PXD047138-1

PXD047138 is an original dataset announced via ProteomeXchange.

Title	Template-assisted covalent modification of DCAF16 underlies activity of BRD4 molecular glue degraders
Description	Small molecules that induce protein-protein interactions to exert proximity-driven pharmacology such as targeted protein degradation are a powerful class of therapeutics1-3. Molecular glues are of particular interest given their favorable size and chemical properties and represent the only clinically approved degrader drugs4-6. The discovery and development of molecular glues for novel targets, however, remains challenging. Covalent strategies could in principle facilitate molecular glue discovery by stabilizing the neo-protein interfaces. Here, we present structural and mechanistic studies that define a trans-labeling covalent molecular glue mechanism, which we term “template-assisted covalent modification”. We found that a novel series of BRD4 molecular glue degraders act by recruiting the CUL4DCAF16 ligase to the second bromodomain of BRD4 (BRD4BD2). BRD4BD2, in complex with DCAF16, serves as a structural template to facilitate covalent modification of DCAF16, which stabilizes the BRD4-degrader-DCAF16 ternary complex formation and facilitates BRD4 degradation. A 2.2 Å cryo-electron microscopy structure of the ternary complex demonstrates that DCAF16 and BRD4BD2 have pre-existing structural complementarity which optimally orients the reactive moiety of the degrader for DCAF16Cys58 covalent modification. Systematic mutagenesis of both DCAF16 and BRD4BD2 revealed that the loop conformation around BRD4His437, rather than specific side chains, is critical for BD2 selectivity. Supporting a general applicability, we find that a subset of compounds leads to a drug-induced GAK-BRD4 interaction stabilized by covalent modification of GAK. Together our work establishes “template-assisted covalent modification” as a mechanism for covalent molecular glues, which opens a new path to proximity driven pharmacology.
HostingRepository	PRIDE
AnnounceDate	2024-08-09
AnnouncementXML	Submission_2024-08-09_06:01:23.943.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Eric Fischer
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	iodoacetamide derivatized residue
Instrument	timsTOF Pro 2

Revision	Datetime	Status	ChangeLog Entry
0	2023-11-21 13:42:41	ID requested
⏵ 1	2024-08-09 06:01:24	announced

10.1038/s41589-024-01668-4;

Li YD, Ma MW, Hassan MM, Hunkeler M, Teng M, Puvar K, Rutter JC, Lumpkin RJ, Sandoval B, Jin CY, Schmoker AM, Ficarro SB, Cheong H, Metivier RJ, Wang MY, Xu S, Byun WS, Groendyke BJ, You I, Sigua LH, Tavares I, Zou C, Tsai JM, Park PMC, Yoon H, Majewski FC, Sperling HT, Marto JA, Qi J, Nowak RP, Donovan KA, S, ł, abicki M, Gray NS, Fischer ES, Ebert BL, Template-assisted covalent modification underlies activity of covalent molecular glues. Nat Chem Biol, ():(2024) [pubmed]

submitter keyword: DCAF16, JQ1, Molecular glue, degrader, bromodomain, template-assisted

Eric Fischer
contact affiliation	Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA., Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
contact email	eric_fischer@dfci.harvard.edu
lab head
Eric Fischer
contact affiliation	Dana-Farber Cancer Institute
contact email	eric_fischer@dfci.harvard.edu
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD047138
     1. Label: PRIDE project
     2. Name: Template-assisted covalent modification of DCAF16 underlies activity of BRD4 molecular glue degraders