1OTD

STRONG HYDROGEN BONDS IN PHOTOACTIVE YELLOW PROTEIN AND THEIR ROLE IN ITS PHOTOCYCLE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.171 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Short hydrogen bonds in photoactive yellow protein.

Anderson, S.Crosson, S.Moffat, K.

(2004) Acta Crystallogr D Biol Crystallogr 60: 1008-1016

  • DOI: https://doi.org/10.1107/S090744490400616X
  • Primary Citation of Related Structures:  
    1OT6, 1OT9, 1OTA, 1OTB, 1OTD, 1OTE, 1OTI

  • PubMed Abstract: 

    Eight high-resolution crystal structures of the ground state of photoactive yellow protein (PYP) solved under a variety of conditions reveal that its chromophore is stabilized by two unusually short hydrogen bonds. Both Tyr42 Oeta and Glu46 Oepsilon are separated from the chromophore phenolate oxygen by less than the sum of their atomic van der Waals radii, 2.6 angstroms. This is characteristic of strong hydrogen bonding, in which hydrogen bonds acquire significant covalent character. The hydrogen bond from the protonated Glu46 to the negatively charged phenolate oxygen is 2.58 +/- 0.01 angstroms in length, while that from Tyr42 is considerably shorter, 2.49 +/- 0.01 angstroms. The E46Q mutant was solved to 0.95 angstroms resolution; the isosteric mutation increased the length of the hydrogen bond from Glx46 to the chromophore by 0.29 +/- 0.01 angstroms to that of an average hydrogen bond, 2.88 +/- 0.01 angstroms. The very short hydrogen bond from Tyr42 explains why mutating this residue has such a severe effect on the ground-state structure and PYP photocycle. The effect of isosteric mutations on the photocycle can be largely explained by the alterations to the length and strength of these hydrogen bonds.


  • Organizational Affiliation

    Consortium for Advanced Radiation Sources, University of Chicago, USA. [email protected]


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Photoactive yellow protein
A, B
125Halorhodospira 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
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.983α = 90
b = 91.102β = 92.67
c = 36.756γ = 90
Software Package:
Software NamePurpose
SHELXL-97refinement
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-05-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Experimental preparation
  • Version 1.4: 2019-07-24
    Changes: Data collection, Derived calculations, Refinement description
  • Version 1.5: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description