The 2.0 A crystal structure and substrate specificity of the KDEL-tailed cysteine endopeptidase functioning in programmed cell death of Ricinus communis endosperm.
Than, M.E., Helm, M., Simpson, D.J., Lottspeich, F., Huber, R., Gietl, C.(2004) J Mol Biol 336: 1103-1116
- PubMed: 15037072 
- DOI: 10.1016/j.jmb.2003.12.075
- Primary Citation of Related Structures:  
1S4V - PubMed Abstract: 
In the senescing endosperm of germinating castor bean (Ricinus communis) a special organelle (the ricinosome) releases a papain-type cysteine endopeptidase (CysEP) during the final stages of cellular disintegration. Protein cleavage sites for the Ricinus CysEP were determined with fluorogenic peptides (Abz-Xaa-Arg-/-Gln-Gln-Tyr(NO2)-Asp) ...