.. -*- coding: utf-8 -*- .. _PDBQT-format: ======================================= PDBQT (Autodock structure) ======================================= .. include:: classes/PDBQT.txt Reading in ========== MDAnalysis reads coordinates from PDBQT_ files and additional optional data such as B-factors, partial charge and AutoDock_ atom types. It is also possible to substitute a PDBQT file for a PSF file in order to define the list of atoms (but no connectivity information will be available in this case). Although PDBQT is a similar file format to PDB, MDAnalysis treats them with several differences: * Multi-model PDBQT files are not supported * Connectivity is not supported (i.e. bonds are not read) .. _PDBQT: http://autodock.scripps.edu/faqs-help/faq/what-is-the-format-of-a-pdbqt-file .. _AutoDock: http://autodock.scripps.edu/ Writing out =========== MDAnalysis implements a subset of the PDB_ 3.2 standard and the PDBQT_ spec. Unlike the :ref:`PDB-format` writer, MDAnalysis cannot write multi-frame trajectories to a PDBQT file. If the Universe is missing fields that are :ref:`required in a PDBQT file `, MDAnalysis provides default values and raises a warning. There are 2 exceptions to this: - ``chainIDs``: if a Universe does not have ``chainIDs``, MDAnalysis uses the first character of the segment ``segid`` instead. - ``elements``: MDAnalysis uses the atom type as the element. These are the default values: * names: 'X' * altLocs: '' * resnames: 'UNK' * icodes: '' * segids: '' * resids: 1 * occupancies: 1.0 * tempfactors: 0.0 * types (elements): '' * charges: 0.0 .. _PDB: http://www.wwpdb.org/documentation/file-format-content/format32/v3.2.html .. _PDBQT: http://autodock.scripps.edu/faqs-help/faq/what-is-the-format-of-a-pdbqt-file .. _pdbqt-spec: PDBQT specification =================== Records read: - **CRYST1** for unit cell dimensions A,B,C, alpha,beta,gamma - **ATOM** or **HETATM** for serial, name, resName, chainID, resSeq, x, y, z, occupancy, tempFactor, segID .. _PDB format documentation: http://www.wwpdb.org/documentation/file-format-content/format32/v3.2.html .. _AutoDOCK extensions: http://autodock.scripps.edu/faqs-help/faq/what-is-the-format-of-a-pdbqt-file .. table:: Original `PDB format documentation`_ with `AutoDOCK extensions`_ ============= ============ =========== ============================================= COLUMNS DATA TYPE FIELD DEFINITION ============= ============ =========== ============================================= 1 - 6 Record name "CRYST1" 7 - 15 Real(9.3) a a (Angstroms). 16 - 24 Real(9.3) b b (Angstroms). 25 - 33 Real(9.3) c c (Angstroms). 34 - 40 Real(7.2) alpha alpha (degrees). 41 - 47 Real(7.2) beta beta (degrees). 48 - 54 Real(7.2) gamma gamma (degrees). 1 - 6 Record name "ATOM " 7 - 11 Integer serial Atom serial number. 13 - 16 Atom name Atom name. 17 Character altLoc Alternate location indicator. IGNORED 18 - 21 Residue name resName Residue name. 22 Character chainID Chain identifier. 23 - 26 Integer resSeq Residue sequence number. 27 AChar iCode Code for insertion of residues. IGNORED 31 - 38 Real(8.3) x Orthogonal coordinates for X in Angstroms. 39 - 46 Real(8.3) y Orthogonal coordinates for Y in Angstroms. 47 - 54 Real(8.3) z Orthogonal coordinates for Z in Angstroms. 55 - 60 Real(6.2) occupancy Occupancy. 61 - 66 Real(6.2) tempFactor Temperature factor. 67 - 76 Real(10.4) partialChrg Gasteiger PEOE partial charge *q*. 79 - 80 LString(2) atomType AutoDOCK atom type *t*. ============= ============ =========== ============================================= We ignore torsion notation and just pull the partial charge and atom type columns:: COMPND NSC7810 REMARK 3 active torsions: REMARK status: ('A' for Active; 'I' for Inactive) REMARK 1 A between atoms: A7_7 and C22_23 REMARK 2 A between atoms: A9_9 and A11_11 REMARK 3 A between atoms: A17_17 and C21_21 ROOT 123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789. (column reference) ATOM 1 A1 INH I 1.054 3.021 1.101 0.00 0.00 0.002 A ATOM 2 A2 INH I 1.150 1.704 0.764 0.00 0.00 0.012 A ATOM 3 A3 INH I -0.006 0.975 0.431 0.00 0.00 -0.024 A ATOM 4 A4 INH I 0.070 -0.385 0.081 0.00 0.00 0.012 A ATOM 5 A5 INH I -1.062 -1.073 -0.238 0.00 0.00 0.002 A ATOM 6 A6 INH I -2.306 -0.456 -0.226 0.00 0.00 0.019 A ATOM 7 A7 INH I -2.426 0.885 0.114 0.00 0.00 0.052 A ATOM 8 A8 INH I -1.265 1.621 0.449 0.00 0.00 0.002 A ATOM 9 A9 INH I -1.339 2.986 0.801 0.00 0.00 -0.013 A ATOM 10 A10 INH I -0.176 3.667 1.128 0.00 0.00 0.013 A ENDROOT BRANCH 9 11 ATOM 11 A11 INH I -2.644 3.682 0.827 0.00 0.00 -0.013 A ATOM 12 A16 INH I -3.007 4.557 -0.220 0.00 0.00 0.002 A ATOM 13 A12 INH I -3.522 3.485 1.882 0.00 0.00 0.013 A ATOM 14 A15 INH I -4.262 5.209 -0.177 0.00 0.00 -0.024 A ATOM 15 A17 INH I -2.144 4.784 -1.319 0.00 0.00 0.052 A ATOM 16 A14 INH I -5.122 4.981 0.910 0.00 0.00 0.012 A ATOM 17 A20 INH I -4.627 6.077 -1.222 0.00 0.00 0.012 A ATOM 18 A13 INH I -4.749 4.135 1.912 0.00 0.00 0.002 A ATOM 19 A19 INH I -3.777 6.285 -2.267 0.00 0.00 0.002 A ATOM 20 A18 INH I -2.543 5.650 -2.328 0.00 0.00 0.019 A BRANCH 15 21 ATOM 21 C21 INH I -0.834 4.113 -1.388 0.00 0.00 0.210 C ATOM 22 O1 INH I -0.774 2.915 -1.581 0.00 0.00 -0.644 OA ATOM 23 O3 INH I 0.298 4.828 -1.237 0.00 0.00 -0.644 OA ENDBRANCH 15 21 ENDBRANCH 9 11 BRANCH 7 24 ATOM 24 C22 INH I -3.749 1.535 0.125 0.00 0.00 0.210 C ATOM 25 O2 INH I -4.019 2.378 -0.708 0.00 0.00 -0.644 OA ATOM 26 O4 INH I -4.659 1.196 1.059 0.00 0.00 -0.644 OA ENDBRANCH 7 24 TORSDOF 3 123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789. (column reference)