1r8n
From Proteopedia
The Crystal Structure of the Kunitz (STI) Type Inhibitor from Seeds of Delonix regia
Overview
The three-dimensional structure of a novel Kunitz (STI) family member, an inhibitor purified from Delonix regia seeds (DrTI), was solved by molecular replacement method and refined, respectively, to R(factor) and R(free) values of 21.5% and 25.3% at 1.75A resolution. The structure has a classical beta-trefoil fold, however, differently from canonical Kunitz type (STI) inhibitors, its reactive site loop has an insertion of one residue, Glu68, between the residues P1 and P2. Surprisingly, DrTI is an effective inhibitor of trypsin and human plasma kallikrein, but not of chymotrypsin and tissue kallikrein. Putative structural grounds of such specificity are discussed.
About this Structure
1R8N is a Single protein structure of sequence from Delonix regia. Full crystallographic information is available from OCA.
Reference
Crystal structure of the Kunitz (STI)-type inhibitor from Delonix regia seeds., Krauchenco S, Pando SC, Marangoni S, Polikarpov I, Biochem Biophys Res Commun. 2003 Dec 26;312(4):1303-8. PMID:14652016 Page seeded by OCA on Sat May 3 07:13:20 2008
