2bex

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spinqualitylabelsall models PDB ID 2bex Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
, resolution 1.99Å
Sites:
Ligands:	and
Activity:	Pancreatic ribonuclease, with EC number 3.1.27.5
Coordinates:	save as pdb, mmCIF, xml

CRYSTAL STRUCTURE OF PLACENTAL RIBONUCLEASE INHIBITOR IN COMPLEX WITH HUMAN EOSINOPHIL DERIVED NEUROTOXIN AT 2A RESOLUTION

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

Placental ribonuclease inhibitor (RI) binds diverse mammalian RNases with dissociation constants that are in the femtomolar range. Previous studies on the complexes of RI with RNase A and angiogenin revealed that RI utilises largely distinctive interactions to achieve high affinity for these two ligands. Here we report a 2.0 angstroms resolution crystal structure of RI in complex with a third ligand, eosinophil-derived neurotoxin (EDN), and a mutational analysis based on this structure. The RI-EDN interface is more extensive than those of the other two complexes and contains a considerably larger set of interactions. Few of the contacts present in the RI-angiogenin complex are replicated; the correspondence to the RI-RNase A complex is somewhat greater, but still modest. The energetic contributions of various interface regions differ strikingly from those in the earlier complexes. These findings provide insight into the structural basis for the unusual combination of high avidity and relaxed stringency that RI displays.

Disease

Known diseases associated with this structure: Aicardi-Goutieres syndrome 4 OMIM:[606034], Creutzfeldt-Jakob disease OMIM:[176640], Gerstmann-Straussler disease OMIM:[176640], High density lipoprotein cholesterol level QTL 7 OMIM:[131240], Huntington disease-like 1 OMIM:[176640], Insomnia, fatal familial OMIM:[176640], Prion disease with protracted course OMIM:[176640]

About this Structure

2BEX is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Molecular recognition of human eosinophil-derived neurotoxin (RNase 2) by placental ribonuclease inhibitor., Iyer S, Holloway DE, Kumar K, Shapiro R, Acharya KR, J Mol Biol. 2005 Apr 1;347(3):637-55. PMID:15755456

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