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## NAME

ExtractFromPDBFiles.pl - Extract specific data from PDBFile(s)

## SYNOPSIS

ExtractFromPDBFiles.pl PDBFile(s)...

ExtractFromPDBFiles.pl [-a, --Atoms "AtomNum, [AtomNum...]" | "StartAtomNum, EndAtomNum" | "AtomName, [AtomName...]"] [-c, --chains First | All | "ChainID, [ChainID,...]"] [<--CombineChains> yes | no] [-d, --distance number] [--DistanceMode Atom | Hetatm | Residue | XYZ] [--DistanceOrigin "AtomNumber, AtomName" | "HetatmNumber, HetAtmName" | "ResidueNumber, ResidueName, [ChainID]" | "X,Y,Z">] [<--DistanceSelectionMode> ByAtom | ByResidue] [-h, --help] [-k, --KeepOldRecords yes | no] [-m, --mode Chains | Sequences | Atoms | CAlphas | AtomNums | AtomsRange | AtomNames | ResidueNums | ResiduesRange | ResidueNames | Distance | NonWater | NonHydrogens] [--ModifyHeader yes | no] [--NonStandardKeep yes | no] [--NonStandardCode character] [-o, --overwrite] [-r, --root rootname] --RecordMode Atom | Hetatm | AtomAndHetatm] [--Residues "ResidueNum,[ResidueNum...]" | StartResidueNum,EndResiduNum ] [--SequenceLength number] [--SequenceRecords Atom | SeqRes] [--SequenceIDPrefix FileName | HeaderRecord | Automatic] [--WaterResidueNames Automatic | "ResidueName, [ResidueName,...]"] [-w, --WorkingDir dirname] PDBFile(s)...

## DESCRIPTION

Extract specific data from PDBFile(s) and generate appropriate PDB or sequence file(s). Multiple PDBFile names are separated by spaces. The valid file extension is .pdb. All other file name extensions are ignored during the wild card expansion. All the PDB files in a current directory can be specified either by *.pdb or the current directory name.

During Chains and Sequences values of -m, --mode option, all ATOM/HETAM records for chains after the first model in PDB fils containing data for multiple models are ignored.

## OPTIONS

-a, --Atoms "AtomNum,[AtomNum...]" | "StartAtomNum,EndAtomNum" | "AtomName,[AtomName...]"

  Specify which atom records to extract from PDBFiles(s) during AtomNums, AtomsRange, and AtomNames value of -m, --mode option: extract records corresponding to atom numbers specified in a comma delimited list of atom numbers/names, or with in the range of start and end atom numbers. Possible values: "AtomNum[,AtomNum,..]", StartAtomNum,EndAtomNum, or "AtomName[,AtomName,..]". Default: None. Examples:

  10
  15,20
  N,CA,C,O
-c, --chains First | All | ChainID,[ChainID,...]

  Specify which chains to extract from PDBFile(s) during Chains | Sequences value of -m, --mode option: first chain, all chains, or a specific list of comma delimited chain IDs. Possible values: First | All | ChainID,[ChainID,...]. Default: First. Examples:

  A
  A,B
  All
--CombineChains yes | no

  Specify whether to combine extracted chains data into a single file during Chains or Sequences value of -m, --mode option. Possible values: yes | no. Default: no.

  During Chains value of <-m, --mode> option with Yes value of <--CombineChains>, extracted data for specified chains is written into a single file instead of individual file for each chain.

  During Sequences value of <-m, --mode> option with Yes value of <--CombineChains>, residues sequences for specified chains are extracted and concatenated into a single sequence file instead of individual file for each chain.

-d, --distance number

  Specify distance used to extract ATOM/HETATM recods during Distance value of -m, --mode option. Default: 10.0 angstroms.

  --RecordMode option controls type of record lines to extract from PDBFile(s): ATOM, HETATM or both.

