4OZC image
Deposition Date 2014-02-14
Release Date 2014-07-16
Last Version Date 2023-11-15
Entry Detail
PDB ID:
4OZC
Keywords:
Title:
Backbone Modifications in the Protein GB1 Helix and Loops: beta-ACPC21, beta-ACPC24, beta-3-Lys28, beta-3-Lys31, beta-ACPC35, beta-ACPC40
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
I 41
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Streptococcal Protein GB1 Backbone Modified Variant: beta-ACPC21, beta-ACPC24, beta-3-Lys28, beta-3-Lys31, beta-ACPC35, beta-ACPC40
Chain IDs:A
Chain Length:57
Number of Molecules:1
Biological Source:Streptococcus sp.
Primary Citation
Folding Thermodynamics of Protein-Like Oligomers with Heterogeneous Backbones.
Chem Sci 5 3325 3330 (2014)
PMID: 25071931 DOI: 10.1039/C4SC01094A

Abstact

The thermodynamics of protein folding are dictated by a complex interplay of interatomic interactions and physical forces. A variety of unnatural protein-like oligomers have the capacity to manifest defined folding patterns. While the energetics of folding in natural proteins is well studied, little is known about the forces that govern folding in modified backbones. Here, we explore the thermodynamic consequences of backbone alteration on protein folding, focusing on two types of chemical changes made in different structural contexts of a compact tertiary fold. Our results reveal a surprising favorable impact on folding entropy that accompanies modifications that increase disorder in the ensemble of unfolded states, due to differences in the solvation of natural and unnatural backbones.

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