2c05

CRYSTAL STRUCTURES OF EOSINOPHIL-DERIVED NEUROTOXIN IN COMPLEX WITH THE INHIBITORS 5'-ATP, AP3A, AP4A AND AP5A

spinqualitylabelsall models 2c05, resolution 1.86Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2c05 is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACY, B4P Related: 1gqv, 1hi2, 1hi3, 1hi4, 1hi5, 1k2a, 2bex, 2bzz, 2c01, 2c02 Activity: Pancreatic ribonuclease, with EC number 3.1.27.5 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum 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 Eosinophil-derived neurotoxin (EDN) is a catalytically proficient member of the pancreatic ribonuclease superfamily secreted along with other eosinophil granule proteins during innate host defense responses and various eosinophil-related inflammatory and allergic diseases. The ribonucleolytic activity of EDN is central to its antiviral and neurotoxic activities and possibly to other facets of its biological activity. To probe the importance of this enzymatic activity further, specific inhibitors will be of great aid. Derivatives of 5'-ADP are among the most potent inhibitors currently known. Here, we use X-ray crystallography to investigate the binding of four natural nucleotides containing this moiety. 5'-ATP binds in two alternative orientations, one occupying the B2 subsite in a conventional manner and one being a retro orientation with no ordered adenosine moiety. Diadenosine triphosphate (Ap3A) and diadenosine tetraphosphate (Ap4A) bind with one adenine positioned at the B2 subsite, the polyphosphate chain extending across the P1 subsite in an ill-defined conformation, and a disordered second adenosine moiety. Diadenosine pentaphosphate (Ap5A), the most avid inhibitor of this series, binds in a completely ordered fashion with one adenine positioned conventionally at the B2 subsite, the polyphosphate chain occupying the P1 and putative P(-1) subsites, and the other adenine bound in a retro-like manner at the edge of the B1 subsite. The binding mode of each of these inhibitors has features seen in previously determined structures of adenosine diphosphates. We examine the structure-affinity relationships of these inhibitors and discuss the implications for the design of improved inhibitors. Crystal structures of eosinophil-derived neurotoxin (EDN) in complex with the inhibitors 5'-ATP, Ap3A, Ap4A, and Ap5A.,Baker MD, Holloway DE, Swaminathan GJ, Acharya KR Biochemistry. 2006 Jan 17;45(2):416-26. PMID:16401072 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease Temp

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