7SPX

Crystal structure of photoactive yellow protein (PYP); F28oCNF construct

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.97 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.143 
  • R-Value Observed: 0.145 

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Literature

Nitrile Infrared Intensities Characterize Electric Fields and Hydrogen Bonding in Protic, Aprotic, and Protein Environments.

Weaver, J.B., Kozuch, J., Kirsh, J.M., Boxer, S.G.

(2022) J Am Chem Soc 

  • DOI: 10.1021/jacs.2c00675
  • Primary Citation of Related Structures:  
    7SJJ, 7SPV, 7SPW, 7SPX

  • PubMed Abstract: 

    • Nitriles are widely used vibrational probes; however, the interpretation of their IR frequencies is complicated by hydrogen bonding (H-bonding) in protic environments. We report a new vibrational Stark effect (VSE) that correlates the electric field projected on the -C≡N bond to the transition dipole moment and, by extension, the nitrile peak area or integrated intensity ...

    Nitriles are widely used vibrational probes; however, the interpretation of their IR frequencies is complicated by hydrogen bonding (H-bonding) in protic environments. We report a new vibrational Stark effect (VSE) that correlates the electric field projected on the -C≡N bond to the transition dipole moment and, by extension, the nitrile peak area or integrated intensity. This linear VSE applies to both H-bonding and non-H-bonding interactions. It can therefore be generally applied to determine electric fields in all environments. Additionally, it allows for semiempirical extraction of the H-bonding contribution to the blueshift of the nitrile frequency. Nitriles were incorporated at H-bonding and non-H-bonding protein sites using amber suppression, and each nitrile variant was structurally characterized at high resolution. We exploited the combined information available from variations in frequency and integrated intensity and demonstrate that nitriles are a generally useful probe for electric fields.

    Organizational Affiliation: 

    Department of Chemistry, Stanford University, Stanford, California 94305-5012, United States.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Photoactive yellow proteinA125Halorhodospira halophilaMutation(s): 0 
Gene Names: pyp
UniProt
Find proteins for P16113 (Halorhodospira halophila)
Explore P16113 
Go to UniProtKB:  P16113
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16113
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HC4 (Subject of Investigation/LOI)
Query on HC4
Download Ideal Coordinates CCD File 
B [auth A]4'-HYDROXYCINNAMIC ACID
C9 H8 O3
NGSWKAQJJWESNS-ZZXKWVIFSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.97 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.143 
  • R-Value Observed: 0.145 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.028α = 90
b = 66.028β = 90
c = 40.637γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States2R35GM11804406
National Science Foundation (NSF, United States)United States1915727

Revision History  (Full details and data files)

  • Version 1.0: 2022-05-11
    Type: Initial release