RING fingers mediate ubiquitin-conjugating enzyme (E2)-dependent ubiquitination

Kevin L. Lorick1, Jane Jensen1, Shengyun Fang1, Albert M. Ong1, Shigetsugu Hatakeyama1, Allan M. Weissman1
1Laboratory of Immune Cell Biology, Division of Basic Sciences, National Cancer Institute, Building 10, Room 1B34, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892-1152

Tóm tắt

A RING finger-containing protein (AO7) that binds ubiquitin-conjugating enzymes (E2s) and is a substrate for E2-dependent ubiquitination was identified. Mutations of cation-coordinating residues within AO7’s RING finger abolished ubiquitination, as did chelation of zinc. Several otherwise-unrelated RING finger proteins, including BRCA1, Siah-1, TRC8, NF-X1, kf-1, and Praja1, were assessed for their ability to facilitate E2-dependent ubiquitination. In all cases, ubiquitination was observed. The RING fingers were implicated directly in this activity through mutations of metal-coordinating residues or chelation of zinc. These findings suggest that a large number of RING finger-containing proteins, with otherwise diverse structures and functions, may play previously unappreciated roles in modulating protein levels via ubiquitination.

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