--DistanceMode Atom | Hetatm | Residue | XYZ

  Specify how to extract ATOM/HETATM records from PDBFile(s) during Distance value of -m, --mode option: extract all the records within a certain distance specifed by -d, --distance from an atom or hetro atom record, a residue, or any artbitrary point. Possible values: Atom | Hetatm | Residue | XYZ. Default: XYZ.

  During Residue value of --distancemode, distance of ATOM/HETATM records is calculated from all the atoms in the residue and the records are selected as long as any atom of the residue lies with in the distace specified using -d, --distance option.

  --RecordMode option controls type of record lines to extract from PDBFile(s): ATOM, HETATM or both.

--DistanceSelectionMode ByAtom | ByResidue

  Specify how how to extract ATOM/HETATM records from PDBFile(s) during Distance value of -m, --mode option for all values of --DistanceMode option: extract only those ATOM/HETATM records that meet specified distance criterion; extract all records corresponding to a residue as long as one of the ATOM/HETATM record in the residue satisfies specified distance criterion. Possible values: ByAtom, ByResidue. Default value: ByAtom.

--DistanceOrigin "AtomNumber,AtomName" | "HetatmNumber,HetAtmName" | "ResidueNumber,ResidueName[,ChainID]" | "X,Y,Z"

  This value is --distancemode specific. In general, it identifies a point used to select other ATOM/HETATMS with in a specific distance from this point.

  For Atom value of --distancemode, this option corresponds to an atom specification. Format: AtomNumber,AtomName. Example:

  455,CA

  For Hetatm value of --distancemode, this option corresponds to a hetatm specification. Format: HetatmNumber,HetAtmName. Example:

  5295,C1

  For Residue value of --distancemode, this option corresponds to a residue specification. Format: ResidueNumber, ResidueName[,ChainID]. Example:

  78,MSE
  977,RET,A
  978,RET,B

  For XYZ value of --distancemode, this option corresponds to a coordinate of an arbitrary point. Format: X,Y,X. Example:

  10.044,19.261,-4.292

  --RecordMode option controls type of record lines to extract from PDBFile(s): ATOM, HETATM or both.

-h, --help

  Print this help message.

-k, --KeepOldRecords yes | no

  Specify whether to transfer old non ATOM and HETATM records from input PDBFile(s) to new PDBFile(s) during Chains | Atoms | HetAtms | CAlphas | Distance| NonWater | NonHydrogens value of -m --mode option. By default, except for the HEADER record, all other unnecessary non ATOM/HETATM records are dropped during the generation of new PDB files. Possible values: yes | no. Default: no.

-m, --mode Chains | Sequences | Atoms | CAlphas | AtomNums | AtomsRange | AtomNames | ResidueNums | ResiduesRange | ResidueNames | Distance | NonWater | NonHydrogens

  Specify what to extract from PDBFile(s): Chains - retrieve records for specified chains; Sequences - generate sequence files for specific chains; Atoms - extract atom records; CAlphas - extract atom records for alpha carbon atoms; AtomNums - extract atom records for specified atom numbers; AtomsRange - extract atom records between specified atom number range; AtomNames - extract atom records for specified atom names; ResidueNums - extract records for specified residue numbers; ResiduesRange - extract records for residues between specified residue number range; ResidueNames - extract records for specified residue names; Distance - extract records with in a certain distance from a specific position; NonWater - extract records corresponding to residues other than water; NonHydrogens - extract non-hydrogen records.

  Possible values: Chains, Sequences Atoms, CAlphas, AtomNums, AtomsRange, AtomNames, ResidueNums, ResiduesRange, ResidueNames, Distance, NonWater, NonHydrogens. Default value: NonWater

  During the generation of new PDB files, unnecessay CONECT records are dropped.

  For Chains mode, data for appropriate chains specified by --c --chains option is extracted from PDBFile(s) and placed into new PDB file(s).

  For Sequences mode, residues names using various sequence related options are extracted for chains specified by --c --chains option from PDBFile(s) and FASTA sequence file(s) are generated.

