Prion formation by a yeast GLFG nucleoporin

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Protein self-assembly into higher-order structures is vital in biology and disease.
• Yeast (Saccharomyces cerevisiae) utilizes glutamine/asparagine (Q/N)-rich proteins forming self-replicating amyloid-like polymers called prions for inheritance.
• Nuclear pore complex (NPC) proteins, rich in Q/N, are hypothesized to self-assemble, influencing NPC structure and function.

Purpose of the Study:

• To investigate the role of repeating GLFG motifs in Q/N-rich proteins.
• To determine if these proteins can form prions.
• To explore the implications for nuclear pore complex (NPC) function and protein-based inheritance.

Main Methods:

• Analysis of GLFG motifs in Q/N-rich proteins.
• Induction and characterization of amyloid formation.
• In vivo studies of prion formation in yeast.

Main Results:

• Repeating GLFG motifs were identified as a key feature promoting amyloid self-assembly with prion characteristics.
• Nup100, a yeast GLFG nucleoporin, was shown to form bona fide prions in vivo.
• This establishes a novel prion-forming capability for yeast GLFG nucleoporins.

Conclusions:

• The GLFG motif is a critical determinant for prion-like amyloid formation in Q/N-rich proteins.
• Yeast nucleoporins, like Nup100, possess the ability to form prions.
• This finding expands our understanding of protein-based inheritance and the functional roles of nucleoporins.