8T0H | pdb_00008t0h

Backbone Dialkylation in Peptide Hairpins: (S)-Ethylpropylglycine variant

• PDB DOI: https://doi.org/10.2210/pdb8T0H/pdb
• BMRB: 31090

• Classification: DE NOVO PROTEIN
• Organism(s): Streptococcus sp. 'group G
• Mutation(s): No 


• Deposited: 2023-06-01 Released: 2023-08-16 
• Deposition Author(s): Heath, S.L., Horne, W.S., Lengyel, G.A.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

Effects of chirality and side chain length in C alpha , alpha-dialkylated residues on beta-hairpin peptide folded structure and stability.

Heath, S.L., Horne, W.S., Lengyel, G.A.

(2023) Org Biomol Chem 21: 6320-6324

• PubMed: 37503895 
• DOI: https://doi.org/10.1039/d3ob00963g
• Primary Citation Related Structures: 
  8T0G, 8T0H, 8T0I


• PubMed Abstract: 
  

  Strategic incorporation of achiral C _α,α -dialkylated amino acids with bulky substituents into peptides can be used to promote extended strand conformations and inhibit protein-protein interactions associated with amyloid formation. In this work, we evaluate the thermodynamic impact of chiral C _α,α monomers on folding preferences in such systems through introduction of a series of C _α -methylated and C _α -ethylated residues into a β-hairpin host sequence. Depending on stereochemical configuration of the artificial monomer and potential for additional hydrophobic packing, a C _α -ethyl-C _α -propyl glycine residue can provide similar or enhanced folded stability relative to an achiral C _α,α -diethyl analogue.

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Organizational Affiliation: 
• Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Department of Chemistry, Slippery Rock University, Slippery Rock, PA 16057, USA. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 1.88 kDa 
• Atom Count: 135 
• Modeled Residue Count: 17 
• Deposited Residue Count: 17 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Immunoglobulin G-binding protein G	A	17	Streptococcus sp. 'group G	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
X60	A	L-PEPTIDE LINKING	C7 H15 N O2		VAL

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2023-08-16 
Deposition Author(s): Heath, S.L., Horne, W.S., Lengyel, G.A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	107161
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	149220

Revision History  

• Version 1.0: 2023-08-16
  Type: Initial release
  
• Version 2.0: 2023-11-15
  Changes: Atomic model, Data collection
• Version 2.1: 2024-10-16
  Changes: Database references, Structure summary