Archives of biochemistry and biophysics, 2003-01, Vol.409 (2), p.357-366
2003
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- Autor(en) / Beteiligte
- Titel
- Interaction of wheat high-mobility-group proteins with four-way-junction DNA and characterization of the structure and expression of HMGA gene
- Ist Teil von
- Archives of biochemistry and biophysics, 2003-01, Vol.409 (2), p.357-366
- Ort / Verlag
- United States: Elsevier Inc
- Erscheinungsjahr
- 2003
- Quelle
- MEDLINE
- Beschreibungen/Notizen
- Plant high-mobility-group (HMG) chromosomal proteins are the most abundant and ubiquitous nonhistone proteins found in the nuclei of higher eukaryotes. There are only two families of HMG proteins, namely, HMGA and HMGB in plants. The cDNA encoding wheat HMGa protein was isolated and characterized. Wheat HMGA cDNA encodes a protein of 189 amino acid residues. At its N terminus, there is a histone H1-like structure, which is a common feature of plant HMGA proteins, followed by four AT-hook motifs. Polymerase chain reaction results show that the gene contains a single intron of 134 bp. All four AT-hook motifs are encoded by the second exon. Northern blot results show that the expression of HMGA gene is much higher in organs undergoing active cell proliferation. Gel retardation analysis show that wheat HMGa, b, c and histone H1 bind to four-way-junction DNA with high binding affinity, but affinity is dramatically reduced with increasing Mg 2+ and Na + ion concentration. Competition binding studies show that proteins share overlapping binding sites on four-way-junction DNA. HMGd does not bind to four-way-junction DNA.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0003-9861eISSN: 1096-0384DOI: 10.1016/S0003-9861(02)00630-6Titel-ID: cdi_proquest_miscellaneous_72934623
- Format
- –
- Schlagworte
- Amino Acid Sequence, AT-Hook Motifs, Base Sequence, Cell Division, Cell proliferation, DNA, Plant - chemistry, DNA, Plant - metabolism, DNA-Binding Proteins - drug effects, DNA-Binding Proteins - metabolism, Dose-Response Relationship, Drug, Exons, Four-way-junction DNA, Gene Expression Regulation, Plant, High Mobility Group Proteins - genetics, High Mobility Group Proteins - isolation & purification, High Mobility Group Proteins - metabolism, Histones - drug effects, Histones - metabolism, HMG proteins, HMGA Proteins - chemistry, HMGA Proteins - drug effects, HMGA Proteins - genetics, HMGA Proteins - isolation & purification, HMGA Proteins - metabolism, HMGB Proteins - drug effects, HMGB Proteins - metabolism, Introns, Magnesium - pharmacology, Molecular Sequence Data, Nuclear Proteins - genetics, Nuclear Proteins - isolation & purification, Nuclear Proteins - metabolism, Plant Proteins - genetics, Plant Proteins - isolation & purification, Plant Proteins - metabolism, Protein Binding - drug effects, Protein Structure, Tertiary, Protein–DNA interaction, Sodium - pharmacology, Spermidine - pharmacology, Triticum - genetics, Triticum - metabolism