Autophagin-2 (IPR033474)

Short name: ATG4A

Overlapping homologous superfamilies

Family relationships


Autophagin-2 (ATG4A, MEROPS identifier C54.002) is a cysteine endopeptidase required for autophagy, an intracellular degradation system found only in eukaryotes [PMID: 19491929, PMID: 20811353]. Once induced, double membrane-bound vesicles called autophagosomes engulf cytoplasm, even whole organelles and invading bacteria, and deliver them to the lysosome for degradation. Autophagins cleave proteins required for autophagosome development, such as gamma-aminobutyric acid receptor-associated protein (GABARAP), gamma-aminobutyric acid receptor-associated protein-like 2 (GATE-16), and microtubule-associated protein light chain 3 (LC3). GABARAP and GATE-16 seem to be better substrates than LC3B for ATG4A [PMID: 12473658, PMID: 15169837, PMID: 21177865].

GO terms

Biological Process

GO:0006914 autophagy

Molecular Function

GO:0004197 cysteine-type endopeptidase activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.