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A Global Characterization of the Interaction Between the AhR and KLF-6

AhR 和 KLF-6 之间相互作用的全局表征

基本信息

批准号：
8960290
负责人：
Daniel Jackson
金额：
$ 1.36万
依托单位：
UNIVERSITY OF TEXAS MED BR GALVESTON
依托单位国家：
美国
项目类别：
财政年份：
2014
资助国家：
美国
起止时间：
2014-09-01 至 2015-12-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8960290
关键词：
AHR gene Abbreviations Amino Acids Apoptosis Aromatic Polycyclic Hydrocarbons Aryl Hydrocarbon Receptor Automobile Driving BHLH Protein Binding Binding Sites Biology Cell Cycle Cell Cycle Arrest Cell Nucleus Cell physiology ChIP-seq Co-Immunoprecipitations Coin Complex Consensus Coupled Cytochrome P450 DNA DNA Binding Data Dermal Development Diabetes Mellitus Diagnostic Dimethyl Sulfoxide Dioxins Disease Electrophoretic Mobility Shift Assay Elements Environmental Pollution Exposure to Family Functional disorder Future Gene Expression Gene Expression Profile Gene Expression Regulation Gene Targeting Genes Genetic Goals Health Hepatocyte Hepatotoxicity Herbicides Heterodimerization Human Immune Immunosuppression In Vitro Industrial Waste Insulin Knockout Mice Knowledge Learning Ligands Light Liver Liver diseases Malignant Neoplasms Meat Mediating Mediator of activation protein Methods Molecular Molecular Chaperones Mus Mutagenesis Mutation Nuclear Translocation Nucleotides Oils Oryctolagus cuniculus Pathway interactions Physiological Processes Plasminogen Activator Inhibitor 1 Plasminogen Inactivators Prevention Process Protein Binding Proteins RNA Sequences Receptor Activation Recombinants Research Response Elements Reticulocytes Role Sequence Analysis Shotgun Sequencing Signal Transduction Site Smoke System Testing Tetrachlorodibenzodioxin Time Toxic effect Transcriptional Regulation Tumor Suppressor Proteins Weather Work Xenobiotics activating transcription factor aryl hydrocarbon receptor ligand carcinogenesis chromatin immunoprecipitation combustion product detector genome-wide ground water human ARNT protein in vivo inhibitor/antagonist innovation insight next generation sequencing novel pollutant prognostic protein complex protein protein interaction public health relevance receptor receptor binding research study response tool transcription factor transcriptome sequencing

项目摘要

DESCRIPTION (provided by applicant): The Aryl Hydrocarbon Receptor (AhR) is a basic helix-loop-helix transcription factor activated by diverse polycyclic aromatic hydrocarbons, including the prototypical ligand and persistent environmental contaminant 2,3,7,8-tetrachlorodibenzo-p-dioxin (dioxin,TCDD). Canonically, the ligand activated AhR translocates to the nucleus, dissociates from chaperones, and heterodimerizes with the Aryl Hydrocarbon Receptor Nuclear Translocator (Arnt) to transcriptionally regulate target genes via the cis DNA motif GCGTG, termed the xenobiotic response element (XRE). Recent work has shown a number of dioxin responsive AhR target genes lack an XRE. We have recently discovered the AhR to form a novel protein complex through an interaction with Kruppel-like Factor 6 (KLF6), which binds DNA via a novel non-consensus XRE (NC-XRE). We have subsequently shown that the KLF6/AhR complex regulates expression of a novel set of AhR genes, in response to dioxin, via binding to the NC-XRE. In this light, I hypothesize the KLF6/AhR heterodimer represents a novel regulatory complex conferring transcriptional control on novel target genes via binding to the NC-XRE. To investigate this novel protein interaction I will use in vivo chromatin immunoprecipitation next generation sequencing (ChIP-seq) experiments to identify the gene targets of this complex in the mouse liver coupled with whole transcriptome shotgun sequencing to anchor DNA binding of the KLF6/AhR transcription factor complex to changes in gene expression. This method will allow us to delineate functional vs. non-functional NC-XREs in KLF6/AhR target genes. I will examine the KLF6/AhR protein-protein interaction and identify the protein elements necessary for the interaction and characterize the key NC-XRE DNA motif elements necessary for KLF6/AhR binding. It is widely accepted that the AhR is required for the development of toxicity following exposure to dioxin. However, little is known about the mechanisms of the AhR driving the development of this toxicity. As our data suggest the NC-XRE represents a novel signaling cascade for the AhR following dioxin exposure, this work will provide novel insight on the mechanisms of dioxin toxicity with respect to the AhR, while shedding light on novel prognostic and diagnostics tools for identifying and treating the deleterious health effects associated with TCDD exposure.

描述（由申请人提供）：芳烃受体（AhR）是一种基本的螺旋-环-螺旋转录因子，由多种多环芳烃激活，包括典型配体和持久性环境污染物2,3,7,8-四氯二苯并-对二恶英（dioxin，TCDD）。通常，配体激活的AhR易位到细胞核，与伴侣分离，并与芳烃受体核易位子（Aryl Hydrocarbon Receptor Nuclear Translocator, Arnt）异二聚体，通过顺式DNA基序GCGTG(称为异种反应元件（xenobiotic response element， XRE）转录调节靶基因。最近的研究表明，一些对二恶英有反应的AhR靶基因缺乏XRE。我们最近发现AhR通过与kruppel样因子6 （KLF6）的相互作用形成一种新的蛋白质复合物，KLF6通过一种新的非共识XRE （fc -XRE）结合DNA。我们随后发现，KLF6/AhR复合物通过与NC-XRE结合，调节一组新的AhR基因的表达，以响应二恶英。有鉴于此，我假设KLF6/AhR异源二聚体代表了一种新的调控复合体，通过与NC-XRE的结合对新的靶基因进行转录控制。为了研究这种新的蛋白质相互作用，我将使用体内染色质免疫沉淀下一代测序（ChIP-seq）实验来鉴定小鼠肝脏中该复合物的基因靶点，并结合全转录组霰弹枪测序来锚定KLF6/AhR转录因子复合物的DNA结合以改变基因表达。该方法将使我们能够描述KLF6/AhR靶基因中功能性和非功能性NC-XREs。我将研究KLF6/AhR蛋白-蛋白相互作用，确定相互作用所需的蛋白质元件，并表征KLF6/AhR结合所需的关键NC-XRE DNA基序元件。人们普遍认为，接触二恶英后产生毒性需要AhR。然而，对AhR驱动这种毒性发展的机制知之甚少。我们的数据表明，NC-XRE代表了二恶英暴露后AhR的一种新的信号级联，这项工作将为二恶英毒性与AhR的机制提供新的见解，同时为识别和治疗与TCDD暴露相关的有害健康影响提供新的预后和诊断工具。