Structural Changes Induced by Binding of the High-Mobility Group I Protein to a Mouse Satellite DNA Sequence
Identifieur interne : 000253 ( France/Analysis ); précédent : 000252; suivant : 000254Structural Changes Induced by Binding of the High-Mobility Group I Protein to a Mouse Satellite DNA Sequence
Auteurs : A. Slama-Schwok [France] ; K. Zakrzewska [France] ; G. Léger ; Y. Leroux ; M. Takahashi [France] ; E. K S [France] ; P. Debey [France]Source :
- Biophysical Journal [ 0006-3495 ] ; 2000.
English descriptors
- Teeft :
- Aaat, Aaat binding site, Aaat site, Absorbance, Acceptor, Acceptor emission, Anionic oxygens, Average rise, Base pairs, Bases pairs, Binding, Binding domain, Binding modes, Binding site, Binding sites, Binding stoichiometry, Biochemistry, Biol, Biologie paris, Biophysical, Biophysical journal, Cacodylate buffer, Chromatin, Chromatin structure, Chromosomal proteins, Circular dichroism, Common origin, Complementary strand, Complex figure, Complex formation, Conformation, Conformational, Conformational changes, Denaturation, Difference spectra, Difference spectrum, Direct excitation, Distinct complexes, Donor side, Donoracceptor pair, Double helix, Duplex, Early mouse embryos, Ellipticity values, Emission intensity, Energy transfer, Energy transfer efficiency, Excimer, Excimer formation, Excitation, Experimental procedures, Experiments show, First equivalent, Fluorescein, Fluorescence, Fluorescence changes, Fluorescence data, Fluorescence energy transfer, Fluorescence intensity, Fluorescence properties, Fluorescence resonance energy transfer, Fluorescence yields, Free duplex, Free protein, Globin gene, Groove, Helicoidal parameters, Helix, High mobility group protein, Hooks, Huth, Hydrogen bonds, Important question, Inflection points, Intrinsic curvature, Jovin, Junction minimization, Maniatis, Minor groove, Mobility group protein, Modeling, Mole fraction, Molecular modeling, Mouse satellite, Multiprotein complexes, Nacl, Nissen, Nucleic, Nucleic acids, Oligonucleotides, Open diamonds, Parallel orientation, Peptide, Pipes buffer, Promoter, Protein, Protein concentration, Protein conformation, Protein molecules, Protein structure, Pyrene, Pyrene excimer, Pyrene fluorescence, Pyrene fluorescence intensity, Quinine sulfate, Results show, Rhodamine, Right scale, Satellite dnas, Several aspects, Single site, Small changes, Small increase, Specific sites, Stoichiometry, Structural changes, Structural properties flexibility, Supramolecular organization, Thanos, Thermal denaturation, Thermal denaturation experiments, Transcription, Transfer efficiency, Upper part.
Abstract
Abstract: Using spectroscopic methods, we have studied the structural changes induced in both protein and DNA upon binding of the High-Mobility Group I (HMG-I) protein to a 21-bp sequence derived from mouse satellite DNA. We show that these structural changes depend on the stoichiometry of the protein/DNA complexes formed, as determined by Job plots derived from experiments using pyrene-labeled duplexes. Circular dichroism and melting temperature experiments extended in the far ultraviolet range show that while native HMG-I is mainly random coiled in solution, it adopts a β-turn conformation upon forming a 1:1 complex in which the protein first binds to one of two dA·dT stretches present in the duplex. HMG-I structure in the 1:1 complex is dependent on the sequence of its DNA target. A 3:1 HMG-I/DNA complex can also form and is characterized by a small increase in the DNA natural bend and/or compaction coupled to a change in the protein conformation, as determined from fluorescence resonance energy transfer (FRET) experiments. In addition, a peptide corresponding to an extended DNA-binding domain of HMG-I induces an ordered condensation of DNA duplexes. Based on the constraints derived from pyrene excimer measurements, we present a model of these nucleated structures. Our results illustrate an extreme case of protein structure induced by DNA conformation that may bear on the evolutionary conservation of the DNA-binding motifs of HMG-I. We discuss the functional relevance of the structural flexibility of HMG-I associated with the nature of its DNA targets and the implications of the binding stoichiometry for several aspects of chromatin structure and gene regulation.
