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The protein structure modules of BioJava.
/*
* BioJava development code
*
* This code may be freely distributed and modified under the
* terms of the GNU Lesser General Public Licence. This should
* be distributed with the code. If you do not have a copy,
* see:
*
* http://www.gnu.org/copyleft/lesser.html
*
* Copyright for this code is held jointly by the individual
* authors. These should be listed in @author doc comments.
*
* For more information on the BioJava project and its aims,
* or to join the biojava-l mailing list, visit the home page
* at:
*
* http://www.biojava.org/
*
* Created on Aug 23, 2007
*
*/
package org.biojava.nbio.structure.io;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.biojava.nbio.alignment.Alignments;
import org.biojava.nbio.alignment.Alignments.PairwiseSequenceAlignerType;
import org.biojava.nbio.alignment.SimpleGapPenalty;
import org.biojava.nbio.alignment.template.GapPenalty;
import org.biojava.nbio.alignment.template.PairwiseSequenceAligner;
import org.biojava.nbio.core.alignment.matrices.SubstitutionMatrixHelper;
import org.biojava.nbio.core.alignment.template.SequencePair;
import org.biojava.nbio.core.alignment.template.SubstitutionMatrix;
import org.biojava.nbio.core.exceptions.CompoundNotFoundException;
import org.biojava.nbio.core.sequence.DNASequence;
import org.biojava.nbio.core.sequence.ProteinSequence;
import org.biojava.nbio.core.sequence.RNASequence;
import org.biojava.nbio.core.sequence.compound.AmbiguityDNACompoundSet;
import org.biojava.nbio.core.sequence.compound.AmbiguityDNARNAHybridCompoundSet;
import org.biojava.nbio.core.sequence.compound.AmbiguityRNACompoundSet;
import org.biojava.nbio.core.sequence.compound.AminoAcidCompound;
import org.biojava.nbio.core.sequence.compound.AminoAcidCompoundSet;
import org.biojava.nbio.core.sequence.compound.DNACompoundSet;
import org.biojava.nbio.core.sequence.compound.NucleotideCompound;
import org.biojava.nbio.core.sequence.template.Compound;
import org.biojava.nbio.core.sequence.template.Sequence;
import org.biojava.nbio.structure.AminoAcid;
import org.biojava.nbio.structure.Atom;
import org.biojava.nbio.structure.Chain;
import org.biojava.nbio.structure.Group;
import org.biojava.nbio.structure.GroupType;
import org.biojava.nbio.structure.HetatomImpl;
import org.biojava.nbio.structure.NucleotideImpl;
import org.biojava.nbio.structure.ResidueNumber;
import org.biojava.nbio.structure.Structure;
import org.biojava.nbio.structure.io.mmcif.chem.PolymerType;
import org.biojava.nbio.structure.io.mmcif.chem.ResidueType;
import org.biojava.nbio.structure.io.mmcif.model.ChemComp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Aligns the SEQRES residues to the ATOM residues.
* The AminoAcids that can be matched between the two of them will be set in the SEQRES
* chains
*
*
* @author Andreas Prlic
* @author Jose Duarte
*/
public class SeqRes2AtomAligner {
private static final Logger logger = LoggerFactory.getLogger(SeqRes2AtomAligner.class);
private String alignmentString;
public SeqRes2AtomAligner(){
logger.debug("initialising SeqRes2AtomAligner");
alignmentString = "";
}
public String getAlignmentString() {
return alignmentString;
}
public static Chain getMatchingAtomRes(Chain seqRes, List atomList)
{
Iterator iter = atomList.iterator();
while(iter.hasNext()){
Chain atomChain = iter.next();
if ( atomChain.getChainID().equals(seqRes.getChainID())){
return atomChain;
}
}
logger.info("Could not match SEQRES chainID >" + seqRes.getChainID() + "< to ATOM chains!, size of atom chain: " + atomList.size());
return null;
}
public void align(Structure s, List seqResList){
List atomList = s.getModel(0);
for (Chain seqRes: seqResList){
Chain atomRes = getMatchingAtomRes(seqRes,atomList);
if ( atomRes == null)
continue;
mapSeqresRecords(atomRes,seqRes);
}
}
/**
* Map the seqRes groups to the atomRes chain.
* Updates the atomRes chain object with the mapped data
* The seqRes chain should not be needed after this and atomRes should be further used.
