SUD1 Antibody

Introduction to SUD1 Protein

SUD1 is a conserved eukaryotic protein with diverse roles across species, including involvement in ubiquitin-mediated proteolysis, ribosomal function, and stress response regulation. Its functional characterization often relies on antibody-based tools for detection and interaction studies. Below, we synthesize findings from multiple studies to outline SUD1’s biological roles and the antibodies used in its investigation.

SUD1 in Fission Yeast (Schizosaccharomyces pombe)

• Function:
  SUD1 interacts with Cdc18, a key regulator of DNA replication, and mediates its proteolysis via ubiquitination. This interaction requires phosphorylation of Cdc18 by cyclin-dependent kinases (CDKs) .

• Antibody Applications:

  • HA-tagged SUD1 was used in co-immunoprecipitation (Co-IP) assays to confirm its binding to ubiquitinated proteins and Cdc18 .

  • Anti-HA monoclonal antibodies (e.g., 12CA5) detected SUD1 in immunoblots and precipitated ubiquitin-conjugated complexes .

SUD1 in Arabidopsis thaliana

• Function:
  SUD1 acts as an E3 ubiquitin ligase regulating 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) activity, critical for sterol biosynthesis. Mutations in SUD1 suppress developmental defects in dry2 mutants .

• Structural Insights:

  • Topological modeling predicts SUD1’s RING domain faces the cytosol, similar to yeast Doa10 .

  • Four sud1 alleles (e.g., sud1-1 to sud1-4) were identified, revealing conserved residues across plant species .

SUD1 in Drosophila melanogaster

• Function:
  Sud1 hydroxylates Pro-62 of ribosomal protein RPS23, influencing translation efficiency and stress responses. Knockdown triggers unfolded protein response (UPR), autophagy, and apoptosis .

• Detection Methods:

  • Sud1-GFP fusions localized the protein to the nucleus and cytoplasm using fluorescence microscopy .

  • RNAi silencing studies linked Sud1 to growth defects and stress granule formation .

Research Tools: Antibodies and Detection Methods