8ERY image
Entry Detail
PDB ID:
8ERY
Keywords:
Title:
Backbone modifications in the inter-helix loop of designed miniprotein oPPalpha: Asp10Asn11 turn
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-10-13
Release Date:
2023-04-05
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Designed miniprotein oPPalpha: Asp10Asn11 turn
Chain IDs:A
Chain Length:36
Number of Molecules:1
Biological Source:Streptococcus mutans
Ligand Molecules
Primary Citation
Protein Backbone Alteration in Non-hairpin beta-Turns: Impacts on Tertiary Folded Structure and Folded Stability.
Chembiochem ? e202300113 e202300113 (2023)
PMID: 36920327 DOI: 10.1002/cbic.202300113

Abstact

The importance of β-turns to protein folding has motivated extensive efforts to stabilize the motif with non-canonical backbone connectivity. Prior work has focused almost exclusively on turns between strands in a β-sheet (i. e., hairpins). Turns in other structural contexts are also common in nature and have distinct conformational preferences; however, design principles for their mimicry remain poorly understood. Here, we report strategies that stabilize non-hairpin β-turns through systematic evaluation of the impacts of backbone alteration on the high-resolution folded structure and folded stability of a helix-loop-helix prototype protein. Several well-established hairpin turn mimetics are shown detrimental to folded stability and/or hydrophobic core packing, while less-explored modification schemes that reinforce alternate turn types lead to improved stability and more faithful structural mimicry. Collectively, these results have implications in control over protein folding through chemical modification as well as the design of protein mimetics.

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Primary Citation of related structures