Volume 6 Supplement 1
Fragment docking supported by NMR shift perturbations
© Brink et al; licensee Chemistry Central Ltd. 2014
Published: 11 March 2014
Fragment-based approaches have become popular tool in drug design due to their ability to screen large portions of chemical space with comparatively small libraries. However fragments can exhibit unspecific binding and even if they bind to a specific binding site in some cases more than one binding mode is observed . For computational approaches like molecular docking fragments pose also new challenges. Score differences between different binding modes generated by docking are often small, making the identification of the correct, natural binding mode difficult.
The sensitivity of a nuclei's NMR chemical shift to changes in its chemical environment can be used to measure chemical shift perturbations (CSP) of protein atoms upon ligand binding. Especially 1H and 15N CSP are easily obtainable from 15N HSQC spectra and can be used as probe for ligand orientation but also include information about conformational changes on the protein side. CSP data has been used to orientated drug like molecules into protein binding sites [2, 3] and can be included into the scoring function to improve docking .
Here we show how CSP can be used to quickly validate docking poses of smaller fragments by filtering them for their agreement between experimental CSP and simulated CSP for the docked poses. Additionally a more detailed analysis of the differences between the experimental and the simulated CSP profiles can be used to highlight protein regions and even single residues which undergo structural changes upon fragment binding.
- Brough PA, Barril X, Borgognoni J, Chene P, Davies NGM, Davis B, Drysdale MJ, Dymock B, Eccles SA, Garcia-Echeverria C, Fromont C, Hayes A, Hubbard RE, Jordan AM, Jensen MR, Massey A, Merrett A, Padfield A, Parsons R, Radimerski T, Raynaud FI, Robertson A, Roughley SD, Schoepfer J, Simmonite H, Sharp SY, Surgenor A, Valenti M, Walls S, Webb P, Wood M, Workman P, Wright L: Combining Hit Identification Strategies: Fragment-Based and in Silico Approaches to Orally Active 2-Aminothieno[2,3-d]pyrimidine Inhibitors of the Hsp90 Molecular Chaperone. J Med Chem. 2009, 52: 4809-4809.View ArticleGoogle Scholar
- McCoy MA, Wyss DF: Alignment of weakly interacting molecules to protein surfaces using simulations of chemical shift perturbations. J Biomol NMR. 2000, 18: 189-198. 10.1023/A:1026508025631.View ArticleGoogle Scholar
- Cioffi M, Hunter CA, Packer MJ, Spitaleri A: Determination of Protein–Ligand Binding Modes Using Complexation-Induced Changes in 1H NMR Chemical Shift. J Med Chem. 2008, 51: 2512-2517. 10.1021/jm701194r.View ArticleGoogle Scholar
- González-Ruiz D, Gohlke H: Steering Protein−Ligand Docking with Quantitative NMR Chemical Shift Perturbations. J Chem Inf Mod. 2009, 49: 2260-2271. 10.1021/ci900188r.View ArticleGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.