*
* @param atomRes the chain containing ATOM groups (in atomGroups slot). This chain
* is modified to contain in its seqresGroups slot the mapped atom groups
* @param seqRes the chain containing SEQRES groups (in atomGroups slot). This chain
* is not modified
*/
public void mapSeqresRecords(Chain atomRes, Chain seqRes) {
List seqResGroups = seqRes.getAtomGroups();
List atmResGroups = atomRes.getAtomGroups();
logger.debug("Comparing ATOM {} ({} groups) to SEQRES {} ({} groups) ",
atomRes.getChainID(), atmResGroups.size(), seqRes.getChainID(), seqResGroups.size());
List matchedGroups = trySimpleMatch(seqResGroups, atmResGroups);
if ( matchedGroups != null) {
// update the new SEQRES list
atomRes.setSeqResGroups(matchedGroups);
return;
}
logger.debug("Could not map SEQRES to ATOM records easily, need to align...");
int numAminosSeqres = seqRes.getAtomGroups(GroupType.AMINOACID).size();
int numNucleotidesSeqres = seqRes.getAtomGroups(GroupType.NUCLEOTIDE).size();
if ( numAminosSeqres < 1) {
if ( numNucleotidesSeqres > 1) {
logger.debug("SEQRES chain {} is a nucleotide chain ({} nucleotides), aligning nucleotides...", seqRes.getChainID(), numNucleotidesSeqres);
alignNucleotideChains(seqRes,atomRes);
return;
} else {
logger.debug("SEQRES chain {} contains {} amino acids and {} nucleotides, ignoring...", seqRes.getChainID(),numAminosSeqres,numNucleotidesSeqres);
return;
}
}
if ( atomRes.getAtomGroups(GroupType.AMINOACID).size() < 1) {
logger.debug("ATOM chain {} does not contain amino acids, ignoring...", atomRes.getChainID());
return;
}
logger.debug("Proceeding to do protein alignment for chain {}", atomRes.getChainID() );
boolean noMatchFound = alignProteinChains(seqResGroups,atomRes.getAtomGroups());
if ( ! noMatchFound){
atomRes.setSeqResGroups(seqResGroups);
}
}
private void alignNucleotideChains(Chain seqRes, Chain atomRes) {
if ( atomRes.getAtomGroups(GroupType.NUCLEOTIDE).size() < 1) {
logger.debug("ATOM chain {} does not contain nucleotides, ignoring...", atomRes.getChainID());
return;
}
logger.debug("Alignment for chain {}", atomRes.getChainID() );
List seqResGroups = seqRes.getAtomGroups();
boolean noMatchFound = alignNucleotideGroups(seqResGroups,atomRes.getAtomGroups());
if ( ! noMatchFound){
atomRes.setSeqResGroups(seqResGroups);
}
}
/**
* A simple matching approach that tries to do a 1:1 mapping between SEQRES and ATOM records
*
* @param seqRes
* @param atomList
* @return the matching or null if the matching didn't work
*/
private List trySimpleMatch(List seqResGroups,List atmResGroups) {
// by default first ATOM position is 1
//
@SuppressWarnings("unchecked")
List newSeqResGroups = (ArrayList)((ArrayList)seqResGroups).clone();
boolean startAt1 = true;
for ( int atomResPos = 0 ; atomResPos < atmResGroups.size() ; atomResPos++){
// let's try to match this case
Group atomResGroup = atmResGroups.get(atomResPos);
// let's ignore waters
if ( atomResGroup.isWater()){
continue;
}
ResidueNumber atomResNum = atomResGroup.getResidueNumber();
int seqResPos = atomResNum.getSeqNum();
if ( seqResPos < 0) {
logger.debug("ATOM residue number < 0 : {}", seqResPos);
return null;
}
if ( seqResPos == 0){
// make sure the first SEQRES is matching.
