Abstract
The anaphase-promoting complex or cyclosome (APC/C) initiates mitotic exit by ubiquitylating cell-cycle regulators such as cyclin B1 and securin. Lys 48-linked ubiquitin chains represent the canonical signal targeting proteins for degradation by the proteasome, but they are not required for the degradation of cyclin B1. Lys 11-linked ubiquitin chains have been implicated in degradation of APC/C substrates, but the Lys 11-chain-forming E2 UBE2S is not essential for mitotic exit, raising questions about the nature of the ubiquitin signal that targets APC/C substrates for degradation. Here we demonstrate that multiple monoubiquitylation of cyclin B1, catalysed by UBCH10 or UBC4/5, is sufficient to target cyclin B1 for destruction by the proteasome. When the number of ubiquitylatable lysines in cyclin B1 is restricted, Lys 11-linked ubiquitin polymers elaborated by UBE2S become increasingly important. We therefore explain how a substrate that contains multiple ubiquitin acceptor sites confers flexibility in the requirement for particular E2 enzymes in modulating the rate of ubiquitin-dependent proteolysis.
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Acknowledgements
We thank D. Morgan (UCSF, USA) for baculoviruses encoding human cyclin B1 and CDK1. Human ubiquitin cloned in pET3a was a gift from C. M. Pickart (Johns Hopkins University, USA). Antibody for UBCH10 immunodepletion was a gift from H. Yu (UT Southwestern, USA). We thank M. Aguiar (Gygi laboratory, Harvard Medical School, USA) for carrying out mass spectrometry to confirm the presence of UBE2S and USP14 in Xenopus egg extract, and H. Besche and S. Elsasser (Harvard Medical School, USA), as well as K. Sackton and F. Sigoillot and the remaining members of the King laboratory, for helpful discussions. This work was financially supported by NIH GM66492 to R.W.K. and GM095526 to D.F.
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N.V.D. and R.W.K. designed and interpreted the experiments. N.V.D. carried out and analysed all experiments except those outlined below. N.A.H. carried out cyclin B1 ubiquitylation for ubiquitin-AQUA analysis and degradation assays with these species in APC/C-depleted extract. D.S.K. carried out the ubiquitin-AQUA analysis on cyclin B1 ubiquitylated in vitro with the E2 UBC4 and different ubiquitin types in the laboratory of S.P.G. B-H.L. provided purified human proteasomes with oversight from D.F. M.L.B. helped with cloning of different cyclin B1 mutants. The manuscript was written by N.V.D. and R.W.K. with input from all authors.
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Dimova, N., Hathaway, N., Lee, BH. et al. APC/C-mediated multiple monoubiquitylation provides an alternative degradation signal for cyclin B1. Nat Cell Biol 14, 168–176 (2012). https://doi.org/10.1038/ncb2425
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DOI: https://doi.org/10.1038/ncb2425
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