1b1u
From Proteopedia
|
CRYSTAL STRUCTURE OF THE BIFUNCTIONAL INHIBITOR RAGI
Overview
The crystal structure of a bifunctional inhibitor of alpha-amylase and trypsin (RATI) from ragi seeds (Indian finger millet, Eleusine coracana Gaertneri) has been determined by X-ray diffraction at 2.2 A resolution. The inhibitor consists of 122 amino acids, with five disulfide bridges, and belongs to the plant alpha-amylase/trypsin inhibitor family. The crystals were grown by the microdialysis method using ammonium sulfate as a precipitating agent. The structure was determined by the molecular-replacement method using as models the structures of Corn Hageman factor inhibitor (CHFI) and of RATI at 2.9 A resolution determined previously. It has been refined to an R factor of 21.9%. The structure shows an r.m.s. deviation for C(alpha) atoms of 2.0 A compared with its own NMR structure, whereas the corresponding value compared with CHFI is found to be 1.4 A. The r.m.s. difference for C(alpha) atoms when compared with the same protein in the structure of the complex with alpha-amylase is 0.7 A. The conformations of trypsin-binding loop and the alpha-amylase-binding N-terminal region were also found to be similar in the crystal structures of native RATI and its complex with alpha-amylase. These regions differed considerably in the NMR structure.
About this Structure
1B1U is a Single protein structure of sequence from Eleusine coracana. This structure supersedes the now removed PDB entry 1JFO. Full crystallographic information is available from OCA.
Reference
Structure of the bifunctional inhibitor of trypsin and alpha-amylase from ragi seeds at 2.2 A resolution., Gourinath S, Alam N, Srinivasan A, Betzel C, Singh TP, Acta Crystallogr D Biol Crystallogr. 2000 Mar;56(Pt 3):287-93. PMID:10713515
Page seeded by OCA on Thu Feb 21 11:50:32 2008