Group seqResGroup = seqResGroups.get(0);
if ( seqResGroup.getPDBName().equals(atomResGroup.getPDBName())){
// they match! seems in this case the numbering starts with 0...
startAt1 = false;
} else {
logger.debug("SEQRES position 1 ({}) does not match ATOM PDB res num 0 ({})",
seqResGroup.getPDBName(), atomResGroup.getPDBName());
return null;
}
}
if ( startAt1 )
seqResPos--;
// another check that would require the alignment approach
if ( startAt1 && seqResPos >= seqResGroups.size() )
{
// could be a HETATOM...
if ( atomResGroup instanceof AminoAcid) {
logger.debug(" ATOM residue nr: " + seqResPos + " > seqres! " + seqResGroups.size() + " " + atomResGroup);
return null;
} else if ( atomResGroup instanceof NucleotideImpl) {
logger.debug(" NUCLEOTIDE residue nr: " + seqResPos + " > seqres! " + seqResGroups.size() + " " + atomResGroup);
return null;
} else {
// we won't map HETATOM groups...
continue;
}
}
// if ( seqResPos < 0){
//
// System.err.println("What is going on??? " + atomRes.getChainID() + " " + atomResGroup);
// }
if ( seqResPos >= seqResGroups.size()){
logger.debug("seqres groups don't match atom indices " + seqResPos);
if ( atomResGroup instanceof AminoAcid )
return null;
else
continue;
}
Group seqResGroup = seqResGroups.get(seqResPos );
if ( ! seqResGroup.getPDBName().trim().equals(atomResGroup.getPDBName().trim())){
// a mismatch! something is wrong in the mapping and we need to do an alignment
logger.debug("Mismatch of SEQRES pos " + seqResPos + " and ATOM record: " + atomResGroup + " | " + seqResGroup);
return null;
}
// the two groups are identical and we can merge them
// replace the SEQRES group with the ATOM group...
Group replacedGroup = newSeqResGroups.set(seqResPos, atomResGroup);
logger.debug("Merging index {}: replaced seqres group {} ({}) with atom group {} ({})",
seqResPos,
replacedGroup.getResidueNumber(), replacedGroup.getPDBName(),
atomResGroup.getResidueNumber(), atomResGroup.getPDBName());
}
// all went ok. copy over the updated list to the original one.
// note: if something went wrong, we did not modifiy the original list.
//seqResGroups = newSeqResGroups;
// int pos = -1;
// for (Group g: seqResGroups){
// pos++;
// logger.debug(pos + " " + g);
// }
//System.out.println("I:" + seqResGroups);
// all atom records could get matched correctly!
return newSeqResGroups;
}
/**
* Returns the full sequence of the Atom records of a parent
* with X instead of HETATMSs. The advantage of this is
* that it allows us to also align HETATM groups back to the SEQRES.
* @param groups the list of groups in a parent
* @param positionIndex a Map to keep track of which group is at which sequence position
* @param isNucleotideChain whether the atom groups are predominantly nucleotides (the groups represent a nucleotide chain), if true
* non-standard nucleotides will be represented with ambiguous letter 'N' instead of 'X', if false all non-standard residues will be 'X'
* @return string representations
*/
public static String getFullAtomSequence(List groups, Map positionIndex, boolean isNucleotideChain){
StringBuffer sequence = new StringBuffer() ;
int seqIndex = 0; // track sequence.length()
for ( int i=0 ; i< groups.size(); i++){
Group g = groups.get(i);
if ( g instanceof AminoAcid ){
AminoAcid a = (AminoAcid)g;
char oneLetter =a.getAminoType();
if ( oneLetter == '?')
oneLetter = 'X';
positionIndex.put(seqIndex,i);
sequence.append(oneLetter );
seqIndex++;
} else {
// exclude solvents
if ( g.isWater())
continue;
// exclude metals
if ( g.size() == 1 ) {
Atom a = g.getAtom(0);
if ( a == null)
continue;
if (a.getElement().isMetal())
continue;
}
ChemComp cc = g.getChemComp();
if ( cc == null) {
logger.debug("No chem comp available for group {}",g.toString());
// not sure what to do in that case!
continue;
}
if (
ResidueType.lPeptideLinking.equals(cc.getResidueType()) ||
PolymerType.PROTEIN_ONLY.contains(cc.getPolymerType()) ||
PolymerType.POLYNUCLEOTIDE_ONLY.contains(cc.getPolymerType())
) {
//System.out.println(cc.getOne_letter_code());
String c = cc.getOne_letter_code();
if ( c.equals("?")) {
if (isNucleotideChain && PolymerType.POLYNUCLEOTIDE_ONLY.contains(cc.getPolymerType())) {
// the way to represent unknown nucleotides is with 'N', see https://en.wikipedia.org/wiki/Nucleic_acid_notation
c = "N";
} else {
c = "X";
}
}
// For some unusual cases the het residue can map to 2 or more standard aas and thus give an
// insertion of length >1.
