2.3.2.23	1111	The ubiquitin-activating enzyme (E1) gene family in Arabidopsis thaliana	Plant J.	11	213-226	1997	Arabidopsis thaliana	https://pubmed.ncbi.nlm.nih.gov/9076989/	
2.3.2.23	674561	Pleiotropic effects of ATP*Mg2+ binding in the catalytic cycle of ubiquitin-activating enzyme	J. Biol. Chem.	281	14729-14737	2006	Homo sapiens	https://pubmed.ncbi.nlm.nih.gov/16595681/	
2.3.2.23	674842	UBE1L2, a novel E1 enzyme specific for ubiquitin	J. Biol. Chem.	282	23010-23014	2007	Homo sapiens	https://pubmed.ncbi.nlm.nih.gov/17580310/	
2.3.2.23	691518	Interactions between the quality control ubiquitin ligase CHIP and ubiquitin conjugating enzymes	BMC Struct. Biol.	8	26	2008	Danio rerio	https://pubmed.ncbi.nlm.nih.gov/18485199/	
2.3.2.23	709881	Expression, purification and characterization of human ubiquitin-activating enzyme, UBE1	Mol. Biol. Rep.	37	1413-1419	2010	Homo sapiens	https://pubmed.ncbi.nlm.nih.gov/19343538/	
2.3.2.23	715517	The ubiquitin-conjugating enzyme UbcM2 can regulate the stability and activity of the antioxidant transcription factor Nrf2	J. Biol. Chem.	285	23064-23074	2010	Homo sapiens	https://pubmed.ncbi.nlm.nih.gov/20484052/	
2.3.2.23	716288	Identification of testis-specific ubiquitin-conjugating enzyme in the ascidian Ciona intestinalis	Mol. Reprod. Dev.	77	640-647	2010	Ciona intestinalis	https://pubmed.ncbi.nlm.nih.gov/20578064/	
2.3.2.23	723874	The expression, purification and crystallization of a ubiquitin-conjugating enzyme E2 from Agrocybe aegerita underscore the impactof His-tag location on recombinant protein properties	Acta Crystallogr. Sect. F	69	153-157	2013	Cyclocybe aegerita	https://pubmed.ncbi.nlm.nih.gov/23385757/	
2.3.2.23	724951	The family of ubiquitin-conjugating enzymes (E2s):deciding between life and death of proteins	FASEB J.	24	981-93	2010	Homo sapiens	https://pubmed.ncbi.nlm.nih.gov/19940261/	
2.3.2.23	725413	The E2 ubiquitin-conjugating enzymes direct polyubiquitination to preferred lysines	J. Biol. Chem.	285	8595-8604	2010	Homo sapiens	https://pubmed.ncbi.nlm.nih.gov/20061386/