Journal
PROTEIN SCIENCE
Volume 25, Issue 9, Pages 1753-1756Publisher
WILEY-BLACKWELL
DOI: 10.1002/pro.2970
Keywords
X-ray crystal structures; stereochemical restrains; structure validation; guanidinium geometry; arginine residues
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Funding
- Intramural Research Program of the National Cancer Institute, Center for Cancer Research
- National Cancer Institute, National Institutes of Health [HHSN261200800E]
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The restraints in common usage today have been obtained based on small molecule X-ray crystal structures available 25 years ago and recent reports have shown that the values of bond lengths and valence angles can be, in fact, significantly different from those stored in libraries, for example for the peptide bond or the histidine ring geometry. We showed that almost 50% of outliers found in protein validation reports released in the Protein Data Bank on 23 March 2016 come from geometry of guanidine groups in arginines. Therefore, structures of small molecules and atomic resolution protein crystal structures have been used to derive new target values for the geometry of this group. The most significant difference was found for NE-CZ-NH1 and NE-CZ-NH2 angles, showing that the guanidinium group is not symmetric. The NE-CZ-NH1 angle is larger, 121.5(10), than NE-CZ-NH2, 119.2(10), due to the repulsive interaction between NH1 and CD1 atom.
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