The transcription factor LF-A1 interacts with a bipartite recognition sequence in the promoter regions of several liver-specific genes.
نویسندگان
چکیده
The transcription factors LF-A1 and LF-B1 are required for the cell-specific expression of the human alpha 1-antitrypsin gene in hepatocytes. We report here the purification and preliminary characterization of LF-A1. This protein, purified to homogeneity from calf liver nuclei by site-specific DNA affinity chromatography and reverse-phase HPLC, has a molecular mass of 40 kDa. Binding sites of LF-A1 are present in the promoter regions of several genes expressed in the liver (alpha 1-antitrypsin, apolipoproteins A1, B1, A4 and pyruvate kinase). Interestingly, the binding site of LF-A1 is bipartite and consists of two short sequence motifs (consensus: TGGACT/CT/C and TGGCCC) separated by a variable 'spacer' region. Insertion or deletion of 1-4 nucleotides in the 'spacer' region of the site in the alpha 1-antitrypsin promoter does not abolish DNA binding.
منابع مشابه
Oestrogen facilitates the binding of ubiquitous and liver-enriched nuclear proteins to the apoVLDL II promoter in vivo
Using genomic and in vitro DNasel footprinting, we have analyzed protein-DNA interactions within the promoter region of the oestrogen-inducible gene encoding chicken apoVLDL II. The footprints coincide with previously detected guanosine-protein contacts in vivo. All footprints identified are present in the apoVLDL II-expressing liver exclusively and absent in hormone-naive liver, spleen and ovi...
متن کاملIn silico screening of G-Quadruplex Structures in Wilms tumor 1 Gene Promoter
Introduction: X-ray diffraction studies have revealed that guanines in a DNA stands may be arranged in quartet and form a structure called G-quadruplexs. Bioinformatics studies suggested the formation of G-quadruplex structure in human crucial genes, including Wilms tumor 1 (WT1). The aim of this study was to in silico analysis of the guanine-rich sequence in the promoter region of the WT1 gene...
متن کاملEvaluation of MYB93 and MAD8 Genes in Transgenic and Non-Transgenic Rice
Increasing drought tolerance, especially in rice, which is one of the most important crops in Asia, is necessary. Transcription factors are specific sequence DNA-binding proteins that are capable of activating or suppressing transcription. These proteins regulate gene expression levels by binding to cis regulatory elements in the promoter of target genes to control various biological processes ...
متن کاملGene regulation network fitting of genes involved in the pathophysiology of fatty liver in the mice by promoter mining
Background and Aim: Non-Alcoholic Fatty Liver Disease (NAFLD) is the major cause of chronic liver disease in developed countries. In this study, we identified the most important transcription factors and biological mechanisms affecting the incidence of fatty liver disease using the promoter region data mining. Materials and Methods In this study, at first, the marker genes associated with this...
متن کاملRegulatory elements and DNA-binding proteins mediating transcription from the chicken very-low-density apolipoprotein II gene.
The chicken Very-Low-Density Apolipoprotein II (apoVLDL II) gene is specifically expressed in liver in response to estrogen. In this study, we performed a functional analysis of the 300-base pair region immediately 5' to the gene by gene transfer of chloramphenicol acetyl transferase (CAT) constructs into chicken embryonic hepatocytes (CEH). Two estrogen response elements (EREs) could be distin...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Nucleic acids research
دوره 19 5 شماره
صفحات -
تاریخ انتشار 1991