title: Crystal structure of a non-hemorrhagic fibrin(ogen)olytic metalloproteinase complexed with a novel natural tri-peptide inhibitor from venom of Agkistrodon acutus.
abstract: Thrombotic occlusive diseases pose a great threat to human health. Thrombolytic agents are in widespread use for the dissolution of arterial and venous pathologic thrombi in these kinds of diseases. Snake venom metalloproteinases (SVMPs) can act directly on fibrin/fibrinogen and are therefore potential candidates for therapeutic use against thrombotic occlusive diseases. In this study, we have determined the crystal structure of FII, a novel non-hemorrhagic SVMP isolated from Anhui Agkistrodon acutus snake venom by molecular replacement. The structure reveals that FII is a member of the P-I class SVMPs. The Zn2+ ion essential for hydrolytic activity is found in the active site and is tetrahedrally co-ordinated by three histidine residues and water molecule. Unambiguous electron density for a tri-peptide with sequence KNL is also found located near the active site. Biochemical evidences show that the tri-peptide KNL can inhibit the enzymatic activity of FII.
authors.affiliation: Laboratory of Structural Biology, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Lou
authors.forename: Jing
authors.initials: J
authors.lastname: Hou
authors.forename: Xiuxia
authors.initials: X
authors.lastname: Liang
authors.forename: Jiashu
authors.initials: J
authors.lastname: Chen
authors.forename: Pengxin
authors.initials: P
authors.lastname: Qiu
authors.forename: Yiwei
authors.initials: Y
authors.lastname: Liu
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Zihe
authors.initials: Z
authors.lastname: Rao
authors.forename: Guangmei
authors.initials: G
authors.lastname: Yan
mesh_terms: D000595:Amino Acid Sequence / Q000235:genetics; D000818:Animals; D001665:Binding Sites / Q000235:genetics; D002364:Caseins / Q000378:metabolism; D003435:Crotalid Venoms / Q000737:chemistry / Q000201:enzymology* / Q000633:toxicity; D018360:Crystallography, X-Ray; D003553:Cystine / Q000737:chemistry; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000378:metabolism*; D005343:Fibrinolytic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D006470:Hemorrhage / Q000139:chemically induced; D045726:Metalloproteases / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009842:Oligopeptides / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D017386:Sequence Homology, Amino Acid; D015032:Zinc / Q000737:chemistry
chemical_list: C031442:Agkistrodon venoms; D002364:Caseins; D003435:Crotalid Venoms; D004791:Enzyme Inhibitors; D005343:Fibrinolytic Agents; D009842:Oligopeptides; C026018:azocasein; D003553:Cystine; D045726:Metalloproteases; D015032:Zinc