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OH cleavage from tyrosine: debunking a myth

Journal Article · · Journal of Synchrotron Radiation (Online)
 [1];  [2];  [3]
  1. Univ. of Oxford (United Kingdom). Lab. of Molecular Biophysics; University of Oxford
  2. Univ. of Notre Dame, IN (United States). Radiation Lab.
  3. Univ. of Oxford (United Kingdom). Lab. of Molecular Biophysics

During macromolecular X-ray crystallography experiments, protein crystals held at 100 K have been widely reported to exhibit reproducible bond scission events at doses on the order of several MGy. With the objective to mitigate the impact of radiation damage events on valid structure determination, it is essential to correctly understand the radiation chemistry mechanisms at play. OH-cleavage from tyrosine residues is regularly cited as amongst the most available damage pathways in protein crystals at 100 K, despite a lack of widespread reports of this phenomenon in protein crystal radiation damage studies. Furthermore, no clear mechanism for phenolic C—O bond cleavage in tyrosine has been reported, with the tyrosyl radical known to be relatively robust and long-lived in both aqueous solutions and the solid state. Here, the initial findings of Tyr –OH group damage in a myrosinase protein crystal have been reviewed. Consistent with that study, at increasing doses, clear electron density loss was detectable local to Tyr –OH groups. A systematic investigation performed on a range of protein crystal damage series deposited in the Protein Data Bank has established that Tyr –OH electron density loss is not generally a dominant damage pathway in protein crystals at 100 K. Full Tyr aromatic ring displacement is here proposed to account for instances of observable Tyr –OH electron density loss, with the original myrosinase data shown to be consistent with such a damage model. Also presented are systematic analysis of the effects of other environmental factors, including solvent accessibility and proximity to disulfide bonds or hydrogen bond interactions. Residues in known active sites showed enhanced sensitivity to radiation-induced disordering, as has previously been reported.

Research Organization:
Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Engineering and Physical Sciences Research Council (EPSRC); Univ. of Oxford (United Kingdom)
Grant/Contract Number:
FC02-04ER15533
OSTI ID:
1427170
Alternate ID(s):
OSTI ID: 22735824
Journal Information:
Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Journal Issue: 1 Vol. 24; ISSN 1600-5775; ISSN JSYRES
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

References (57)

