SSA1 (Tripartite Motif-containing 21, 52kD Ribonucleoprotein Autoantigen Ro/SS-A, 52kD Ro Protein, RING Finger Protein 81, RNF81, Ro(SS-A), RO52, Sjoegren Syndrome Type A Antigen, SSA, SS-A, TRIM21, Tripartite Motif-containing Protein 21)

TRIM21 (Tripartite motif-containing protein 21; also Ro(SS-A), 52kD Ro Protein/Ro52, and RING finger protein 81) is a 52-56kD member of the RING finger-B-box-coiled-coil family of proteins. It is an E3 ligase that is found in both nucleus and cytoplasm, where it is often associated with microtubules. TRIM21 ubiquitinates select proteins. In B cells, it targets the Fc fragment of misfolded IgG, providing QC on its production. In macrophages, it acts in a nondegradative manner on IRF8, promoting innate immunity. Human TRIM21 is 475aa in length and contains one E3 ligase RING finger domain (aa16-55), a B-Box type zinc-finger region (aa92-123), a coiled-coil region (aa128-238) and a C-terminal PRY/B30.2 Ig binding domain (aa268-465). TRIM21 is reported to form trimers. Over aa195-293, human TRIM21 exhibits 72aa identity with mouse TRIM21.\n\nApplications:\nSuitable for use in Western Blot. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot: 0.5ug/ml \nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nLyophilized powder may be stored at -20 degrees C. Stable for 12 months at -20 degrees C. Reconstitute with PBS. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Reconstituted product is stable for 12 months at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

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