Transcriptional coregulator (PubMed:18828672). Involved in control of the cell cycle and in modulating mitotic histone phosphorylation (PubMed:18043729). Plays a role in modulating lifespan by regulating the transcriptional activity of daf-16/Forkhead box protein O, in concert with protein deacetylase sir-2.1/SIRT1, and perhaps acting independently of the Insulin/IGF-1-like signaling (IIS) mediated pathway (PubMed:18828672, PubMed:21909281). Negatively modulates responses to environmental stresses, including oxidative stress, heat stress, and exposure to heavy metals; acting via regulation of the transcription factors daf-16 and skn-1 (PubMed:18828672, PubMed:21909281, PubMed:22568582). May play a role in pharyngeal development via positive modulation of expression of sup-35 (PubMed:19521497). Interacts with daf-16/FOXO (PubMed:18828672). Interacts with deacetylase sir-2.1 (PubMed:21909281). Interacts with the 14-3-3 family proteins ftt-2 and par-5 (PubMed:21909281). Localizes to nucleus, except for nucleolus. Expressed in embryos and the L1 larval stage (at protein level) (PubMed:11341844, PubMed:18828672). Expressed in embryos and adults, with lower levels in L1-L4 larvae (PubMed:9858614, PubMed:14629117). Phosphorylated at multiple serine residues (PubMed:11341844). Phosphorylation is developmentally regulated, occurring in embryos but not L1 larvae (PubMed:11341844). Phosphorylation may be cell-cycle-regulated (PubMed:11341844). RNAi-mediated knockdown causes 20-30% increase in lifespan (PubMed:18828672). Causes smaller brood size (50% of wild type) and lower hatching rate (21% vs. 99%) at 12 degrees Celsius (PubMed:18043729). Increases intestinal expression of skn-1 target genes, including gcs-1, gst-4 and gst-7; increase abolished in an skn-1 mutant background (PubMed:22568582). Substantially reduces enrichment of hcf-1 on the efl-1 promoter and enhances enrichment of daf-16 at sod-3 and mtl-1 promoters (PubMed:18828672). Two-fold reduction in the level of embryonic expression of sup-35 in a lin-35 mutant background (PubMed:19521497). Partial suppression of larval lethality in both lin-35;ubc-18 and lin-35;pha-1 mutant backgrounds and suppression of pharynx-unattached phenotypes in a pha-1 mutant background (PubMed:19521497).