2N62 image
Entry Detail
PDB ID:
2N62
Keywords:
Title:
ddFLN5+110
Biological Source:
PDB Version:
Deposition Date:
2015-08-10
Release Date:
2016-03-02
Method Details:
Experimental Method:
Conformers Calculated:
1500
Conformers Submitted:
3
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:gelation factor, secretion monitor chimera
Chain IDs:A (auth: L)
Chain Length:221
Number of Molecules:1
Biological Source:Dictyostelium discoideum, Escherichia coli
Ligand Molecules
Primary Citation
A structural ensemble of a ribosome-nascent chain complex during cotranslational protein folding.
Nat.Struct.Mol.Biol. 23 278 285 (2016)
PMID: 26926436 DOI: 10.1038/nsmb.3182

Abstact

Although detailed pictures of ribosome structures are emerging, little is known about the structural and cotranslational folding properties of nascent polypeptide chains at the atomic level. Here we used solution-state NMR spectroscopy to define a structural ensemble of a ribosome-nascent chain complex (RNC) formed during protein biosynthesis in Escherichia coli, in which a pair of immunoglobulin-like domains adopts a folded N-terminal domain (FLN5) and a disordered but compact C-terminal domain (FLN6). To study how FLN5 acquires its native structure cotranslationally, we progressively shortened the RNC constructs. We found that the ribosome modulates the folding process, because the complete sequence of FLN5 emerged well beyond the tunnel before acquiring native structure, whereas FLN5 in isolation folded spontaneously, even when truncated. This finding suggests that regulating structure acquisition during biosynthesis can reduce the probability of misfolding, particularly of homologous domains.

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