Anti-APG4B

APG4B (autophagy related 4B, cysteine peptidase) belongs to autophagin protein family. APG4B splits the C-terminal amino acid of ATG8 family proteins, MAP1LC3, GABARAPL1, GABARAPL2 and GABARAP, to reveal a C-terminal glycine. It has 393 aminoacids recidues. It has 5 isoforms produced by alternative transcriptional splicing. APG4B is mainly expressed in the skeletal muscle, brain, heart, liver and pancreas. It is a Cysteine protease needed for the cytoplasm to vacuole transport (Cvt) and autophagy. APG4B mainly expressed in the skeletal muscle, followed by brain, heart, liver and pancreas. Protein function: Cysteine protease required for the cytoplasm to vacuole transport (Cvt) and autophagy. Cleaves the C-terminal amino acid of ATG8 family proteins MAP1LC3, GABARAPL1, GABARAPL2 and GABARAP, to reveal a C-terminal glycine. Exposure of the glycine at the C- terminus is essential for ATG8 proteins conjugation to phosphatidylethanolamine (PE) and insertion to membranes, which is necessary for autophagy. Has also an activity of delipidating enzyme for the PE-conjugated forms. [The UniProt Consortium]