5yj0 | pdb_00005yj0
MOUSE CEREBLON S form
Structural highlights
Function[CRBN_MOUSE] Component of some DCX (DDB1-CUL4-X-box) E3 protein ligase complex, a complex that mediates the ubiquitination and subsequent proteasomal degradation of target proteins and is required for limb outgrowth and expression of the fibroblast growth factor FGF8. In the complex, may act as a substrate receptor. Regulates the assembly and neuronal surface expression of large-conductance calcium-activated potassium channels in brain regions involved in memory and learning via its interaction with KCNT1 (By similarity). Publication Abstract from PubMedThalidomide possesses two optical isomers which have been reported to exhibit different pharmacological and toxicological activities. However, the precise mechanism by which the two isomers exert their different activities remains poorly understood. Here, we present structural and biochemical studies of (S)- and (R)-enantiomers bound to the primary target of thalidomide, cereblon (CRBN). Our biochemical studies employed deuterium-substituted thalidomides to suppress optical isomer conversion, and established that the (S)-enantiomer exhibited ~10-fold stronger binding to CRBN and inhibition of self-ubiquitylation compared to the (R)-enantiomer. The crystal structures of the thalidomide-binding domain of CRBN bound to each enantiomer show that both enantiomers bind the tri-Trp pocket, although the bound form of the (S)-enantiomer exhibited a more relaxed glutarimide ring conformation. The (S)-enantiomer induced greater teratogenic effects on fins of zebrafish compared to the (R)-enantiomer. This study has established a mechanism by which thalidomide exerts its effects in a stereospecific manner at the atomic level. Structural basis of thalidomide enantiomer binding to cereblon.,Mori T, Ito T, Liu S, Ando H, Sakamoto S, Yamaguchi Y, Tokunaga E, Shibata N, Handa H, Hakoshima T Sci Rep. 2018 Jan 22;8(1):1294. doi: 10.1038/s41598-018-19202-7. PMID:29358579[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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