The protein lipidation process by which phosphatidylethanolamine is conjugated to a protein of the ATG8 family, leading to membrane insertion of the protein as a step in autophagosome assembly. [ http://www.ncbi.nlm.nih.gov/pubmed/11100732 http://www.ncbi.nlm.nih.gov/pubmed/11096062 http://www.ncbi.nlm.nih.gov/pubmed/15277523 ]