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In Vitro Assembly and Recognition of Lys-63 Polyubiquitin Chains

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Hofmann, Roseanne M., Pickart, Cecile M.·2001·Journal of Biological Chemistry

Abstract

Polyubiquitin chains assembled through lysine 48 (Lys-48) of ubiquitin act as a signal for substrate proteolysis by 26 S proteasomes, whereas chains assembled through Lys-63 play a mechanistically undefined role in post-replicative DNA repair. We showed previously that the products of the UBC13 and MMS2 genes function in error-free post-replicative DNA repair in the yeast Saccharomyces cerevisiae and form a complex that assembles Lys-63-linked polyubiquitin chains in vitro. Here we confirm that the Mms2.Ubc13 complex functions as a high affinity heterodimer in the chain assembly reaction in vitro and report the results of a kinetic characterization of the polyubiquitin chain assembly reaction. To test whether a Lys-63-linked polyubiquitin chain can signal degradation, we conjugated Lys-63-linked tetra-ubiquitin to a model substrate of 26 S proteasomes. Although the noncanonical chain effectively signaled substrate degradation, the results of new genetic epistasis studies agree with previous genetic data in suggesting that the proteolytic activity of proteasomes is not required for error-free post-replicative repair.

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Metadata

Authors
Hofmann, R. M., & Pickart, C. M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-07
Volume
276
Issue
30
Pages
27936-27943
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2078709018
Cited by
253
References
4
FWCI
2.82
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: In Vitro Assembly and Recognition of Lys-63 Polyubiquitin Chains. https://app.cochat.ai/papers/10.1074/jbc.m103378200
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Hofmann, R. M., & Pickart, C. M. (2001). In Vitro Assembly and Recognition of Lys-63 Polyubiquitin Chains. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m103378200

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