Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At2g30110	Activates ubiquitin by first adenylating its C-terminal glycine residue with ATP, and thereafter linking this residue to the side chain of a cysteine residue in E1, yielding a ubiquitin-E1 thioester and free AMP.	The ubiquitin pathway is required for innate immunity in Arabidopsis.; 2007; DOI: 10.1111/j.1365-313x.2006.02978.x; PMID: 17217463; https://pubmed.ncbi.nlm.nih.gov/17217463/ | The ubiquitin-activating enzyme (E1) gene family in Arabidopsis thaliana.; 1997; DOI: 10.1046/j.1365-313x.1997.11020213.x; PMID: 9076989; https://pubmed.ncbi.nlm.nih.gov/9076989/
Arabidopsis	At5g06460	Activates ubiquitin by first adenylating its C-terminal glycine residue with ATP, and thereafter linking this residue to the side chain of a cysteine residue in E1, yielding a ubiquitin-E1 thioester and free AMP.	The ubiquitin-activating enzyme (E1) gene family in Arabidopsis thaliana.; 1997; DOI: 10.1046/j.1365-313x.1997.11020213.x; PMID: 9076989; https://pubmed.ncbi.nlm.nih.gov/9076989/