Three-dimensional structure of carboxypeptidase T from Thermoactinomyces vulgaris in complex with N-BOC-L-leucine.
Timofeev, V.I., Kuznetsov, S.A., Akparov, V.K.h., Chestukhina, G.G., Kuranova, I.P.(2013) Biochemistry (Mosc) 78: 252-259
- PubMed: 23586718 
- DOI: https://doi.org/10.1134/S0006297913030061
- Primary Citation of Related Structures:  
4F8Z - PubMed Abstract: 
The 3D structure of recombinant bacterial carboxypeptidase T (CPT) in complex with N-BOC-L-leucine was determined at 1.38 Å resolution. Crystals for the X-ray study were grown in microgravity using the counter-diffusion technique. N-BOC-L-leucine and SO4(2-) ion bound in the enzyme active site were localized in the electron density map. Location of the leucine side chain in CPT-N-BOC-L-leucine complex allowed identification of the S1 subsite of the enzyme, and its structure was determined. Superposition of the structures of CPT-N-BOC-L-leucine complex and complexes of pancreatic carboxypeptidases A and B with substrate and inhibitors was carried out, and similarity of the S1 subsites in these three carboxypeptidases was revealed. It was found that SO4(2-) ion occupies the same position in the S1' subsite as the C-terminal carboxy group of the substrate.
Organizational Affiliation: 
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, Russia. inna@ns.crys.ras.ru