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Pregled bibliografske jedinice broj: 544760


Autori: Kuzmanić, Antonija; Kruschel, Daniela; van Gunsteren, Wilfred; Pannu, Navraj; Žagrović, Bojan
Naslov: Dynamics may significantly influence the estimation of interatomic distances in biomolecular X-ray structures.
Izvornik: Journal of molecular biology (0022-2836) 411 (2011), 1; 286-297
Vrsta rada: članak
Ključne riječi: molecular dynamics; B-factors; averaging; molecular replacement; refinement
Atomic positions obtained by X-ray crystallography are time and space averages over many molecules in the crystal. Importantly, interatomic distances, calculated between such average positions and frequently used in structural and mechanistic analyses, can be substantially different from the more appropriate time-average and ensemble-average interatomic distances. Using crystallographic B-factors, one can deduce corrections, which have so far been applied exclusively to small molecules, to obtain correct average distances as a function of the type of atomic motion. Here, using 4774 high-quality protein X-ray structures, we study the significance of such corrections for different types of atomic motion. Importantly, we show that for distances shorter than 5 Å, corrections greater than 0.5 Å may apply, especially for noncorrelated or anticorrelated motion. For example, 14% of the studied structures have at least one pair of atoms with a correction of ≥ 0.5 Å in the case of noncorrelated motion. Using molecular dynamics simulations of villin headpiece, ubiquitin, and SH3 domain unit cells, we demonstrate that the majority of average interatomic distances in these proteins agree with noncorrelated corrections, suggesting that such deviations may be truly relevant. Importantly, we demonstrate that the corrections do not significantly affect stereochemistry and the overall quality of final refined X-ray structures, but can provide marked improvements in starting unrefined models obtained from low-resolution Xray data. Finally, we illustrate the potential mechanistic and biological significance of the calculated corrections for KcsA ion channel and show that they provide indirect evidence that motions in its selectivity filter are highly correlated.
Projekt / tema: 177-1770495-0476
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
URL Internet adrese:
Broj citata:
DOI: 10.1016/j.jmb.2011.05.033
URL cjelovitog teksta:
Google Scholar: Dynamics may significantly influence the estimation of interatomic distances in biomolecular X-ray structures.
Upisao u CROSBI: (, 18. Stu. 2011. u 13:00 sati

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