We are analyzing https://link.springer.com/article/10.1007/s10858-012-9696-4.

Title:
Solution structure of the two RNA recognition motifs of hnRNP A1 using segmental isotope labeling: how the relative orientation between RRMs influences the nucleic acid binding topology | Journal of Biomolecular NMR
Description:
Human hnRNP A1 is a multi-functional protein involved in many aspects of nucleic-acid processing such as alternative splicing, micro-RNA biogenesis, nucleo-cytoplasmic mRNA transport and telomere biogenesis and maintenance. The N-terminal region of hnRNP A1, also named unwinding protein 1 (UP1), is composed of two closely related RNA recognition motifs (RRM), and is followed by a C-terminal glycine rich region. Although crystal structures of UP1 revealed inter-domain interactions between RRM1 and RRM2 in both the free and bound form of UP1, these interactions have never been established in solution. Moreover, the relative orientation of hnRNP A1 RRMs is different in the free and bound crystal structures of UP1, raising the question of the biological significance of this domain movement. In the present study, we have used NMR spectroscopy in combination with segmental isotope labeling techniques to carefully analyze the inter-RRM contacts present in solution and subsequently determine the structure of UP1 in solution. Our data unambiguously demonstrate that hnRNP A1 RRMs interact in solution, and surprisingly, the relative orientation of the two RRMs observed in solution is different from the one found in the crystal structure of free UP1 and rather resembles the one observed in the nucleic-acid bound form of the protein. This strongly supports the idea that the two RRMs of hnRNP A1 have a single defined relative orientation which is the conformation previously observed in the bound form and now observed in solution using NMR. It is likely that the conformation in the crystal structure of the free form is a less stable form induced by crystal contacts. Importantly, the relative orientation of the RRMs in proteins containing multiple-RRMs strongly influences the RNA binding topologies that are practically accessible to these proteins. Indeed, RRM domains are asymmetric binding platforms contacting single-stranded nucleic acids in a single defined orientation. Therefore, the path of the nucleic acid molecule on the multiple RRM domains is strongly dependent on whether the RRMs are interacting with each other. The different nucleic acid recognition modes by multiple-RRM domains are briefly reviewed and analyzed on the basis of the current structural information.
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Keywords {🔍}

article, google, scholar, nmr, rna, protein, structure, recognition, hnrnp, biol, proteins, mol, allain, binding, solution, ads, segmental, labeling, splicing, biomol, nuclear, human, motifs, isotope, rrms, crystal, domain, domains, structural, orientation, nucleic, rrm, spectroscopy, basis, regulation, nat, krainer, mrna, bound, access, determination, sci, multidomain, fht, nature, relative, rnabinding, chem, proc, natl,

Topics {✒️}

expressed protein ligation doublet-separated sensitivity-enhanced hsqc inter-rrm contacts present multi-domain protein recognition n-terminal rna-binding domains inter domain contacts segmental isotope labeling single-stranded-rna binding pre-mrna binding proteins multi-functional protein involved intein month download article/chapter structural biology alternative pre-mrna splicing protein ligation plastic rna-binding platform nucleo-cytoplasmic mrna transport large multi-domain proteins single-stranded telomeric dna telomeric single-stranded dna au-rich rna reveals au-rich element rna ciba-geigy jubilee foundation domain–domain interactions author information authors rna binding domain noesy spectra segmental isotopic labeling segmental labeling strategy full-length human apolipoprotein signal-transducing protein article barraud interaction studies initial pet9d-hnrnpa1 plasmid single defined orientation multi-domain proteins polyadenylate binding protein protein trans-splicing multi-domain macromolecules molecular biology nucleic-acid bound form n-terminal region author correspondence pre-ribosomal rna interaction rrm domain mrna 3′utr recognition rna recognition motifs rna-recognition motifs protein structures solved

