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. 2002 Feb 8;108(3):345-56.
doi: 10.1016/s0092-8674(02)00630-x.

Structural Basis for E2-mediated SUMO Conjugation Revealed by a Complex Between Ubiquitin-Conjugating Enzyme Ubc9 and RanGAP1

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Structural Basis for E2-mediated SUMO Conjugation Revealed by a Complex Between Ubiquitin-Conjugating Enzyme Ubc9 and RanGAP1

Victor Bernier-Villamor et al. Cell. .
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Abstract

E2 enzymes catalyze attachment of ubiquitin and ubiquitin-like proteins to lysine residues directly or through E3-mediated reactions. The small ubiquitin-like modifier SUMO regulates nuclear transport, stress response, and signal transduction in eukaryotes and is essential for cell-cycle progression in yeast. In contrast to most ubiquitin conjugation, the SUMO E2 enzyme Ubc9 is sufficient for substrate recognition and lysine modification of known SUMO targets. Crystallographic analysis of a complex between mammalian Ubc9 and a C-terminal domain of RanGAP1 at 2.5 A reveals structural determinants for recognition of consensus SUMO modification sequences found within SUMO-conjugated proteins. Structure-based mutagenesis and biochemical analysis of Ubc9 and RanGAP1 reveal distinct motifs required for substrate binding and SUMO modification of p53, IkappaBalpha, and RanGAP1.

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