Download MendeleyMolecular basis for the recognition of CIZ1 by ERH.
Wang, X., Xie, H., Zhu, Z., Zhang, J., Xu, C.(2023) FEBS J 290: 712-723
- PubMed: 36047590
- DOI: https://doi.org/10.1111/febs.16611
- Primary Citation of Related Structures:
7X39 - PubMed Abstract:
Enhancer of rudimentary homologue (ERH), a small protein conserved in eukaryotes, is involved in a wide spectrum of cellular events, including cell cycle progression, piRNA biogenesis, miRNA maturation and gene expression. Human ERH is recruited to replication foci by CDKN1A-interacting zinc finger protein 1 (CIZ1), and plays an important role in cell growth control. However, the molecular basis for CIZ1 recognition by ERH remains unknown. By using GST pull-down experiment, we found that a fragment within CIZ1, upstream of its first zinc finger, is sufficient for binding to ERH. We solved the structure of CIZ1-bound ERH, in which the ERH dimer binds to two CIZ1 fragments to form a 2 : 2 heterotetramer. CIZ1 forms intermolecular antiparallel β-strands with ERH, and its binding surface on ERH is distinct from those of other known ERH-binding ligands. The ERH-CIZ1 interface was further validated by mutagenesis and binding experiments. Our structural study complemented by biochemistry experiments not only provides insights into a previously unidentified ligand-binding mode for ERH but also sheds light on the understanding of evolutionarily conserved roles for ERH orthologs.
Organizational Affiliation:
MOE Key Laboratory for Cellular Dynamics, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
