5MEV

MCL1 FAB COMPLEX IN COMPLEX WITH COMPOUND 21

Summary for 5MEV

• Entry DOI: 10.2210/pdb5mev/pdb
• Related: 5KU9 5MES
• Descriptor: Induced myeloid leukemia cell differentiation protein Mcl-1 homolog,Induced myeloid leukemia cell differentiation protein Mcl-1, Fab Heavy Chain, Fab Light Chain, ... (5 entities in total)
• Functional Keywords: mcl1 fab macrocycle, mcl1-fab_55_c6his, immune system
• Biological source: Mus musculus (Mouse); More
• Cellular location: Membrane ; Single-pass membrane protein : Q07820
• Total number of polymer chains: 3
• Total formula weight: 67630.29

Authors

Hargreaves, D. (deposition date: 2016-11-16, release date: 2017-01-18, Last modification date: 2024-10-09)

Primary citation

Johannes, J.W.,Bates, S.,Beigie, C.,Belmonte, M.,Breen, J.,Cao, S.,Centrella, P.A.,Clark, M.A.,Cuozzo, J.W.,Dumelin, C.E.,Ferguson, A.D.,Habeshian, S.,Hargreaves, D.,Joubran, C.,Kazmirski, S.,Keefe, A.,Lamb, M.L.,Lan, H.,Li, Y.,Ma, H.,Mlynarski, S.,Packer, M.J.,Rawlins, P.,Robbins, D.W.,Shen, H.,Sigel, E.A.,Soutter, H.H.,Su, N.,Trost, D.M.,Wang, H.,Wickson, K.F.,Wu, C.,Zhang, Y.,Zhao, Q.,Zheng, X.,Hird, A.
Structure Based Design of Non-Natural Peptidic Macrocyclic Mcl-1 Inhibitors
Acs Med.Chem.Lett., 8:239-244, 2017

PubMed Abstract: Mcl-1 is a pro-apoptotic BH3 protein family member similar to Bcl-2 and Bcl-xL. Overexpression of Mcl-1 is often seen in various tumors and allows cancer cells to evade apoptosis. Here we report the discovery and optimization of a series of non-natural peptide Mcl-1 inhibitors. Screening of DNA-encoded libraries resulted in hit compound , a 1.5 μM Mcl-1 inhibitor. A subsequent crystal structure demonstrated that compound bound to Mcl-1 in a β-turn conformation, such that the two ends of the peptide were close together. This proximity allowed for the linking of the two ends of the peptide to form a macrocycle. Macrocyclization resulted in an approximately 10-fold improvement in binding potency. Further exploration of a key hydrophobic interaction with Mcl-1 protein and also with the moiety that engages Arg256 led to additional potency improvements. The use of protein-ligand crystal structures and binding kinetics contributed to the design and understanding of the potency gains. Optimized compound is a <3 nM Mcl-1 inhibitor, while inhibiting Bcl-2 at only 5 μM and Bcl-xL at >99 μM, and induces cleaved caspase-3 in MV4-11 cells with an IC of 3 μM after 6 h.

PubMed: 28197319
DOI: 10.1021/acsmedchemlett.6b00464

Experimental method

X-RAY DIFFRACTION (2.94 Å)