Component of the rik1-associated E3 ubiquitin ligase complex that shows ubiquitin ligase activity and is required for histone H3K9 methylation. H3K9me represents a specific tag for epigenetic transcriptional repression by recruiting swi6/HP1 to methylated histones which leads to transcriptional silencing within centromeric heterochromatin; telomeric regions and at the silent mating-type loci. Rik1 has also a function in meiotic telomere clustering. {ECO:0000269|PubMed:10766735; ECO:0000269|PubMed:15197176; ECO:0000269|PubMed:15372076; ECO:0000269|PubMed:16024659; ECO:0000269|PubMed:7851795; ECO:0000269|PubMed:8138176}.