Proteomic analysis of interleukin enhancer binding factor 3 (Ilf3) and nuclear factor 90 (NF90) interactome

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Interleukin enhancer binding factor 3 (Ilf3) and Nuclear Factor 90 (NF90) are proteins derived from the ILF3 gene.
• Their precise functions are not fully understood, despite being known as RNA binding proteins involved in various cellular processes.
• Their roles are influenced by interacting partners, protein complexes, and cellular location.

Purpose of the Study:

• To investigate the protein partners of Ilf3 and NF90.
• To elucidate the functions of Ilf3 and NF90 in cellular phenomena.
• To establish a link between Ilf3/NF90 functions and their interacting proteins.

Main Methods:

• Affinity chromatography was employed to identify protein partners.
• Analysis of protein interactions with double-stranded RNA binding motifs.
• Characterization of protein complexes involving Ilf3 and NF90.

Main Results:

• Six novel protein partners interacting with Ilf3 and NF90 were identified: hnRNP A/B, hnRNP A2/B1, hnRNP A3, hnRNP D, hnRNP Q, and PSF.
• These hnRNP proteins are involved in mRNA stabilization, transport, and translation regulation.
• PSF was identified as a splicing factor.
• Ilf3, NF90, and most identified partners exist in large molecular complexes.

Conclusions:

• The identified partners and their known functions suggest a role for Ilf3 and NF90 in mRNA metabolism.
• This study links the RNA binding capabilities of Ilf3 and NF90 to the functions of their interacting partners.
• Further research into these interactions can clarify the complex cellular roles of Ilf3 and NF90.