Charge density refinement at ultra high resolution with MoPro software. Christian Jelsch CNRS Université de Lorraine
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1 Charge density refinement at ultra high resolution with MoPro software Christian Jelsch CNRS Université de Lorraine Laboratoire de Cristallographie & Résonance Magnétique & Modélisations (CRM2) Nancy, France Crystallographic Computing School Rovinj Croatia ECM August
2 1) Crystallography at ultra high resolution 2) The MoPro software for electron density analysis 3) Derived Properties / Exemple of applications 4) Practical training on the software MoPro 2
3 WHAT IS OBSERVABLE by X Ray CRISTALLOGRAPHY RESOLUTION HIGH d 2 Å X Y Z Thermal B factor isotropic (Protein crystallography) ATOMIC d 1 Å Thermal B anisotropic Hydrogen atoms SUB-ATOMIC Deformation of or Electron Density ULTRA HIGH d 0.5 Å Atomic Charges 3
4 Spherical Atom Model Fourier Residual Electron Density: F obs F calc Usual crystallography : spherical atoms Resolution 0.5 Å or sin / = 1 Å 1 Residual peaks on covalent bonds 2 (indol 3 yl) 1,1,3,3 tetramethylthiouronium nitrate Lutz et al. Acta Cryst. (2008). C64, 4
5 Multipolar Atom Model atom (r) = core (r) + P val 3 val ( r) <1 >1 + l ' 3 R l ( r) m P lm Y lm P val valence population expansion/contraction Hansen & Coppens (1978) P lm multipoles Acta Cryst. A34, 909 5
6 Multipoles & Deformation Electron Density Example : sp 2 Carbon atom Octupole C 6
![+y 2 )] x(x 2 3y 2 )](/docs-images/72/67120169/images/7-3.jpg "y(y 2 3x 2 ) xyz (x 2")
7 Z Multipoles 3 dipoles 5 quadripoles X Y Local axes system 7 octupoles 2z 3-3z(x 2 +y 2 ) x[4z 2 (x 2 +y 2 )] y[4z 2 (x 2 +y 2 )] x(x 2 3y 2 ) y(y 2 3x 2 ) xyz (x 2 -y 2 )z 7
8 Deformation of Electron Density = molecule - isolated atoms multipolar neutral & spherical O Static : computed for atoms at rest O H +/ e-/å 3 8
9 2) The MoPro software for electron density analysis 9
10 MOPRO Crystallographic Refinement Software Subatomic Resolution ~0.5Å Structure & Electron Density Atomic Resolution Structure with Hydrogen Atoms Å Transfer Electron Density Databank Small Compounds & Biological Macromolecules Developped at CRM2 laboratory, Nancy, Lorraine University Jelsch et al. J. Appl. Cryst. (2005) 38, Guillot Acta Cryst A. (2012). A68, s
11 LEAST SQUARES MINIMIZATION Program MoPro Minimizes E = H w H ( H calc - H obs ) 2 + r [( R calc - R target ) / r ] 2 RESTRAINTS : introduce additionnal information into the system Erestrain H=(h,k,l) reflection intensity R restraints r R calc R target 11
12 Some RESTRAINTS/ CONSTRAINTS in MoPro P P target P = P target R/C Distance R/C Angle R/C R Planarity Similar Distances D1 D2 Stereochemistry R Similar Angles A1 A2 R/C R/C R/C Similar Valence Populations Similar Multipoles Similar Expansion/ Contraction coef Charge density 12
13 Database of Multipolar Atoms TRANSFER Experimental Charge Density of of Small Compounds Crystals PROTEINS or or SMALL COMPOUNDS at at lower Resolution Compute Molecular Properties 13
14 3) Derived Properties Exemple of applications 14
15 Electrostatic Potential the Multipolar Atom Model derived from V(r) = q i / r i + (r) / r i d 3 r Fidarestat Inhitor of protein aldose reductase (r) deformation density accumulation/depletion Color surface according to V(r) + / 15
16 Electrostatic Interaction Energy between dimers in the crystal packing Paracetamol Bouhmaida et al. Acta Cryst B 2009 Closest interacting atoms 16
17 Topological Analysis Total electron density Laplacian 2 = 2 / x / y / z 2 Negative Laplacian in red : Electron accumulation 2 < 0 Gradient lines of Atomic Basins: (Atoms In Molecules ; Richard Bader ) ( r ). n S ( r ) 0 n Surface S Integrated Property : atomic charges 17
18 Topological Analysis : Critical Points Places where the gradient of total electron density is zero Bond paths * CP Saddle CP Permits to caracterize nature & force of interactions (hydrogen bonds) H ij i r x x 2 Diagonalization of Hessian matrix: j Ellipticity of a covalent bond : bonding 18
19 5) Practical presentation of the software MoPro MoProSuite Molecular Viewer & GUI 19
20 MoProSuite Software components MoProGUI general Graphical User Interface Import2MoPro read.cif.pdb.xyz.res files MoPro Crystallographic refinements VMoPro Calculation of Molecular Properties (density, potential, Laplacian..) MoProViewer Molecular Viewer & GUI 20
21 MoProGUI menu 21
22 MoProGUI / MoPro Main Menus. File declarations 22
23 MoProViewer developed by Benoît Guillot, University Lorraine 23
24 MoProViewer : a recent functionnality Automatic calculation of Hirshfeld surface of a molecule In its crystal packing Coloring according to interior or exterior atom types Statistical analysis of crystal contacts cf Jelsch et al. IUCrJ (2014). 1,
25 RECENT extensions/improvements in MoPro * Multipoles beyond hexadecapoles L=5 & L=6 * Several Kappa2 parameters for an atom (each multipole level) * Enhanced rigid-bond restraints (Thorn, Dittrich & Sheldrick, 2012, Acta Cryst A) * Eigenvalue filtering [ Radek Kaminski, Warsaw ] * Block diagonal refinement 25
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