4B9X

Structure of extended Tudor domain TD3 from mouse TDRD1

Summary for 4B9X

• Entry DOI: 10.2210/pdb4b9x/pdb
• Related: 4B9W
• Descriptor: TUDOR DOMAIN-CONTAINING PROTEIN 1 (1 entity in total)
• Functional Keywords: replication
• Biological source: MUS MUSCULUS (HOUSE MOUSE)
• Total number of polymer chains: 1
• Total formula weight: 25383.93

Authors

Mathioudakis, N.,Palencia, A.,Kadlec, J.,Round, A.,Tripsianes, K.,Sattler, M.,Pillai, R.S.,Cusack, S. (deposition date: 2012-09-08, release date: 2012-10-17, Last modification date: 2023-12-20)

Primary citation

Mathioudakis, N.,Palencia, A.,Kadlec, J.,Round, A.,Tripsianes, K.,Sattler, M.,Pillai, R.S.,Cusack, S.
The Multiple Tudor Domain-Containing Protein Tdrd1 is a Molecular Scaffold for Mouse Piwi Proteins and Pirna Biogenesis Factors.
RNA, 18:2056-, 2012

PubMed Abstract: Piwi-interacting RNAs (piRNAs) are small noncoding RNAs expressed in the germline of animals. They associate with Argonaute proteins of the Piwi subfamily, forming ribonucleoprotein complexes that are involved in maintaining genome integrity. The N-terminal region of some Piwi proteins contains symmetrically dimethylated arginines. This modification is thought to enable recruitment of Tudor domain-containing proteins (TDRDs), which might serve as platforms mediating interactions between various proteins in the piRNA pathway. We measured the binding affinity of the four individual extended Tudor domains (TDs) of murine TDRD1 protein for three different methylarginine-containing peptides from murine Piwi protein MILI. The results show a preference of TD2 and TD3 for consecutive MILI peptides, whereas TD4 and TD1 have, respectively, lower and very weak affinity for any peptide. The affinity of TD1 for methylarginine peptides can be restored by a single-point mutation back to the consensus aromatic cage sequence. These observations were confirmed by pull-down experiments with endogenous Piwi and Piwi-associated proteins. The crystal structure of TD3 bound to a methylated MILI peptide shows an unexpected orientation of the bound peptide, with additional contacts of nonmethylated residues being made outside of the aromatic cage, consistent with solution NMR titration experiments. Finally, the molecular envelope of the four tandem Tudor domains of TDRD1, derived from small angle scattering data, reveals a flexible, elongated shape for the protein. Overall, the results show that TDRD1 can accommodate different peptides from different proteins, and can therefore act as a scaffold protein for complex assembly in the piRNA pathway.

PubMed: 22996915
DOI: 10.1261/RNA.034181.112

Experimental method

X-RAY DIFFRACTION (2.8 Å)