Url:
DOI: 10.1016/S0006-3495(00)76799-3
Affiliations:
- France
- Midi-Pyrénées, Occitanie (région administrative), Île-de-France
- Orsay, Paris, Toulouse
- Université Paris-Sud
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<term>Aaat site</term>
<term>Absorbance</term>
<term>Acceptor</term>
<term>Acceptor emission</term>
<term>Anionic oxygens</term>
<term>Average rise</term>
<term>Base pairs</term>
<term>Bases pairs</term>
<term>Binding</term>
<term>Binding domain</term>
<term>Binding modes</term>
<term>Binding site</term>
<term>Binding sites</term>
<term>Binding stoichiometry</term>
<term>Biochemistry</term>
<term>Biol</term>
<term>Biologie paris</term>
<term>Biophysical</term>
<term>Biophysical journal</term>
<term>Cacodylate buffer</term>
<term>Chromatin</term>
<term>Chromatin structure</term>
<term>Chromosomal proteins</term>
<term>Circular dichroism</term>
<term>Common origin</term>
<term>Complementary strand</term>
<term>Complex figure</term>
<term>Complex formation</term>
<term>Conformation</term>
<term>Conformational</term>
<term>Conformational changes</term>
<term>Denaturation</term>
<term>Difference spectra</term>
<term>Difference spectrum</term>
<term>Direct excitation</term>
<term>Distinct complexes</term>
<term>Donor side</term>
<term>Donoracceptor pair</term>
<term>Double helix</term>
<term>Duplex</term>
<term>Early mouse embryos</term>
<term>Ellipticity values</term>
<term>Emission intensity</term>
<term>Energy transfer</term>
<term>Energy transfer efficiency</term>
<term>Excimer</term>
<term>Excimer formation</term>
<term>Excitation</term>
<term>Experimental procedures</term>
<term>Experiments show</term>
<term>First equivalent</term>
<term>Fluorescein</term>
<term>Fluorescence</term>
<term>Fluorescence changes</term>
<term>Fluorescence data</term>
<term>Fluorescence energy transfer</term>
<term>Fluorescence intensity</term>
<term>Fluorescence properties</term>
<term>Fluorescence resonance energy transfer</term>
<term>Fluorescence yields</term>
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<term>Free protein</term>
<term>Globin gene</term>
<term>Groove</term>
<term>Helicoidal parameters</term>
<term>Helix</term>
<term>High mobility group protein</term>
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<term>Huth</term>
<term>Hydrogen bonds</term>
<term>Important question</term>
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<term>Junction minimization</term>
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<term>Mobility group protein</term>
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<term>Nissen</term>
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<term>Nucleic acids</term>
<term>Oligonucleotides</term>
<term>Open diamonds</term>
<term>Parallel orientation</term>
<term>Peptide</term>
<term>Pipes buffer</term>
<term>Promoter</term>
<term>Protein</term>
<term>Protein concentration</term>
<term>Protein conformation</term>
<term>Protein molecules</term>
<term>Protein structure</term>
<term>Pyrene</term>
<term>Pyrene excimer</term>
<term>Pyrene fluorescence</term>
<term>Pyrene fluorescence intensity</term>
<term>Quinine sulfate</term>
<term>Results show</term>
<term>Rhodamine</term>
<term>Right scale</term>
<term>Satellite dnas</term>
<term>Several aspects</term>
<term>Single site</term>
<term>Small changes</term>
<term>Small increase</term>
<term>Specific sites</term>
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<term>Structural changes</term>
<term>Structural properties flexibility</term>
<term>Supramolecular organization</term>
<term>Thanos</term>
<term>Thermal denaturation</term>
<term>Thermal denaturation experiments</term>
<term>Transcription</term>
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<front><div type="abstract" xml:lang="en">Abstract: Using spectroscopic methods, we have studied the structural changes induced in both protein and DNA upon binding of the High-Mobility Group I (HMG-I) protein to a 21-bp sequence derived from mouse satellite DNA. We show that these structural changes depend on the stoichiometry of the protein/DNA complexes formed, as determined by Job plots derived from experiments using pyrene-labeled duplexes. Circular dichroism and melting temperature experiments extended in the far ultraviolet range show that while native HMG-I is mainly random coiled in solution, it adopts a β-turn conformation upon forming a 1:1 complex in which the protein first binds to one of two dA·dT stretches present in the duplex. HMG-I structure in the 1:1 complex is dependent on the sequence of its DNA target. A 3:1 HMG-I/DNA complex can also form and is characterized by a small increase in the DNA natural bend and/or compaction coupled to a change in the protein conformation, as determined from fluorescence resonance energy transfer (FRET) experiments. In addition, a peptide corresponding to an extended DNA-binding domain of HMG-I induces an ordered condensation of DNA duplexes. Based on the constraints derived from pyrene excimer measurements, we present a model of these nucleated structures. Our results illustrate an extreme case of protein structure induced by DNA conformation that may bear on the evolutionary conservation of the DNA-binding motifs of HMG-I. We discuss the functional relevance of the structural flexibility of HMG-I associated with the nature of its DNA targets and the implications of the binding stoichiometry for several aspects of chromatin structure and gene regulation.</div>
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