4PS1

Caspase-8 specific unnatural amino acid peptides

Summary for 4PS1

• Entry DOI: 10.2210/pdb4ps1/pdb
• Related: 4JJ7 4JJ8 4JJE 4PRY 4PRZ 4PS0
• Descriptor: Caspase-8, (BAL)LQ(HYP)(1U8) PEPTIDE, 2,3-DIHYDROXY-1,4-DITHIOBUTANE, ... (4 entities in total)
• Functional Keywords: protease, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• Biological source: Homo sapiens (human)
• Cellular location: Cytoplasm: Q14790
• Total number of polymer chains: 8
• Total formula weight: 129226.54

Authors

Wolan, D.W.,Vickers, C.J.,Gonzalez-Paez, G.E. (deposition date: 2014-03-06, release date: 2015-01-21, Last modification date: 2023-12-06)

Primary citation

Vickers, C.J.,Gonzalez-Paez, G.E.,Litwin, K.M.,Umotoy, J.C.,Coutsias, E.A.,Wolan, D.W.
Selective inhibition of initiator versus executioner caspases using small peptides containing unnatural amino acids.
Acs Chem.Biol., 9:2194-2198, 2014

PubMed Abstract: Caspases are fundamental to many essential biological processes, including apoptosis, differentiation, and inflammation. Unregulated caspase activity is also implicated in the development and progression of several diseases, such as cancer, neurodegenerative disorders, and sepsis. Unfortunately, it is difficult to determine exactly which caspase(s) of the 11 isoforms that humans express is responsible for specific biological functions. This lack of resolution is primarily due to highly homologous active sites and overlapping substrates. Currently available peptide-based inhibitors and probes are based on specificity garnered from peptide substrate libraries. For example, the canonical tetrapeptide LETD was discovered as the canonical sequence that is optimally recognized by caspase-8; however, LETD-based inhibitors and substrates promiscuously bind to other isoforms with equal affinity, including caspases-3, -6, and -9. In order to mitigate this problem, we report the identification of a new series of compounds that are >100-fold selective for inhibiting the initiator caspases-8 and -9 over the executioner caspases-3, -6, and -7.

PubMed: 25079698
DOI: 10.1021/cb5004256

Experimental method

X-RAY DIFFRACTION (1.731 Å)