The domesticated transposase ALP2 mediates formation of a novel Polycomb protein complex by direct interaction with MSI1, a core subunit of Polycomb Repressive Complex 2 (PRC2)

Autoři: Christos N. Velanis aff001;  Pumi Perera aff001;  Bennett Thomson aff002;  Erica de Leau aff001;  Shih Chieh Liang aff001;  Ben Hartwig aff003;  Alex Förderer aff003;  Harry Thornton aff001;  Pedro Arede aff001;  Jiawen Chen aff001;  Kimberly M. Webb aff004;  Serin Gümüs aff005;  Geert De Jaeger aff006;  Clinton A. Page aff008;  C. Nathan Hancock aff008;  Christos Spanos aff004;  Juri Rappsilber aff004;  Philipp Voigt aff004;  Franziska Turck aff003;  Frank Wellmer aff002;  Justin Goodrich aff001;  Alexander Förderer aff003
Působiště autorů: Institute of Molecular Plant Science, School of Biological Sciences, University of Edinburgh, Daniel Rutherford Building, Max Born Crescent, Edinburgh, United Kingdom aff001;  Smurfit Institute of Genetics, Trinity College Dublin, Ireland aff002;  Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Köln, Germany aff003;  Wellcome Centre for Cell Biology, School of Biological Sciences, University of Edinburgh, Max Born Crescent, Edinburgh, United Kingdom aff004;  Department of Biotechnology, Mannheim University of Applied Science, Mannheim, Germany aff005;  Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium aff006;  VIB Center for Plant Systems Biology, Gent, Belgium aff007;  Department of Biology & Geology, University of South Carolina Aiken, Aiken, South Carolina, United States of America aff008;  Bioanalytics Unit, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany aff009;  Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany aff009
Vyšlo v časopise: The domesticated transposase ALP2 mediates formation of a novel Polycomb protein complex by direct interaction with MSI1, a core subunit of Polycomb Repressive Complex 2 (PRC2). PLoS Genet 16(5): e1008681. doi:10.1371/journal.pgen.1008681
Kategorie: Research Article


A large fraction of plant genomes is composed of transposable elements (TE), which provide a potential source of novel genes through “domestication”–the process whereby the proteins encoded by TE diverge in sequence, lose their ability to catalyse transposition and instead acquire novel functions for their hosts. In Arabidopsis, ANTAGONIST OF LIKE HETEROCHROMATIN PROTEIN 1 (ALP1) arose by domestication of the nuclease component of Harbinger class TE and acquired a new function as a component of POLYCOMB REPRESSIVE COMPLEX 2 (PRC2), a histone H3K27me3 methyltransferase involved in regulation of host genes and in some cases TE. It was not clear how ALP1 associated with PRC2, nor what the functional consequence was. Here, we identify ALP2 genetically as a suppressor of Polycomb-group (PcG) mutant phenotypes and show that it arose from the second, DNA binding component of Harbinger transposases. Molecular analysis of PcG compromised backgrounds reveals that ALP genes oppose silencing and H3K27me3 deposition at key PcG target genes. Proteomic analysis reveals that ALP1 and ALP2 are components of a variant PRC2 complex that contains the four core components but lacks plant-specific accessory components such as the H3K27me3 reader LIKE HETEROCHROMATION PROTEIN 1 (LHP1). We show that the N-terminus of ALP2 interacts directly with ALP1, whereas the C-terminus of ALP2 interacts with MULTICOPY SUPPRESSOR OF IRA1 (MSI1), a core component of PRC2. Proteomic analysis reveals that in alp2 mutant backgrounds ALP1 protein no longer associates with PRC2, consistent with a role for ALP2 in recruitment of ALP1. We suggest that the propensity of Harbinger TE to insert in gene-rich regions of the genome, together with the modular two component nature of their transposases, has predisposed them for domestication and incorporation into chromatin modifying complexes.

Klíčová slova:

Arabidopsis thaliana – DNA-binding proteins – Domestic animals – Flowering plants – Nucleases – Phenotypes – Protein interactions – Sequence alignment


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