Automated electron-density sampling reveals widespread conformational polymorphism in proteins: Electron-density Sampling Detects Hidden Ensembles journal May 2010
The ‘fingerprint’ that X-rays can leave on structures journal March 2000
The crystal structures of Sinapis alba myrosinase and a covalent glycosyl–enzyme intermediate provide insights into the substrate recognition and active-site machinery of an S-glycosidase journal May 1997
Prostaglandin H synthase: Resolved and unresolved mechanistic issues journal January 2010
Methionine oxidation by reactive oxygen species: reaction mechanisms and relevance to Alzheimer's disease journal January 2005
Primary photochemistry and energetics leading to the oxidation of the (Mn)4Ca cluster and to the evolution of molecular oxygen in Photosystem II journal February 2008
An assessment of the resolution limitation due to radiation-damage in X-ray diffraction microscopy journal March 2009
Observation of Decreased Radiation Damage at Higher Dose Rates in Room Temperature Protein Crystallography journal December 2007
Radical Initiation in the Class I Ribonucleotide Reductase:  Long-Range Proton-Coupled Electron Transfer? journal June 2003
Free Radical Catalysis by Galactose Oxidase journal June 2003
Proton-Coupled Electron Transfer in Cytochrome Oxidase journal December 2010
Thermochemistry and kinetics of sulfur-containing molecules and radicals journal February 1978
Reactivity of hydroxyl with tyrosine in aqueous solution studied by pulse radiolysis journal May 1984
Evidence for β Scission in the Oxidation of Amino Acids journal May 2002
Soft X-ray Induced Decomposition of Phenylalanine and Tyrosine:  A Comparative Study journal May 2004
Structure and mobility of electron gain and loss centres in proteins journal December 1987
Experimental determination of the radiation dose limit for cryocooled protein crystals journal March 2006
Predicting the X-ray lifetime of protein crystals journal December 2013
Electron spin Resonance of an Irradiated Single Crystal of L-Tyrosine-Hcl journal February 1969
Specific chemical and structural damage to proteins produced by synchrotron radiation journal January 2000
High Resolution X-ray Crystallography Shows That Ascorbate Is a Cofactor for Myrosinase and Substitutes for the Function of the Catalytic Base journal September 2000
Cryo-protection of protein crystals against radiation damage in electron and X-ray diffraction journal July 1990
X-ray absorption by macromolecular crystals: the effects of wavelength and crystal composition on absorbed dose journal July 2004
Phaser crystallographic software journal July 2007
RADDOSE-3D : time- and space-resolved modelling of dose in macromolecular crystallography journal June 2013
Crystallographic fast Fourier transforms journal March 1973
Improving radiation-damage substructures for RIP journal August 2005
Photoreduction of the active site of the metalloprotein putidaredoxin by synchrotron radiation journal August 2007
PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
Know your dose: RADDOSE journal March 2010
Features and development of Coot journal March 2010
Radiation damage in macromolecular crystallography: what is it and why should we care? journal March 2010
X-ray-induced deterioration of disulfide bridges at atomic resolution journal September 2010
Overview of the CCP 4 suite and current developments journal March 2011
REFMAC 5 for the refinement of macromolecular crystal structures journal March 2011
Statistical quality indicators for electron-density maps journal March 2012
Outrunning free radicals in room-temperature macromolecular crystallography journal June 2012
Insights into the mechanism of X-ray-induced disulfide-bond cleavage in lysozyme crystals based on EPR, optical absorption and X-ray diffraction studies journal November 2013
Structural changes in a cryo-cooled protein crystal owing to radiation damage journal March 2000
Evidence for the formation of disulfide radicals in protein crystals upon X-ray irradiation journal November 2002
Investigation of possible free-radical scavengers and metrics for radiation damage in protein cryocrystallography journal November 2002
Specific radiation damage to acidic residues and its relation to their chemical and structural environment journal December 2006
Absorbed dose calculations for macromolecular crystals: improvements to RADDOSE journal February 2009
A beginner's guide to radiation damage journal February 2009
Effective scavenging at cryotemperatures: further increasing the dose tolerance of protein crystals journal April 2011
Similarities and differences in radiation damage at 100 K versus 160 K in a crystal of thermolysin journal April 2011
Radiation damage to nucleoprotein complexes in macromolecular crystallography journal January 2015
Identifying and quantifying radiation damage at the atomic level journal February 2015
Radiation damage to macromolecules: kill or cure? journal February 2015
The PDB_REDO server for macromolecular structure model optimization journal May 2014
DIALS – a toolbox for diffraction data analysis journal August 2014
Radiation damage and derivatization in macromolecular crystallography: a structure factor's perspective journal March 2016
RNA protects a nucleoprotein complex against radiation damage journal April 2016
Strain relief at the active site of phosphoserine aminotransferase induced by radiation damage journal June 2005
Radiation Chemical Reactions in Aqueous Solutions of Methionine and Its Peptides journal February 1967
Pulse Radiolysis of Phenylalanine and Tyrosine journal March 1968
Exploring oxidative modifications of tyrosine: An update on mechanisms of formation, advances in analysis and biological consequences journal March 2015

Cited By (15)

Direct Radiation Effects on the Structure and Stability of Collagen and Other Proteins journal August 2019
Atomic displacement parameters in structural biology journal May 2018
RIDL : a tool to investigate radiation-induced density loss journal May 2018
Real-space analysis of radiation-induced specific changes with independent component analysis journal February 2018
Real-space analysis of radiation-induced specific changes with independent component analysis text January 2018
Real-space analysis of radiation-induced specific changes with independent component analysis text January 2018
Comprehensive model for X-ray-induced damage in protein crystallography journal May 2019
Comprehensive model for X-ray-induced damage in protein crystallography text January 2019
Structural knowledge or X-ray damage? A case study on xylose isomerase illustrating both journal June 2019
The potential benefits of using higher X-ray energies for macromolecular crystallography journal June 2019
The potential benefits of using higher X-ray energies for macromolecular crystallography text January 2019
Radiation-damage investigation of a DNA 16-mer journal June 2019
Radiation-damage investigation of a DNA 16-mer text January 2019
The potential benefits of using higher X-ray energies for macromolecular crystallography journal August 2019
Direct Radiation Effects on the Structure and Stability of Collagen and Other Proteins text January 2019

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