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 45CR | pdb_000045cr

F171, a fluorinated amino acid-containing CI2 variant, bound to alpha-chymotrypsin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 
    0.180 (Depositor), 0.182 (DCC) 
  • R-Value Work: 
    0.144 (Depositor), 0.145 (DCC) 
  • R-Value Observed: 
    0.145 (Depositor) 

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

Validation slider image for 45CR

This is version 1.0 of the entry. See complete history. 

Literature

In Vitro Selection of Functional Neoproteins Containing Highly Fluorinated Cores.

Beattie, A., Vinogradov, A., Okada, C., Sengoku, T., Katoh, T., Suga, H.

(2026) Angew Chem Int Ed Engl : e5293145-e5293145

  • DOI: https://doi.org/10.1002/anie.5293145
  • Primary Citation Related Structures: 
    45CL, 45CM, 45CN, 45CO, 45CP, 45CQ, 45CR

  • PubMed Abstract: 

    The inclusion of non-proteinogenic amino acids (npAAs) into proteins vastly expands their chemical repertoire and hence possible functional diversity. However, it remains challenging to obtain non-proteinogenic sequences that carry out a specific task. Here we develop a platform to discover functional non-standard proteins and illustrate its utility by generating a family of bioactive proteins whose hydrophobic cores are built using fluorinated amino acids (fAAs). Starting from the protein chymotrypsin inhibitor 2 (CI2), we use genetic code reprogramming, combinatorial mutagenesis and mRNA display-based in vitro selection to discover fluorinated mutant sequences with optimised inhibitory activity. Using microwave-assisted solid-phase peptide synthesis, we perform preparative chemical synthesis of 14 selected proteins, which contain up to eight fAAs-or 19 fluorine atoms. All are nanomolar inhibitors of chymotrypsin; several hits are more active than the wildtype, and possess thermostabilities of up to 70°C. Crystal structures reveal that these proteins maintain native-like folds, with fluorine atoms forming close and epistatically coupled packing contacts within the core. This work demonstrates how to generate functional protein sequences with multiple interacting npAAs, namely neoproteins, and thereby provides a framework for exploring the use of unnatural building blocks in protein design.


  • Organizational Affiliation: 
    • Department of Chemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.

Macromolecule Content 

  • Total Structure Weight: 66.39 kDa 
  • Atom Count: 5,477 
  • Modeled Residue Count: 610 
  • Deposited Residue Count: 616 
  • Unique protein chains: 4

Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  
Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Chymotrypsinogen AA [auth F],
E [auth H]
14Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
Entity Groups
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UniProt GroupP00766
Sequence Annotations
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 2
MoleculeChains  Sequence LengthOrganismDetailsImage
Chymotrypsinogen AB [auth A],
F [auth B]
132Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
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UniProt GroupP00766
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 3
MoleculeChains  Sequence LengthOrganismDetailsImage
Chymotrypsinogen AC [auth E],
G
98Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
Entity Groups
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UniProt GroupP00766
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Reference Sequence
Find similar proteins by:|  3D Structure
Entity ID: 4
MoleculeChains  Sequence LengthOrganismDetailsImage
F171D [auth I],
H [auth C]
64synthetic constructMutation(s): 0 
Entity Groups
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Reference Sequence

Small Molecules

Modified Residues  1 Unique
IDChains Modified ResidueModification TypeFormula2D Diagram
NLE
Query on NLE
LEUNorleucineC6 H13 N O2
Non-standard Monomers  3 Unique
IDChains TypeFormula2D Diagram
3EG
Query on 3EG
L-PEPTIDE LINKINGC4 H6 F3 N O2
A1MJF
Query on A1MJF
L-PEPTIDE LINKINGC6 H9 F2 N O2
OBF
Query on OBF
L-PEPTIDE LINKINGC4 H7 F2 N O2

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free:  0.180 (Depositor), 0.182 (DCC) 
  • R-Value Work:  0.144 (Depositor), 0.145 (DCC) 
  • R-Value Observed: 0.145 (Depositor) 
Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.72α = 90
b = 74.48β = 90
c = 118.17γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Entry History 

& Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of Science (JSPS)Japan--

Revision History  (Full details and data files)

  • Version 1.0: 2026-10-28
    Type: Initial release