Isoform 2 inhibits the ubiquitin ligase activity of SIAH1 and inhibits proteasomal degradation of target proteins. Isoform 2 inhibits autoubiquitination and proteasomal degradation of SIAH1, and thereby increases cellular levels of SIAH. Isoform 2 modulates SNCA monoubiquitination by SIAH1.
Specificity
Natural and recombinant Human Synphilin-1
Subcellular Location
Cytoplasm Detected in cytoplasmic inclusion bodies, together with SNCA.
Homodimer (Probable). Heterodimer of isoform 1 and isoform 2 (Probable). Interacts with SIAH1, SIAH2, SNCA, RNF19A AND PARK2. Isoform 2 has a strong tendency to form aggregates and can sequester isoform 1.