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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Updated: Aug 10, 2025

Author Spotlight: Evaluating Biophysical Assays for Characterizing PROTACS Ternary Complexes
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Crystallization of VHL-based PROTAC-induced ternary complexes.

Andre J Wijaya1, William Farnaby1, Alessio Ciulli1

  • 1Centre for Targeted Protein Degradation, School of Life Sciences, University of Dundee, Dundee, Scotland, United Kingdom.

Methods in Enzymology
|February 10, 2023
PubMed
Summary

Crystallizing Proteolysis-targeting chimera (PROTAC) ternary complexes is challenging but crucial for understanding protein degradation. Selecting stable PROTACs and using biophysical data improves crystallization success for rational drug design.

Keywords:
CereblonCrystallizationE3 ligasePROTACStructural biologyVHLX-ray crystallography

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Area of Science:

  • Structural biology
  • Chemical biology
  • Drug discovery

Background:

  • X-ray crystal structures of Proteolysis-targeting chimera (PROTAC)-induced ternary complexes offer critical insights into protein degradation mechanisms and selectivity.
  • PROTAC ternary complex crystallization is a significant bottleneck due to inherent flexibility and heterogeneity, hindering rational degrader design.

Purpose of the Study:

  • To outline strategies for overcoming crystallization challenges in PROTAC ternary complex studies.
  • To provide guidelines for selecting PROTACs that form stable, high-affinity, and cooperative ternary complexes.
  • To illustrate the application of biophysical and biochemical data in enhancing ternary complex crystallizability.

Main Methods:

  • Selection of PROTAC compounds forming stable ternary complexes.
  • Utilizing biophysical and biochemical data to guide crystallization efforts.
  • Detailed protocol for VHL-based SMARCA2 PROTAC ternary complex crystallization, including protein expression, purification, complex formation, and crystallization.

Main Results:

  • Demonstration of stable PROTAC-mediated ternary complexes.
  • Identification of key factors influencing ternary complex crystallizability.
  • Successful crystallization of a VHL-based SMARCA2 PROTAC ternary complex.

Conclusions:

  • Stable, high-affinity PROTAC ternary complexes are essential for successful crystallization.
  • Biophysical and biochemical data are valuable for optimizing ternary complex crystallizability.
  • The described protocols can be adapted for various E3 ligase, PROTAC, and target protein combinations.