Primary Citation of Related Structures:   1R8O
PubMed Abstract: 
The crystallographic structure of a novel trypsin inhibitor (CTI) from Copaifera langsdorffii is reported. The structure was solved by MIRAS procedure and refined to a crystallographic residual of 17.3% (R(free) = 20.3%) at 1.8 A resolution. Two isomorphous derivatives were obtained by quick cryo-soaking approach ...
The crystallographic structure of a novel trypsin inhibitor (CTI) from Copaifera langsdorffii is reported. The structure was solved by MIRAS procedure and refined to a crystallographic residual of 17.3% (R(free) = 20.3%) at 1.8 A resolution. Two isomorphous derivatives were obtained by quick cryo-soaking approach. CTI is the first structure of a member of Kunitz (STI) family formed by two noncovalently bound polypeptide chains and only one disulfide bridge. A standard Kunitz-type inhibitor has a single polypeptide chain and two disulfide bridges. Structural features granting CTI high inhibitory activity are discussed.
Related Citations: 
Crystallization and preliminary X-ray diffraction analysis of a novel tryspin inhibitor from seeds of Copaifera langsdorffii Krauchenco, S., Silva, J.A., Nagem, R.A.P., Brando Neto, J.R., Forrer, V.P., Carmona e Ferreira, R., Macedo, M.L.R., Novello, J.C., Marangoni, S., Polikarpov, I. (2001) Acta Crystallogr D Biol Crystallogr 57: 1316
Biochemical characterization and N-terminal sequences of two new trypsin inhibitors from Copaifera langsdorffii seeds da Silva, J.A., Macedo, M.L.R., Novello, J.C., Marangoni, S. (2001) J Protein Chem 20: 1
Organizational Affiliation: 
Grupo de Cristalografia, Department of Physics and Informatics, Institute of Physics (IFSC), University of Sao Paulo, Avenue Trabalhador Saocarlense, 400, CEP 13560-970, Sao Carlos, SP, Brazil.