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Plant Cell. 2019 May;31(5):1141-1154. doi: 10.1105/tpc.18.00663. Epub 2019 Mar 26.

The Chromatin-Associated Protein PWO1 Interacts with Plant Nuclear Lamin-like Components to Regulate Nuclear Size.

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Institute for Biology, Freie Universität Berlin, Berlin 14195, Germany.
Institute for Biology, Heinrich-Heine-University Düsseldorf, Düsseldorf 40225, Germany.
Institute for Biology, Humboldt-University Berlin, Berlin 10115, Germany.
Laboratory of Molecular Biology, Wageningen University, Wageningen 6700 AP, The Netherlands.
Institute for Biology, Freie Universität Berlin, Berlin 14195, Germany


Spatial organization of chromatin contributes to gene regulation of many cellular processes and includes a connection of chromatin with the nuclear lamina (NL). The NL is a protein mesh that resides underneath the inner nuclear membrane and consists of lamins and lamina-associated proteins. Chromatin regions associated with lamins in animals are characterized mostly by constitutive heterochromatin, but association with facultative heterochromatin mediated by Polycomb-group (PcG) proteins has been reported as well. In contrast with animals, plant NL components are largely not conserved and NL association with chromatin is poorly explored. Here, we present the connection between the lamin-like protein, CROWDED NUCLEI1 (CRWN1), and the chromatin- and PcG-associated component, PROLINE-TRYPTOPHANE-TRYPTOPHANE-PROLINE INTERACTOR OF POLYCOMBS1, in Arabidopsis (Arabidopsis thaliana). We show that PWO1 and CRWN1 proteins associate physically with each other, act in the same pathway to maintain nuclear morphology, and control expression of a similar set of target genes. Moreover, we demonstrate that transiently expressed PWO1 proteins form foci located partially at the subnuclear periphery. Ultimately, as CRWN1 and PWO1 are plant-specific, our results argue that plants might have developed an equivalent, rather than homologous, mechanism of linking chromatin repression and NL.

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