// e.g. 1: SUI maps to DG (in 1oew,A)
// e.g. 2: NRQ maps to MYG (in 3cfh,A)
if (c.length()>1) {
logger.info("Group '{}' maps to more than 1 standard aminoacid: {}.",
g.toString(), c);
}
// because of the mapping to more than 1 aminoacid, we have
// to loop through it (99% of cases c will have length 1 anyway)
for (int cIdx=0;cIdx seqRes, List atomRes) {
Map seqresIndexPosition = new HashMap();
Map atomIndexPosition = new HashMap();
String seq1 = getFullAtomSequence(seqRes, seqresIndexPosition, true);
//
String seq2 = getFullAtomSequence(atomRes, atomIndexPosition, true);
if (seq1.isEmpty() || seq2.isEmpty()) {
logger.warn("Could not align nucleotide sequences, at least one of them is empty");
return true;
}
logger.debug("align seq1 ("+ seq1.length()+") " + seq1);
logger.debug("align seq2 ("+ seq2.length()+") " + seq2);
Sequence s1 = getNucleotideSequence(seq1);
Sequence s2 = getNucleotideSequence(seq2);
if (s1==null || s2==null) return true;
if ( ! s1.getCompoundSet().equals(s2.getCompoundSet()) ) {
// e.g. trying to align a DNA and an RNA sequence...
// test PDB ID: 1A34
// try to make both RNA sequence...
if ( ! s1.getCompoundSet().equals(AmbiguityRNACompoundSet.getRNACompoundSet())) {
try {
s1 = new RNASequence(seq1,AmbiguityRNACompoundSet.getRNACompoundSet());
} catch (CompoundNotFoundException ex) {
logger.warn("Could not align DNA and RNA compound sets: " + seq1);
return true;
}
}
if( ! s2.getCompoundSet().equals(AmbiguityRNACompoundSet.getRNACompoundSet())) {
try {
s2 = new RNASequence(seq2,AmbiguityRNACompoundSet.getRNACompoundSet());
} catch (CompoundNotFoundException ex) {
logger.warn("Could not align DNA and RNA compound sets: " + seq2);
return true;
}
}
}
SubstitutionMatrix matrix = SubstitutionMatrixHelper.getNuc4_4();
GapPenalty penalty = new SimpleGapPenalty(8,1);
PairwiseSequenceAligner, NucleotideCompound> smithWaterman =
Alignments.getPairwiseAligner(s1, s2, PairwiseSequenceAlignerType.LOCAL, penalty, matrix);
SequencePair, NucleotideCompound> pair = smithWaterman.getPair();
if ( pair == null) {
logger.warn("Could not align nucleotide sequences. ATOM and SEQRES groups will not be aligned.");
logger.warn("Sequences: ");
logger.warn(seq1);
logger.warn(seq2);
return true;
}
logger.debug("Alignment:\n"+pair.toString(100));
boolean noMatchFound = mapDNAChains(seqRes,atomRes,pair,seqresIndexPosition, atomIndexPosition );
return noMatchFound;
}
private Sequence getNucleotideSequence(String seq) {
Sequence s = null;
// first we try DNA, then RNA, them hybrid
try {
s = new DNASequence(seq, AmbiguityDNACompoundSet.getDNACompoundSet());
} catch (CompoundNotFoundException e){
try {
s= new RNASequence(seq, AmbiguityRNACompoundSet.getRNACompoundSet());
} catch (CompoundNotFoundException ex) {
try {
// it could still be a hybrid, e.g. 3hoz, chain T, what to do in that case?
s = new DNASequence(seq, AmbiguityDNARNAHybridCompoundSet.getDNARNAHybridCompoundSet());
logger.warn("Hybrid RNA/DNA sequence detected for sequence {}", seq);
} catch (CompoundNotFoundException exc) {
// not DNA, nor RNA, nor hybrid
logger.warn("Could not determine compound set (neither DNA, RNA nor hybrid) for nucleotide sequence " + seq);
return null;
}
}
}
return s;
}
/**
* Aligns two chains of groups, where the first parent is representing the
* list of amino acids as obtained from the SEQRES records, and the second parent
* represents the groups obtained from the ATOM records (and containing the actual ATOM information).
