E3 ubiquitin-protein ligase that ubiquitinates Beclin-1/BECN1 in a 'Lys-63'-dependent manner enhancing its binding to ULK1. In turn, promotes starvation-induced autophagy activation. Interacts also with p62/SQSTM1 protein and thereby induces the formation and the autophagy clearance of aggresome-associated polyubiquitinated proteins through HDAC6 interaction. S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine + [acceptor protein]-L-lysine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + N(6)-ubiquitinyl-[acceptor protein]-L-lysine. Can form dimers and trimers. Interacts with several E2 ubiquitin-conjugating enzymes, including UBE2L6, UBE2E1, UBE2E3. No interaction with UBE2H. Interacts with BECN1. Interacts with SQSTM1. Localizes mainly into discrete cytoplasmic punctuate structures heterogeneous in size and shape containing polyubiquitinated proteins. Expressed in the stomach. Auto-ubiquitinated. Acetylated by EP300 and KAT2B. HDAC6 drives TRIM50 deacetylation. Acetylation antagonizes with TRIM50 ubiquitination. Belongs to the TRIM/RBCC family.