Protein motion in the nucleus: from anomalous diffusion to weak interactions.

Area of Science:

• Cell Biology
• Molecular Biology
• Biophysics

Background:

• Transcription factors (TFs) are crucial for regulating gene expression in mammals.
• TF diffusion and target site binding occur within the highly organized and dynamic mammalian nucleoplasm.
• Nuclear organization, including biomolecule interactions and nuclear landscape, dictates TF-DNA interactions and gene regulation.

Purpose of the Study:

• To review the relationship between TF anomalous diffusion and nuclear organization.
• To propose that transient interactions with dynamic nuclear substructures cause anomalous diffusion.
• To highlight the benefit of improved nuclear substructure descriptions for analyzing SPT data.

Main Methods:

• Review of existing literature on TF diffusion, nuclear organization, and anomalous diffusion.
• Analysis of single-particle tracking (SPT) data in the context of nuclear structures.
• Connecting microscopic interactions to macroscopic diffusion behaviors.

Main Results:

• Anomalous diffusion is a common observation for TFs in the nucleus.
• Nuclear substructures, such as topologically associated domains and phase-separated compartments, influence TF movement.
• Weak and transient interactions with dynamic nuclear substructures are proposed as the cause of anomalous diffusion.

Conclusions:

• Anomalous diffusion in SPT data reflects TF interactions with dynamic nuclear substructures.
• A better understanding of nuclear substructures can enhance the analysis of TF diffusion.
• This research bridges the gap between microscopic nuclear organization and TF dynamics.