Molecular basis for the selective recognition and ubiquitination of centromeric histone H3 by yeast E3 ligase Psh1

Ning Zhou; Liuxin Shi; Shan Shan; Zheng Zhou

doi:10.1016/j.jgg.2021.04.007

Volume 48 Issue 6

Jun. 2021

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Article Navigation > Journal of Genetics and Genomics > 2021 > 48(6): 463-472

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Molecular basis for the selective recognition and ubiquitination of centromeric histone H3 by yeast E3 ligase Psh1

doi: 10.1016/j.jgg.2021.04.007

a National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China;
b University of Chinese Academy of Sciences, Beijing 100089, China

Funds:

and all members of the Zhou Laboratory for helpful discussion. This work was supported by the grants from Natural Science Foundation of China (31521002, 31970621, 31871318, 31671344, 31801070), National Key Research and Development Program of China (2019YFA0508902), and Strategic Priority Research Program (XDB37010100).

Xiaoli Feng for assistance in experiment

We thank Dr. Mizuguchi Gaku and Carl Wu for providing yeast strains and invaluable suggestions

Chinese Academy of Science (IBP, CAS) for technical help

Yuanyuan Chen, Zhenwei Yang, Bingxue Zhou, and members in Core Facilities for Protein Science at the Institute of Biophysics

Received Date: 2021-01-22
Revised Date: 2021-04-06
Accepted Date: 2021-04-11
Publish Date: 2021-06-20

Abstract

Abstract

Centromeres are chromosomal loci marked by histone variant CenH3 (centromeric histone H3) and essential for genomic stability and cell division. The budding yeast E3 ubiquitin ligase Psh1 selectively recognizes the yeast CenH3 (Cse4) for ubiquitination and controls the cellular level of Cse4 for proteolysis, but the underlying mechanism remains largely unknown. Here, we show that Psh1 uses a Cse4-binding domain (CBD, residues 1–211) to interact with Cse4-H4 instead of H3-H4, yielding a dissociation constant (K_d) of 27 nM. Psh1 recognizes Cse4-specific residues in the L1 loop and α2 helix to ensure Cse4 binding and ubiquitination. We map the Psh1-binding region of Cse4-H4 and identify a wide range of Cse4-specific residues required for the Psh1-mediated Cse4 recognition and ubiquitination. Further analyses reveal that histone chaperone Scm3 can impair Cse4 ubiquitination by abrogating Psh1-Cse4 binding. Together, our study reveals a novel Cse4-binding mode distinct from those of known CenH3 chaperones and elucidates the mechanism by which Scm3 competes with Psh1 for Cse4 binding.
- Cse4,
- CENP-A,
- Psh1,
- Scm3,
- Selective recognition,
- Ubiquitination

These authors contributed equally to this work.

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References(24)

References

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