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         headline:Solution structure of the two RNA recognition motifs of hnRNP A1 using segmental isotope labeling: how the relative orientation between RRMs influences the nucleic acid binding topology
         description:Human hnRNP A1 is a multi-functional protein involved in many aspects of nucleic-acid processing such as alternative splicing, micro-RNA biogenesis, nucleo-cytoplasmic mRNA transport and telomere biogenesis and maintenance. The N-terminal region of hnRNP A1, also named unwinding protein 1 (UP1), is composed of two closely related RNA recognition motifs (RRM), and is followed by a C-terminal glycine rich region. Although crystal structures of UP1 revealed inter-domain interactions between RRM1 and RRM2 in both the free and bound form of UP1, these interactions have never been established in solution. Moreover, the relative orientation of hnRNP A1 RRMs is different in the free and bound crystal structures of UP1, raising the question of the biological significance of this domain movement. In the present study, we have used NMR spectroscopy in combination with segmental isotope labeling techniques to carefully analyze the inter-RRM contacts present in solution and subsequently determine the structure of UP1 in solution. Our data unambiguously demonstrate that hnRNP A1 RRMs interact in solution, and surprisingly, the relative orientation of the two RRMs observed in solution is different from the one found in the crystal structure of free UP1 and rather resembles the one observed in the nucleic-acid bound form of the protein. This strongly supports the idea that the two RRMs of hnRNP A1 have a single defined relative orientation which is the conformation previously observed in the bound form and now observed in solution using NMR. It is likely that the conformation in the crystal structure of the free form is a less stable form induced by crystal contacts. Importantly, the relative orientation of the RRMs in proteins containing multiple-RRMs strongly influences the RNA binding topologies that are practically accessible to these proteins. Indeed, RRM domains are asymmetric binding platforms contacting single-stranded nucleic acids in a single defined orientation. Therefore, the path of the nucleic acid molecule on the multiple RRM domains is strongly dependent on whether the RRMs are interacting with each other. The different nucleic acid recognition modes by multiple-RRM domains are briefly reviewed and analyzed on the basis of the current structural information.
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      description:Human hnRNP A1 is a multi-functional protein involved in many aspects of nucleic-acid processing such as alternative splicing, micro-RNA biogenesis, nucleo-cytoplasmic mRNA transport and telomere biogenesis and maintenance. The N-terminal region of hnRNP A1, also named unwinding protein 1 (UP1), is composed of two closely related RNA recognition motifs (RRM), and is followed by a C-terminal glycine rich region. Although crystal structures of UP1 revealed inter-domain interactions between RRM1 and RRM2 in both the free and bound form of UP1, these interactions have never been established in solution. Moreover, the relative orientation of hnRNP A1 RRMs is different in the free and bound crystal structures of UP1, raising the question of the biological significance of this domain movement. In the present study, we have used NMR spectroscopy in combination with segmental isotope labeling techniques to carefully analyze the inter-RRM contacts present in solution and subsequently determine the structure of UP1 in solution. Our data unambiguously demonstrate that hnRNP A1 RRMs interact in solution, and surprisingly, the relative orientation of the two RRMs observed in solution is different from the one found in the crystal structure of free UP1 and rather resembles the one observed in the nucleic-acid bound form of the protein. This strongly supports the idea that the two RRMs of hnRNP A1 have a single defined relative orientation which is the conformation previously observed in the bound form and now observed in solution using NMR. It is likely that the conformation in the crystal structure of the free form is a less stable form induced by crystal contacts. Importantly, the relative orientation of the RRMs in proteins containing multiple-RRMs strongly influences the RNA binding topologies that are practically accessible to these proteins. Indeed, RRM domains are asymmetric binding platforms contacting single-stranded nucleic acids in a single defined orientation. Therefore, the path of the nucleic acid molecule on the multiple RRM domains is strongly dependent on whether the RRMs are interacting with each other. The different nucleic acid recognition modes by multiple-RRM domains are briefly reviewed and analyzed on the basis of the current structural information.
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         RNA recognition modes
         Biological and Medical Physics
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