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X‐ray radiation‐induced addition of oxygen atoms to protein residues
Author(s) -
Wang Jimin
Publication year - 2016
Publication title -
protein science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.353
H-Index - 175
eISSN - 1469-896X
pISSN - 0961-8368
DOI - 10.1002/pro.2934
Subject(s) - protein crystallization , chemistry , radical , crystallography , protein data bank (rcsb pdb) , photosystem ii , molecule , crystal structure , x ray crystallography , x ray , peroxide , protein structure , oxygen , photochemistry , diffraction , stereochemistry , biochemistry , organic chemistry , crystallization , photosynthesis , optics , physics
The additions of oxygen and peroxide to residues that result when proteins are exposed to the free radicals produced using the Fenton reaction or X‐rays have been studied for over a century. Nevertheless little is known about the impact these modifications have on protein crystal structures. Here evidence is presented that both kinds of modifications occur in protein crystals on a significant scale during the collection of X‐ray diffraction data. For example, at least 538 of the 5,351 residues of protein molecules in the crystal used to obtain the structure for photosystem II described by the PDB accession number 3ARC became oxygenated during data collection.