6E5I

Heterogeneous-Backbone Mimics of a Designed Disulfide-Rich Protein: Orn turn

• PDB DOI: https://doi.org/10.2210/pdb6E5I/pdb
• BMRB: 30497

• Classification: DE NOVO PROTEIN
• Organism(s): synthetic construct
• Mutation(s): No 


• Deposited: 2018-07-20 Released: 2018-11-21 
• Deposition Author(s): Cabalteja, C.C., Mihalko, D.S., Horne, W.S.
• 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

Heterogeneous-Backbone Foldamer Mimics of a Computationally Designed, Disulfide-Rich Miniprotein.

Cabalteja, C.C., Mihalko, D.S., Horne, W.S.

(2019) Chembiochem 20: 103-110

• PubMed: 30326175 
• DOI: https://doi.org/10.1002/cbic.201800558
• Primary Citation of Related Structures:  
  6E5H, 6E5I, 6E5J, 6E5K


• PubMed Abstract: 
  

  Disulfide-rich peptides have found widespread use in the development of bioactive agents; however, low proteolytic stability and the difficulty of exerting synthetic control over chain topology present barriers to their application in some systems. Herein, we report a method that enables the creation of artificial backbone ("foldamer") mimics of compact, disulfide-rich tertiary folds. Systematic replacement of a subset of natural α-residues with various artificial building blocks in the context of a computationally designed prototype sequence leads to "heterogeneous-backbone" variants that undergo clean oxidative folding, adopt tertiary structures indistinguishable from that of the prototype, and enjoy proteolytic protection beyond that inherent to the topologically constrained scaffold. Collectively, these results demonstrate systematic backbone substitution to be a viable method to engineer the properties of disulfide-rich sequences and expands the repertoire of protein mimicry by foldamers to an exciting new structural class.

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Organizational Affiliation: 

Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.23 kDa 
• Atom Count: 223 
• Modelled Residue Count: 27 
• Deposited Residue Count: 27 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Designed peptide NC_HEE_D1: Orn turn mutant	A	27	synthetic construct	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ORN	A	L-PEPTIDE LINKING	C5 H12 N2 O2		ALA

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: 2018-11-21 
Deposition Author(s): Cabalteja, C.C., Mihalko, D.S., Horne, W.S.

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

Revision History  

• Version 1.0: 2018-11-21
  Type: Initial release
  
• Version 1.1: 2019-01-16
  Changes: Data collection, Database references
• Version 1.2: 2020-01-01
  Changes: Author supporting evidence, Data collection