1fq3
From Proteopedia
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CRYSTAL STRUCTURE OF HUMAN GRANZYME B
Overview
Granzyme B is the prototypic member of the granzymes, a family of, trypsin-like serine proteinases localized in the dense cytoplasmic, granules of activated natural killer cells and cytotoxic T lymphocytes., Granzyme B directly triggers apoptosis in target cells by activating the, caspase pathway, and has been implicated in the etiology of rheumatoid, arthritis. Human granzyme B expressed in a baculovirus system has been, crystallized without inhibitor and its structure has been determined to, 3.1 A resolution, after considerably improving the diffraction power of, the crystals by controlled humidity changes. The granzyme B structure, reveals an overall fold similar to that found in cathepsin G and human, chymase. The guanidinium group of Arg226, anchored at the back of the, S1-specificity pocket, can form a salt bridge with the P1-Asp side chain, of a bound peptide substrate. The architecture of the substrate binding, site of granzyme B appears to be designed to accommodate and cleave, hexapeptides such as the sequence Ile-Glu-Thr-Asp-/Ser-Gly present in the, activation site of pro-caspase-3, a proven physiological substrate of, granzyme B. These granzyme B crystals, with fully accessible active sites, are well suited for soaking with small synthetic inhibitors that might be, used for a treatment of chronic inflammatory disorders.
About this Structure
1FQ3 is a Single protein structure of sequence from Homo sapiens with SO4 as ligand. Active as Granzyme B, with EC number 3.4.21.79 Full crystallographic information is available from OCA.
Reference
Crystal structure of the caspase activator human granzyme B, a proteinase highly specific for an Asp-P1 residue., Estebanez-Perpina E, Fuentes-Prior P, Belorgey D, Braun M, Kiefersauer R, Maskos K, Huber R, Rubin H, Bode W, Biol Chem. 2000 Dec;381(12):1203-14. PMID:11209755
Page seeded by OCA on Mon Nov 12 16:56:08 2007
