A type of nuclear proteins that participate in the potentiation of transcription of genes that are responsive to ligand-dependent transcription factors. They belong to several families, including the p160 coactivators and the CBP/p300 molecules.
[co- + activator]
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Thus, inactivating mutations in SRA1, a known coactivator of ER-alfa (as once again shown in the control experiments in this study), should result in increased but not decreased gonadotropin levels.
(25, 26) Most cases of MEC are characterized by a unique and recurrent chromosome translocation t(11;19)(q21-22;p13), resulting in fusions involving mastermind-like 2 gene (MAML2) and cAMP response element-binding protein regulated transcription coactivator 1 gene (CRTC1), or more rarely, cAMP response element-binding protein regulated transcription coactivator 3 gene.
Prior to crystallization assays, the purified ER[alpha]-Y537S LBD (final concentration = 0.15 mM) was mixed with 0.3 mM chlordecone, BBP, ferutinine, [alpha]-ZA, butylparaben, 4-OP, TCBPA, BP-2, or HPTE, along with 0.3 mM SRC-1 coactivator peptide.
PGC-1[alpha] was first identified as a coactivator of transcriptional factor PPAR[gamma] and it is highly expressed in BAT upon exposure of mice to cold [14].
By sensing intracellular [NAD.sup.+]/NADH ratio, SIRT1 regulates target gene expression via changing acetylation status of histones of transcriptional factors, such as peroxisome proliferator-activated receptor gamma coactivator 1alpha (PGC-1[alpha]), tumor suppressor p53 (p53), nuclear factor kappa-light-chain-enhancer of activated B cells (NF-[kappa]B), and forkhead box O3 (FOXO3) [6], resulting in modulation of wide range of cellular fundamental processes, including DNA repairing, energy metabolism, and cell apoptosis [7, 8].
Oct-1 and Oct-2 have been shown to interact with the coactivator BOB.1/OBF.1 (official symbol: Pou2af1) and to promote OCT-dependent transcription [47-49].
The list of SIRT1 substrates is continuously increasing and includes numerous transcription factors for example: p53, members of the FOXO family, hairy and enhancer of split 1 (HES 1), hairy/enhancer-of-split related with YRPW motif 2 (HEY2) , peroxisome proliferator - activated receptor gamma (PPAR g), chicken ovalbumin upstream promoter transcription factor (COUPTF)- interacting protein 2 (CTIP 2), p300, PGC-1 a (PPAR g coactivator), and nuclear factor kB (NFkB) (Michan and Sinclair, 2007; Pillarisetti, 2008; Haigis and Guarente, 2006; Yamamoto et al., 2007).
Given the ability of peroxisome proliferator-activated receptor [gamma] coactivator 1[alpha] (PGC-1[alpha]) to activate components of the fasting response in the liver, we investigated the role of this transcriptional factor by infecting mouse primary hepatocytes for 24 h at a multiplicity of infection of 25 with adenovirus producing either PGC-1[alpha] or green fluorescent protein as a control (2).
Restoration of insulin-sensitive glucose transporter (GLUT4) gene expression in muscle cells by the transcriptional coactivator PGC1.
Further experiments by researchers revealed that rosiglitazone's side effects on bone involve a transcriptional coactivator known as PGC1b, which coordinates with another molecular actor known as ERRa.