Protein ubiquitination and deubiquitination is a reversible process catalyzed by ubiquitinating enzymes (UBEs) and deubiquitinating enzymes (1,2). Deubiquitinating enzymes (DUBs) function as ubiquitin-specific proteases and can be divided into five subfamilies based on catalytic domain structure. At least 14 members of the JAMM ubiquitin protease subfamily have been identified, including signal transducing adaptor molecule (STAM) binding protein (3). STAM-binding protein (STAMBP or AMSH) is an endosomal DUB that preferentially displays ubiquitin isopeptidase activity toward K63-linked chains, which is critically dependent upon its interaction with STAM (4,5). STAMBP interacts with the STAM adaptor protein and becomes integrated into the multivesicular body sorting machinery to help regulate endosomal trafficking and receptor tyrosine kinase stability by deubiquitining target proteins (4,6). Evidence indicates that endosomal STAMBP antagonizes the ubiquitin-dependent trafficking of EGFR to the lysosomal compartment (7).
Applications:
Suitable for use in Western Blot and Immunoprecipitation. Other applications not tested.
Recommended Dilution:
Western Blot: 1:1000
Immunoprecipitation: 1:50
Optimal dilutions to be determined by the researcher.
Storage and Stability:
May be stored at 4 degrees C for short-term only. For long-term storage and to avoid repeated freezing and thawing, aliquot and store at -20 degrees C. Aliquots are stable for at least 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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