Molecular Target Synopsis
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Piwil2 (Q8CDG1) - Overview - Molecular Target Synopsis

Protein


Piwil2, Piwi-like protein 2
Enzyme Classification 3.1.26.-
UniProt Q8CDG1

Also Known as PIWL2_MOUSE, Piwil2, Mili

Endoribonuclease that plays a central role during spermatogenesis by repressing transposable elements and preventing their mobilization, which is essential for the germline integrity (PubMed:11578866, PubMed:14736746, PubMed:17446352, PubMed:18381894, PubMed:18922463, PubMed:26669262). Plays an essential role in meiotic differentiation of spermatocytes, germ cell differentiation and in self-renewal of spermatogonial stem cells (PubMed:11578866, PubMed:14736746, PubMed:17446352, PubMed:18381894, PubMed:18922463, PubMed:26669262). Its presence in oocytes suggests that it may participate in similar functions during oogenesis in females (PubMed:11578866, PubMed:14736746, PubMed:17446352, PubMed:18381894, PubMed:18922463, PubMed:26669262). Acts via the piRNA metabolic process, which mediates the repression of transposable elements during meiosis by forming complexes composed of piRNAs and Piwi proteins and govern the methylation and subsequent repression of transposons (PubMed:11578866, PubMed:14736746, PubMed:17446352, PubMed:18381894, PubMed:18922463, PubMed:26669262). During piRNA biosynthesis, plays a key role in the piRNA amplification loop, also named ping-pong amplification cycle, by acting as a 'slicer-competent' piRNA endoribonuclease that cleaves primary piRNAs, which are then loaded onto 'slicer-incompetent' PIWIL4 (PubMed:22020280, PubMed:23706823, PubMed:26669262). PIWIL2 slicing produces a pre-miRNA intermediate, which is then processed in mature piRNAs, and as well as a 16 nucleotide by-product that is degraded (PubMed:28633017). Required for PIWIL4/MIWI2 nuclear localization and association with secondary piRNAs antisense (PubMed:18381894, PubMed:18922463, PubMed:26669262). Besides their function in transposable elements repression, piRNAs are probably involved in other processes during meiosis such as translation regulation (PubMed:19114715). Indirectly modulates expression of genes such as PDGFRB, SLC2A1, ITGA6, GJA7, THY1, CD9 and STRA8 (PubMed:16261612). Interacts with DDX4, MAEL, EIF3A, EIF4E, EIF4G, PRMT5 and WDR77. Associates with EIF4E- and EIF4G-containing m7G cap-binding complexes. Interacts (when methylated on arginine residues) with TDRD1 and TDRKH/TDRD2. Interacts with TDRD12 (PubMed:24067652). Component of the PET complex, at least composed of EXD1, PIWIL2, TDRD12 and piRNAs (PubMed:26669262). Interacts with MOV10L1 (PubMed:20534472, PubMed:20547853). Interacts with GPAT2 (PubMed:23611983). Interacts with Tex19.1 and, probably, Tex19.2 (PubMed:28254886).

4B9W
7 RESIDUE FRAGMENT OF
PIWI-LIKE PROTEIN 238-50
IN THE STRUCTURE OF
STRUCTURE OF EXTENDED TUDOR DOMAIN TD3 FROM MOUSE TDRD1 IN COMPLEX WITH MILI PEPTIDE CONTAINING DIMETHYLARGININE 45.
RCSB/PDB
Inspect Structure
See all 3D Structures for Piwil2

Isoforms / Transcripts (Protein Coding)


Protein Length Ensembl Gene Ensembl Transcript Ensembl Protein Uniprot Isoform
971Q8CDG1-1

Sub-cellular localization


UniProt: Piwil2 is active in the following subcellular-locations: cytoplasm.
GO terms: Piwil2 is active in the following subcellular-locations: chromatoid body, cytoplasm, cytosol, dense body, nucleus, P granule, perinucleolar chromocenter, PET complex, pi-body.



UniProt
GO terms

Gene Copy Number Variation


In COSMIC - Cell Lines Project Piwil2 has gain in 0 cell-lines, loss in 0 cell-lines and no signal in 0 cell-lines. (see details)

RNA Interference


Piwil2 was reported in the following RNAI studies:

Cell - Large Scale Profiling of Kinase Dependencies in Cancer Cell Lines, the highest RNAi cell lines are: . (see details)

3D Structures


For Piwil2 there are:
1 structures (2 chains) solved
1 are solved in complex with at least one small molecule ligand



(see details)
Molecular Target 3D Synopsis