This family of plant proteins includes RDM1 from Arabidopsis, which is a component of the RNA-directed DNA methylation (RdDM) effector complex and may have a role in linking siRNA production with pre-existing or de novo cytosine methylation [1]. As part of the DDR complex with two other RdDM components, it has been shown to facilitate association of PolV to chromatin [2,3].

1: An RNA polymerase II- and AGO4-associated protein acts in RNA-directed DNA methylation. Gao Z, Liu HL, Daxinger L, Pontes O, He X, Qian W, Lin H, Xie M, Lorkovic ZJ, Zhang S, Miki D, Zhan X, Pontier D, Lagrange T, Jin H, Matzke AJ, Matzke M, Pikaard CS, Zhu JK; Nature. 2010;465:106-109. PMID:20410883

2: A protein complex required for polymerase V transcripts and RNA- directed DNA methylation in Arabidopsis. Law JA, Ausin I, Johnson LM, Vashisht AA, Zhu JK, Wohlschlegel JA, Jacobsen SE; Curr Biol. 2010;20:951-956. PMID:20409711

3: DDR complex facilitates global association of RNA polymerase V to promoters and evolutionarily young transposons. Zhong X, Hale CJ, Law JA, Johnson LM, Feng S, Tu A, Jacobsen SE; Nat Struct Mol Biol. 2012;19:870-875. PMID:22864289

4: Structure at 1.6 A resolution of the protein from gene locus At3g22680 from Arabidopsis thaliana. Allard ST, Bingman CA, Johnson KA, Wesenberg GE, Bitto E, Jeon WB, Phillips GN Jr; Acta Crystallograph Sect F Struct Biol Cryst Commun. 2005;61:647-650. PMID:16511118