Covalent modification of transthyretin K15 by yielding the fluorescent conjugate (E)-3-(dimethylamino)-5-(4-hydroxy-3,5-dimethylstyryl)benzamide

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Fluorogenic small molecules requiring reaction with a specific protein to create a fluorescent conjugate for biological imaging-what we know and what we need to learn.

Baranczak, A.Connelly, S.Liu, Y.Choi, S.Grimster, N.P.Powers, E.T.Wilson, I.A.Kelly, J.W.

(2014) Biopolymers 101: 484-495

  • DOI: https://doi.org/10.1002/bip.22407
  • Primary Citation of Related Structures:  
    4L1S, 4L1T

  • PubMed Abstract: 

    We seek fluorogenic small molecules that generate a fluorescent conjugate signal if and only if they react with a given protein-of-interest (i.e., small molecules for which noncovalent binding to the protein-of-interest is insufficient to generate fluorescence). Consequently, it is the new chemical entity afforded by the generally irreversible reaction between the small molecule and the protein-of-interest that enables the energy of an electron occupying the lowest unoccupied molecular orbital (LUMO) of the chromophore to be given off as a photon instead of being dissipated by nonradiative mechanisms in complex biological environments. This category of fluorogenic small molecules is created by starting with environmentally sensitive fluorophores that are modified by an essential functional group that efficiently quenches the fluorescence until a chemoselective reaction between that functional group and the protein-of-interest occurs, yielding the fluorescent conjugate. Fluorogenic small molecules are envisioned to be useful for a wide variety of applications, including live cell imaging without the requirement for washing steps and pulse-chase kinetic analyses of protein synthesis, trafficking, degradation, etc.

  • Organizational Affiliation

    Department of Chemistry, The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA, 92037; Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA, 92037.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
127Homo sapiensMutation(s): 0 
Gene Names: TTRPALB
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens)
Explore P02766 
Go to UniProtKB:  P02766
PHAROS:  P02766
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02766
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 1W4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
S-(4-fluorophenyl) 3-(dimethylamino)-5-[(E)-2-(4-hydroxy-3,5-dimethylphenyl)ethenyl]benzenecarbothioate
C25 H24 F N O2 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.632α = 90
b = 86.059β = 90
c = 62.802γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
Blu-Icedata collection
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-10-02
    Type: Initial release
  • Version 1.1: 2014-02-05
    Changes: Database references
  • Version 1.2: 2014-08-20
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description