Download MendeleyStructural basis for arginine methylation-independent recognition of PIWIL1 by TDRD2.
Zhang, H., Liu, K., Izumi, N., Huang, H., Ding, D., Ni, Z., Sidhu, S.S., Chen, C., Tomari, Y., Min, J.(2017) Proc Natl Acad Sci U S A 114: 12483-12488
- PubMed: 29118143
- DOI: https://doi.org/10.1073/pnas.1711486114
- Primary Citation of Related Structures:
5J39, 6B57 - PubMed Abstract:
The P-element-induced wimpy testis (PIWI)-interacting RNA (piRNA) pathway plays a central role in transposon silencing and genome protection in the animal germline. A family of Tudor domain proteins regulates the piRNA pathway through direct Tudor domain-PIWI interactions. Tudor domains are known to fulfill this function by binding to methylated PIWI proteins in an arginine methylation-dependent manner. Here, we report a mechanism of methylation-independent Tudor domain-PIWI interaction. Unlike most other Tudor domains, the extended Tudor domain of mammalian Tudor domain-containing protein 2 (TDRD2) preferentially recognizes an unmethylated arginine-rich sequence from PIWI-like protein 1 (PIWIL1). Structural studies reveal an unexpected Tudor domain-binding mode for the PIWIL1 sequence in which the interface of Tudor and staphylococcal nuclease domains is primarily responsible for PIWIL1 peptide recognition. Mutations disrupting the TDRD2-PIWIL1 interaction compromise piRNA maturation via 3'-end trimming in vitro. Our work presented here reveals the molecular divergence of the interactions between different Tudor domain proteins and PIWI proteins.
Organizational Affiliation:
Structural Genomics Consortium, University of Toronto, Toronto, ON M5G 1L7, Canada.
