2uux | pdb_00002uux

Structure of the tryptase inhibitor TdPI from a tick

spinqualitylabelsall models 2uux, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2uux is a 1 chain structure with sequence from Rhipicephalus appendiculatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 2uuv Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed TdPI, a tick salivary gland product related to Kunitz/BPTI proteins is a potent inhibitor of human beta-tryptase. Kinetic assays suggest that three of the four catalytic sites of tryptase are blocked by TdPI, and that the inhibition of one of these involves a peptide flanking the Kunitz head. In the course of the inhibition, tryptase cleaves TdPI at several positions. Crystal structures of the TdPI head, on its own and in complex with trypsin, reveal features that are not found in classical Kunitz/BPTI proteins and suggest the mode of interaction with tryptase. The loop of TdPI connecting the beta-sheet with the C-terminal alpha-helix is shortened, the disulphide-bridge pattern altered and N and C termini separated to produce a highly pointed molecule capable of penetrating the cramped active sites of tryptase. TdPI accumulates in the cytosolic granules of mast cells, presumably suppressing inflammation in the host animal's skin by tryptase inhibition. A tick protein with a modified Kunitz fold inhibits human tryptase.,Paesen GC, Siebold C, Harlos K, Peacey MF, Nuttall PA, Stuart DI J Mol Biol. 2007 May 11;368(4):1172-86. Epub 2007 Mar 14. PMID:17391695 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Tryptase inhibitor

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