Intranuclear dynamics of the Nup107-160 complex

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Nup98 is a nucleoporin involved in nuclear transport and gene regulation.
• Nup98 localizes to intranuclear structures called GLFG bodies.
• The Nup107-160 complex (Y-complex) is a key scaffold of the nuclear pore.

Purpose of the Study:

• To investigate the colocalization of the Y-complex and Elys with Nup98 in GLFG bodies.
• To understand the dynamics and regulation of GLFG bodies during the cell cycle.
• To explore potential novel functions of the Y-complex within the nucleus.

Main Methods:

• Immunofluorescence microscopy to visualize Nup98, Y-complex, and Elys.
• Analysis of GLFG body frequency and size in relation to Nup98 levels.
• Fluorescence Recovery After Photobleaching (FRAP) to study Y-complex dynamics.
• Cell cycle analysis to observe GLFG body behavior during mitosis.

Main Results:

• The Y-complex and Elys colocalize with Nup98 in GLFG bodies.
• GLFG body formation and size correlate with Nup98 levels.
• Y-complex and Elys recruitment to GLFG bodies depends on Nup98's C-terminal domain.
• GLFG bodies disassemble during mitotic prophase, preceding nuclear pore disassembly.
• The Y-complex exhibits dynamic shuttling into and out of GLFG bodies, distinct from nuclear pore behavior.
• A fraction of Nup107 within the nucleoplasm shows reduced mobility, indicating nuclear interactions.

Conclusions:

• Nup98 interacts with the Y-complex and Elys within GLFG bodies.
• GLFG bodies represent a dynamic intranuclear compartment for nucleoporins.
• The Y-complex has a previously unrecognized intranuclear pool with potential roles in gene regulation.
• These findings suggest novel functions for nucleoporins beyond nuclear pore complex structure and transport.