Technology, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, 210009 People's Republic of China ; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009 People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Kong
authors.forename: Yu
authors.initials: Y
authors.lastname: Shao
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Xin
authors.initials: X
authors.lastname: Ming
authors.forename: Jin-Bin
authors.initials: JB
authors.lastname: Wang
authors.forename: Zhi-Yu
authors.initials: ZY
authors.lastname: Li
authors.forename: Ji-Fu
authors.initials: JF
authors.lastname: Wei
keywords: Anticoagulation; FXa inhibitor; Peptide; Scolopendra subspinipes mutilans venom