We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDual E1 activation systems for ubiquitin differentially regulate E2 enzyme charging.AuthorsJianping Jin; Xue Li; Gygi, Steven P.; Harper, J. WadePublicationNature, 2007, Vol 447, Issue 7148, p1135ISSN0028-0836Publication typearticleDOI10.1038/nature05902