1c3a | pdb_00001c3a

CRYSTAL STRUCTURE OF FLAVOCETIN-A FROM THE HABU SNAKE VENOM, A NOVEL CYCLIC TETRAMER OF C-TYPE LECTIN-LIKE HETERODIMERS

spinqualitylabelsall models 1c3a, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1c3a is a 2 chain structure with sequence from Protobothrops flavoviridis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SLAA_PROFL Strong platelet aggregation inhibitor. Binds specifically to platelet glycoprotein Ibalpha (GP1BA) with high affinity and inhibits vWF-dependent platelet aggregation (PubMed:7599152). Has also been observed to induce small agglutinates in washed platelets by binding to GPIb (PubMed:10688335). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Snake venom contains a number of the hemostatically active C-type lectin-like proteins, which affect the interaction between von Willebrand factor (vWF) and the platelet glycoprotein (GP) Ib or platelet receptor to inhibit/induce platelet activation. Flavocetin-A (FL-A) is a high-molecular mass C-type lectin-like protein (149 kDa) isolated from the habu snake venom. FL-A binds with high affinity to the platelet GP Ibalpha-subunit and functions as a strong inhibitor of vWF-dependent platelet aggregation. We have determined the X-ray crystal structure of FL-A and refined to 2.5 A resolution. This is a first elucidation of a three-dimensional structure of the platelet GP Ib-binding protein. The overall structure reveals that the molecule is a novel cyclic tetramer (alphabeta)(4) made up of four alphabeta-heterodimers related by a crystallographic 4-fold symmetry. The tetramerization is mediated by an interchain disulfide bridge between cysteine residues at the C-terminus of the alpha-subunit and at the N-terminus of the beta-subunit in the neighboring alphabeta-heterodimer. The high affinity of FL-A for the platelet GP Ib alpha-subunit could be explained by a cooperative-binding action through the multiple binding sites of the tetramer. Crystal structure of flavocetin-A, a platelet glycoprotein Ib-binding protein, reveals a novel cyclic tetramer of C-type lectin-like heterodimers.,Fukuda K, Mizuno H, Atoda H, Morita T Biochemistry. 2000 Feb 29;39(8):1915-23. PMID:10684640 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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