The crystal structure of pyroglutamyl peptidase I from Bacillus amyloliquefaciens reveals a new structure for a cysteine protease.
Odagaki, Y., Hayashi, A., Okada, K., Hirotsu, K., Kabashima, T., Ito, K., Yoshimoto, T., Tsuru, D., Sato, M., Clardy, J.(1999) Structure 7: 399-411
- PubMed: 10196127 
- DOI: https://doi.org/10.1016/s0969-2126(99)80053-7
- Primary Citation of Related Structures:  
1AUG - PubMed Abstract: 
The N-terminal pyroglutamyl (pGlu) residue of peptide hormones, such as thyrotropin-releasing hormone (TRH) and luteinizing hormone releasing hormone (LH-RH), confers resistance to proteolysis by conventional aminopeptidases. Specialized pyroglutamyl peptidases (PGPs) are able to cleave an N-terminal pyroglutamyl residue and thus control hormonal signals. Until now, no direct or homology-based three-dimensional structure was available for any PGP.
Organizational Affiliation: 
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA.