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Dissecting the functional divergence of DCAF11 isoforms in protein degradation

Xiaokang Jin1, Xiaoyu Zhang1,2,3,4,5

  • 1Department of Chemistry, Northwestern University Evanston Illinois 60208 USA zhang@northwestern.edu.

RSC Chemical Biology
|July 17, 2026
PubMed

Insights

DCAF11 protein isoforms 1 and 2 are similar in CRL4 complex assembly and substrate targeting. However, they differ in their interaction with small-molecule degraders, enabling isoform-selective protein degradation strategies.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • DCAF11 acts as a substrate receptor for the CRL4 ubiquitin ligase complex.
  • DCAF11 has two major isoforms with poorly understood functional distinctions.
  • Targeted protein degradation is a key cellular process.

Purpose of the Study:

  • To investigate the functional differences between DCAF11 isoforms 1 and 2.
  • To explore how these isoforms interact with different types of small-molecule degraders.
  • To understand isoform-dependent control in targeted protein degradation.

Main Methods:

  • Assessing CRL4 complex assembly efficiency for both DCAF11 isoforms.
  • Analyzing endogenous substrate profiles of DCAF11 isoforms.
  • Evaluating the engagement of covalent PROTACs and non-covalent molecular glues with DCAF11 isoforms.

Main Results:

  • Both DCAF11 isoforms efficiently assemble into CRL4 complexes.
  • Isoforms 1 and 2 share overlapping substrate profiles, including electrophile detoxification proteins.
  • Covalent PROTACs engage both isoforms, while non-covalent molecular glues selectively target isoform 1.

Conclusions:

  • DCAF11 isoforms exhibit isoform-dependent control over protein degradation.
  • Isoform-selective targeting of DCAF11 presents new therapeutic opportunities.
  • Understanding isoform differences is crucial for developing targeted protein degradation therapies.

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