  For Distance mode, all ATOM/HETATM records with in a distance specified by -d --distance option from a specific atom, residue or a point indicated by --distancemode are extracted and placed into new PDB file(s).

  For NonWater mode, non water ATOM/HETATM record lines, identified using value of --WaterResidueNames, are extracted and written to new PDB file(s).

  For NonHydrogens mode, ATOM/HETATOM record lines containing element symbol other than H are extracted and written to new PDB file(s).

  For all other options, appropriate ATOM/HETATM records are extracted to generate new PDB file(s).

  --RecordMode option controls type of record lines to extract and process from PDBFile(s): ATOM, HETATM or both.

--ModifyHeader yes | no

  Specify whether to modify HEADER record during the generation of new PDB files for -m, --mode values of Chains | Atoms | CAlphas | Distance. Possible values: yes | no. Default: yes. By default, Classification data is replaced by Data extracted using MayaChemTools before writing out HEADER record.

--NonStandardKeep yes | no

  Specify whether to include and convert non-standard three letter residue codes into a code specified using --nonstandardcode option and include them into sequence file(s) generated during Sequences value of -m, --mode option. Possible values: yes | no. Default: yes.

  A warning is also printed about the presence of non-standard residues. Any residue other than standard 20 amino acids and 5 nucleic acid is considered non-standard; additionally, HETATM residues in chains also tagged as non-standard.

--NonStandardCode character

  A single character code to use for non-standard residues. Default: X. Possible values: ?, -, or X.

-o, --overwrite

  Overwrite existing files.

-r, --root rootname

  New PDB and sequence file name is generated using the root: <Root><Mode>.<Ext>. Default new file name: <PDBFileName>Chain<ChainID>.pdb for Chains mode; <PDBFileName>SequenceChain<ChainID>.fasta for Sequences mode; <PDBFileName>DistanceBy<DistanceMode>.pdb for Distance -m, --mode <PDBFileName><Mode>.pdb for Atoms | CAlphas | NonWater | NonHydrogens -m, --mode values. This option is ignored for multiple input files.

--RecordMode Atom | Hetatm | AtomAndHetatm

  Specify type of record lines to extract and process from PDBFile(s) during various values of -m, --mode option: extract only ATOM record lines; extract only HETATM record lines; extract both ATOM and HETATM lines. Possible values: Atom | Hetatm | AtomAndHetatm | XYZ. Default during Atoms, CAlphas, AtomNums, AtomsRange, AtomNames values of -m, --mode option: Atom; otherwise: AtomAndHetatm.

  This option is ignored during Chains, Sequences values of -m, --mode option.

--Residues "ResidueNum,[ResidueNum...]" | "StartResidueNum,EndResiduNum" | "ResidueName,[ResidueName...]"

  Specify which resiude records to extract from PDBFiles(s) during ResidueNums, ResiduesRange,and ResidueNames value of -m, --mode option: extract records corresponding to residue numbers specified in a comma delimited list of residue numbers/names, or with in the range of start and end residue numbers. Possible values: "ResidueNum[,ResidueNum,..]", StartResidueNum,EndResiduNum, or <"ResidueName[,ResidueName,..]". Default: None. Examples:

  20
  5,10
  TYR,SER,THR

  --RecordMode option controls type of record lines to extract from PDBFile(s): ATOM, HETATM or both.

--SequenceLength number

  Maximum sequence length per line in sequence file(s). Default: 80.

--SequenceRecords Atom | SeqRes

  Specify which records to use for extracting residue names from PDBFiles(s) during Sequences value of -m, --mode option: use ATOM records to compile a list of residues in a chain or parse SEQRES record to get a list of residues. Possible values: Atom | SeqRes. Default: Atom.

