Source code for xmipp3.protocols.protocol_convert_pdb

# -*- coding: utf-8 -*-
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# * Authors:  Jesus Cuenca (
# *           Roberto Marabini (
# *           Ignacio Foche
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# * Unidad de  Bioinformatica of Centro Nacional de Biotecnologia , CSIC
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import pyworkflow.protocol.params as params
import pyworkflow.protocol.constants as const
from pyworkflow.utils import replaceBaseExt, removeExt, getExt

from pwem.convert import cifToPdb, downloadPdb, headers
from pwem.objects import Volume, Transform
from pwem.protocols import ProtInitialVolume

[docs]class XmippProtConvertPdb(ProtInitialVolume): """ Convert a PDB file into a volume. """ _label = 'convert a PDB' IMPORT_FROM_ID = 0 IMPORT_OBJ = 1 IMPORT_FROM_FILES = 2 # --------------------------- DEFINE param functions -------------------------------------------- def _defineParams(self, form): """ Define the parameters that will be input for the Protocol. This definition is also used to generate automatically the GUI. """ form.addSection(label='Input') form.addParam('inputPdbData', params.EnumParam, choices=['id', 'object', 'file'], label="Retrieve PDB from", default=self.IMPORT_FROM_ID, display=params.EnumParam.DISPLAY_HLIST, help='Retrieve PDB data from server, use a pdb Object, or a local file') form.addParam('pdbId', params.StringParam, condition='inputPdbData == IMPORT_FROM_ID', label="Pdb Id ", allowsNull=True, help='Type a pdb Id (four alphanumeric characters).') form.addParam('pdbObj', params.PointerParam, pointerClass='AtomStruct', label="Input pdb ", condition='inputPdbData == IMPORT_OBJ', allowsNull=True, help='Specify a pdb object.') form.addParam('pdbFile', params.FileParam, label="File path", condition='inputPdbData == IMPORT_FROM_FILES', allowsNull=True, help='Specify a path to desired PDB structure.') form.addParam('sampling', params.FloatParam, default=1.0, label="Sampling rate (Å/px)", help='Sampling rate (Angstroms/pixel)') form.addParam('vol', params.BooleanParam, label='Use a volume as an empty template?', default=False, help='Use an existing volume to define the size and origin for the output volume. If this option' 'is selected, make sure that "Center PDB" in advanced parameters is set to *No*.') form.addParam('volObj', params.PointerParam, pointerClass='Volume', label="Input volume ", condition='vol', allowsNull=True, help='The origin and the final size of the output volume will be taken from this volume.') form.addParam('setSize', params.BooleanParam, label='Set final size?', default=False, condition='vol == False') form.addParam('size_z', params.IntParam, condition='setSize', allowsNull=True, label="Final size (px) Z", help='Final size in Z in pixels. If no value is provided, protocol will estimate it.') form.addParam('size_y', params.IntParam, condition='setSize', allowsNull=True, label="Final size (px) Y", help='Final size in Y in pixels. If no value is provided, protocol will estimate it.') form.addParam('size_x', params.IntParam, condition='setSize', allowsNull=True, label="Final size (px) X", help='Final size in X in pixels. If desired output size is x = y = z you can only fill this ' 'field. If no value is provided, protocol will estimate it.') form.addParam('centerPdb', params.BooleanParam, default=True, expertLevel=const.LEVEL_ADVANCED, label="Center PDB", help='Center PDB with the center of mass') # --------------------------- INSERT steps functions -------------------------------------------- def _insertAllSteps(self): """ In this function the steps that are going to be executed should be defined. Two of the most used functions are: _insertFunctionStep or _insertRunJobStep """ if self.inputPdbData == self.IMPORT_FROM_ID: self._insertFunctionStep('pdbDownloadStep') self._insertFunctionStep('convertPdbStep') self._insertFunctionStep('createOutput') # --------------------------- STEPS functions --------------------------------------------
[docs] def pdbDownloadStep(self): """Download all pdb files in file_list and unzip them.""" downloadPdb(self.pdbId.get(), self._getPdbFileName(), self._log)
[docs] def convertPdbStep(self): """ Although is not mandatory, usually is used by the protocol to register the resulting outputs in the database. """ pdbFn = self._getPdbFileName() outFile = removeExt(self._getVolName()) if getExt(pdbFn)==".cif": pdbFn2=replaceBaseExt(pdbFn, 'pdb') cifToPdb(pdbFn, pdbFn2) pdbFn = pdbFn2 samplingR = self.sampling.get() args = '-i %s --sampling %f -o %s' % (pdbFn, samplingR, outFile) if self.centerPdb: args += ' --centerPDB' if self.vol: vol = self.volObj.get() size = vol.getDim() ccp4header = headers.Ccp4Header(vol.getFileName(), readHeader=True) self.shifts = ccp4header.getOrigin() args += ' --size %d %d %d --orig %d %d %d' % (size[2], size[1], size[0], self.shifts[0]/samplingR, self.shifts[1]/samplingR, self.shifts[2]/samplingR) if self.setSize: args += ' --size' if self.size_x.hasValue(): args += ' %d' % self.size_x.get() if self.size_y.hasValue() and self.size_z.hasValue(): args += ' %d %d' % (self.size_y.get(), self.size_z.get())"Input file: " + pdbFn)"Output file: " + outFile) program = "xmipp_volume_from_pdb" self.runJob(program, args)
[docs] def createOutput(self): volume = Volume() volume.setSamplingRate(self.sampling.get()) volume.setFileName(self._getVolName()) if self.vol: origin = Transform() origin.setShiftsTuple(self.shifts) volume.setOrigin(origin) self._defineOutputs(outputVolume=volume) if self.inputPdbData == self.IMPORT_OBJ: self._defineSourceRelation(self.pdbObj, volume)
# --------------------------- INFO functions -------------------------------------------- def _summary(self): """ Even if the full set of parameters is available, this function provides summary information about an specific run. """ summary = [] # Add some lines of summary information if not hasattr(self, 'outputVolume'): summary.append("outputVolume not ready yet.") else: if self.inputPdbData == self.IMPORT_FROM_ID: summary.append("Input PDB ID: %s" % self.pdbId.get()) elif self.inputPdbData == self.IMPORT_OBJ: summary.append("Input PDB File: %s" % self.pdbObj.get().getFileName()) else: summary.append("Input PDB File: %s" % self.pdbFile.get()) return summary def _validate(self): """ The function of this hook is to add some validation before the protocol is launched to be executed. It should return a list of errors. If the list is empty the protocol can be executed. """ errors = [] if self.inputPdbData == self.IMPORT_FROM_ID: lenStr = len(self.pdbId.get()) if lenStr != 4: errors = ["Pdb id is composed only by four alphanumeric characters"] return errors # --------------------------- UTLIS functions -------------------------------------------- def _getPdbFileName(self): if self.inputPdbData == self.IMPORT_FROM_ID: return self._getExtraPath('%s.cif' % self.pdbId.get()) elif self.inputPdbData == self.IMPORT_OBJ: return self.pdbObj.get().getFileName() else: return self.pdbFile.get() def _getVolName(self): return self._getExtraPath(replaceBaseExt(self._getPdbFileName(), "vol"))