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Probing ribosome-nascent chain complexes produced in vivo by NMR spectroscopy

Cabrita, LD; Hsu, STD; Launay, H; Dobson, CM; Christodoulou, J; (2009) Probing ribosome-nascent chain complexes produced in vivo by NMR spectroscopy. P NATL ACAD SCI USA , 106 (52) 22239 - 22244. 10.1073/pnas.0903750106.

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Abstract

The means by which a polypeptide chain acquires its unique 3-D structure is a fundamental question in biology. During its synthesis on the ribosome, a nascent chain (NC) emerges vectorially and will begin to fold in a cotranslational fashion. The complex environment of the cell, coupled with the gradual emergence of the ribosome-tethered NC during its synthesis, imposes conformational restraints on its folding landscape that differ from those placed on an isolated protein when stimulated to fold following denaturation in solution. To begin to examine cotranslational folding as it would occur within a cell, we produce highly selective, isotopically labeled NCs bound to isotopically silent ribosomes in vivo. We then apply NMR spectroscopy to study, at a residue specific level, the conformation of NCs consisting of different fractional lengths of the polypeptide chain corresponding to a given protein. This combined approach provides a powerful means of generating a series of snapshots of the folding of the NC as it emerges from the ribosome. Application of this strategy to the NMR analysis of the progressive synthesis of an Ig-like domain reveals the existence of a partially folded ribosome-bound species that is likely to represent an intermediate species populated during the cotranslational folding process.

Type: Article
Title: Probing ribosome-nascent chain complexes produced in vivo by NMR spectroscopy
DOI: 10.1073/pnas.0903750106
Keywords: cotranslational folding, ribosome, SecM, EXIT TUNNEL, ESCHERICHIA-COLI, PROTEIN-STRUCTURE, TRANSLATING RIBOSOMES, ATOMIC-STRUCTURE, STRUCTURAL BASIS, DYNAMICS, CONFORMATIONS, RESOLUTION, DOMAINS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
URI: http://discovery.ucl.ac.uk/id/eprint/1318771
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