Characterization of functional disordered regions within chromatin-associated proteins.

Intrinsically disordered regions (IDRs) are abundant and play important roles in the function of chromatin-associated proteins (CAPs). These regions are often found at the N- and C-termini of CAPs and between structured domains, where they can act as more than just linkers, directly contributing to function. IDRs have been shown to contribute to substrate binding, act as auto-regulatory regions, and drive liquid-liquid droplet formation. Their disordered nature provides increased functional diversity and allows them to be easily regulated through post-translational modification. However, these regions can be especially challenging to characterize on a structural level. Here, we review the prevalence of IDRs in CAPs, highlighting several studies that address their importance in CAP function and show progress in structural characterization of these regions. A focus is placed on the unique opportunity to apply nuclear magnetic resonance (NMR) spectroscopy alongside cryo-electron microscopy to characterize IDRs in CAPs.