--SequenceIDPrefix FileName | HeaderRecord | Automatic

  Specify how to generate a prefix for sequence IDs during Sequences value of -m, --mode option: use input file name prefix; retrieve PDB ID from HEADER record; or automatically decide the method for generating the prefix. The chain IDs are also appended to the prefix. Possible values: FileName | HeaderRecord | Automatic. Default: Automatic

--WaterResidueNames Automatic | "ResidueName,[ResidueName,...]"

  Identification of water residues during NonWater value of -m, --mode option. Possible values: Automatic | "ResidueName,[ResidueName,...]". Default: Automatic - corresponds to "HOH,WAT,H20". You can also specify a different comma delimited list of residue names to use for water.

-w, --WorkingDir dirname

  Location of working directory. Default: current directory.

## EXAMPLES

To extract non-water records from Sample2.pdb file and generate Sample2NonWater.pdb file, type:

% ExtractFromPDBFiles.pl Sample2.pdb

To extract non-water records corresponding to only ATOM records from Sample2.pdb file and generate Sample2NonWater.pdb file, type:

% ExtractFromPDBFiles.pl --RecordMode Atom Sample2.pdb

To extract non-water records from Sample2.pdb file using HOH or WAT residue name for water along with all old non-coordinate records and generate Sample2NewNonWater.pdb file, type:

% ExtractFromPDBFiles.pl -m NonWater --WaterResidueNames "HOH,WAT" -KeepOldRecords Yes -r Sample2New -o Sample2.pdb

To extract non-hydrogens records from Sample2.pdb file and generate Sample2NonHydrogen.pdb file, type:

% ExtractFromPDBFiles.pl -m NonHydrogens Sample2.pdb

To extract data for first chain in Sample2.pdb and generate Sample2ChainA.pdb, type file, type:

% ExtractFromPDBFiles.pl -m chains -o Sample2.pdb

To extract data for both chains in Sample2.pdb and generate Sample2ChainA.pdb and Sample2ChainB.pdb, type:

% ExtractFromPDBFiles.pl -m chains -c All -o Sample2.pdb

To extract data for alpha carbons in Sample2.pdb and generate Sample2CAlphas.pdb, type:

% ExtractFromPDBFiles.pl -m CAlphas -o Sample2.pdb

To extract records for specific residue numbers in all chains from Sample2.pdb file and generate Sample2ResidueNums.pdb file, type:

% ExtractFromPDBFiles.pl -m ResidueNums --Residues "3,6" Sample2.pdb

To extract records for a specific range of residue number in all chains from Sample2.pdb file and generate Sample2ResiduesRange.pdb file, type:

% ExtractFromPDBFiles.pl -m ResiduesRange --Residues "10,30" Sample2.pdb

To extract data for all ATOM and HETATM records with in 10 angstrom of an atom specifed by atom serial number and name "1,N" in Sample2.pdb file and generate Sample2DistanceByAtom.pdb, type:

% ExtractFromPDBFiles.pl -m Distance --DistanceMode Atom --DistanceOrigin "1,N" -k No --distance 10 -o Sample2.pdb

To extract data for all ATOM and HETATM records for complete residues with any atom or hetatm less than 10 angstrom of an atom specifed by atom serial number and name "1,N" in Sample2.pdb file and generate Sample2DistanceByAtom.pdb, type:

% ExtractFromPDBFiles.pl -m Distance --DistanceMode Atom --DistanceOrigin "1,N" --DistanceSelectionMode ByResidue -k No --distance 10 -o Sample2.pdb

To extract data for all ATOM and HETATM records with in 25 angstrom of an arbitrary point "0,0,0" in Sample2.pdb file and generate Sample2DistanceByXYZ.pdb, type:

% ExtractFromPDBFiles.pl -m Distance --DistanceMode XYZ --DistanceOrigin "0,0,0" -k No --distance 25 -o Sample2.pdb

## AUTHOR

Manish Sud

## SEE ALSO

InfoPDBFiles.pl, ModifyPDBFiles.pl

## COPYRIGHT

Copyright (C) 2015 Manish Sud. All rights reserved.

This file is part of MayaChemTools.

MayaChemTools is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

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