RBMY1F

Model summary

A nuclear RNA-binding protein that assembles into higher-order ribonucleoprotein complexes to regulate germline RNA metabolism. Its N-terminal RNA-recognition module captures target RNAs, while a self-association-prone C-terminal region promotes homo-oligomerization and granule assembly. By organizing RNA handling within the nucleus—particularly in nucleoplasmic and nucleolar hubs—it supports the RNA programs that drive spermatogenesis and male gonad development.

Predicted Gene Ontology terms

1. 01

   I begin with the InterPro architecture.

   The N-terminus contains IPR012677 (Nucleotide-binding alpha-beta plait domain superfamily, residues 2–123), a structural scaffold frequently used to support nucleic-acid–binding folds. Nested within this region is IPR035979 (RNA-binding domain superfamily, residues 6–115) and, more specifically, IPR000504 (RNA recognition motif domain, residues 8–85). This layered arrangement establishes a canonical RRM core that binds single-stranded RNA through conserved RNP motifs. The overall family assignment IPR050441 (RNA-binding motif, residues 3–251) extends across most of the polypeptide, indicating that RNA interaction is the dominant biochemical theme. Toward the C-terminus, IPR012604 (RBM1CTR, residues 174–218) provides a specialized tail typical of RBM1-class proteins; such low-complexity C-terminal regions often mediate homo-oligomerization and assembly into ribonucleoprotein (RNP) complexes.

2. 02

   This domain architecture causally dictates molecular function.

   The RRM-centered core (IPR000504 within IPR035979/IPR012677) confers high-affinity RNA recognition and packaging, while the RBM1CTR tail promotes self-association. Together, these features produce two complementary activities: RNA binding and identical protein binding. The latter aligns with GO:0042802 identical protein binding, as oligomerization via the C-terminal region stabilizes higher-order RNP assemblies.

3. 03

   From molecular function to biological process, RNA-binding and self-association equip the protein to regulate germline-specific RNA metabolism.

   In the male lineage, selective RNA handling underpins spermatogonial specification, meiotic progression, and haploid maturation. By assembling and stabilizing RNPs that govern transcript processing and storage, the protein supports GO:0007283 spermatogenesis and GO:0008584 male gonad development. The RRM-driven RNA chaperoning provides the mechanistic bridge between RNA handling and these developmental outcomes.

4. 04

   Cellular localization follows directly from the RNP lifecycle.

   The presence of an RRM core and assembly-prone C-terminus predicts nucleic-acid–associated compartments. The nucleoplasm is the primary venue for pre-mRNA processing and RNP assembly, consistent with GO:0005654 nucleoplasm. The nucleolus (GO:0005730 nucleolus) frequently serves as a dynamic hub for RNP biogenesis and RNA quality control; transient nucleolar residency is therefore expected for RNA-binding assemblies. The experimentally observed nuclear localization is a coherent outcome of this soluble, non-membranous architecture.

5. 05

   Mechanistically, I propose that the N-terminal RRM binds target RNAs and recruits them into higher-order assemblies via the RBM1CTR-mediated oligomerization.

   This causes formation of stable RNP granules that modulate RNA availability and translation during germ cell differentiation. Likely interaction partners include nuclear RNP factors and transport adaptors that coordinate RNA maturation and trafficking. Homo-oligomerization (identical protein binding) nucleates these assemblies, while selective RNA engagement tunes their composition to the demands of spermatogenesis and male gonad development.