* This does the actual alignment and if a group can be mapped to a position in the SEQRES then the corresponding
* position is replaced with the group that contains the atoms.
*
* @param seqRes
* @param atomRes
* @return true if no match has been found
*/
private boolean alignProteinChains(List seqRes, List atomRes) {
Map seqresIndexPosition = new HashMap();
Map atomIndexPosition = new HashMap();
String seq1 = getFullAtomSequence(seqRes, seqresIndexPosition, false);
//
String seq2 = getFullAtomSequence(atomRes, atomIndexPosition, false);
logger.debug("Protein seq1 to align (length "+ seq1.length()+"): " + seq1);
logger.debug("Protein seq2 to align (length "+ seq2.length()+"): " + seq2);
ProteinSequence s1;
ProteinSequence s2;
try {
s1 = new ProteinSequence(seq1);
s2 = new ProteinSequence(seq2);
} catch (CompoundNotFoundException e) {
logger.warn("Could not create protein sequences ({}) to align ATOM and SEQRES groups, they will remain unaligned.", e.getMessage());
return true;
}
SubstitutionMatrix matrix = SubstitutionMatrixHelper.getBlosum65();
GapPenalty penalty = new SimpleGapPenalty(8, 1);
PairwiseSequenceAligner smithWaterman =
Alignments.getPairwiseAligner(s1, s2, PairwiseSequenceAlignerType.LOCAL, penalty, matrix);
SequencePair pair = smithWaterman.getPair();
// sequences that are only X (e.g. 1jnv chain A) produced empty alignments, because nothing aligns to nothing and thus the local alignment is empty
// to avoid those empty alignments we catch them here with pair.getLength()==0
if ( pair == null || pair.getLength()==0) {
logger.warn("Could not align protein sequences. ATOM and SEQRES groups will not be aligned.");
logger.warn("Sequences: ");
logger.warn(seq1);
logger.warn(seq2);
return true;
}
logger.debug("Alignment:\n"+pair.toString(100));
boolean noMatchFound = mapChains(seqRes,atomRes,pair,seqresIndexPosition, atomIndexPosition );
return noMatchFound;
}
private boolean mapChains(List seqResGroups, List atomRes,
SequencePair pair,
Map seqresIndexPosition,
Map atomIndexPosition ) {
// at the present stage the future seqRes are still stored as Atom groups in the seqRes parent...
int aligLength = pair.getLength();
// make sure we actually find an alignment
boolean noMatchFound = true;
Compound gapSymbol = AminoAcidCompoundSet.getAminoAcidCompoundSet().getCompoundForString("-");
mainLoop:
for (int i = 1; i <= aligLength ; i++) {
Compound s = pair.getCompoundAt(1, i);
Compound a = pair.getCompoundAt(2, i);
// alignment is using internal index start at 1...
int posSeq = pair.getIndexInQueryAt(i) - 1;
int posAtom = pair.getIndexInTargetAt(i) - 1;
if ( s.equals(gapSymbol) || a.equals(gapSymbol)){
continue;
}
if ( s.equals(a)){
// the atom record can be aligned to the SeqRes record!
// replace the SeqRes group with the Atom group!
Group s1 = seqResGroups.get(seqresIndexPosition.get(posSeq));
Group a1 = atomRes.get(atomIndexPosition.get(posAtom));
if ( s1 == null || a1 == null){
/// can't map this position...
logger.warn("can't map " + i + ":" + s + " " + posSeq +" " + s1 + " atom: " + posAtom + " " + a1 );
continue mainLoop;
}
// need to trim the names to allow matching e.g in
// pdb1b2m
String pdbNameS = s1.getPDBName();
String pdbNameA = a1.getPDBName();
if ( pdbNameS == null || pdbNameA == null ){
logger.warn("null value for group.getPDBName found at {} when trying to align {} and {} {}",posSeq, s1, a1, posAtom);
logger.warn("ATOM and SEQRES sequences will not be aligned.");
return true;
}
if ( ! pdbNameA.trim().equals(pdbNameS.trim())) {
String msg = "'"+ s1 + "' (position " + posSeq + ") does not align with '" + a1+ "' (position " + posAtom + "), should be: " + s + " : " + a;
if ( s1.getType().equals(HetatomImpl.type) && a1.getType().equals(HetatomImpl.type)){
logger.info(msg + ". They seem to be hetatoms, so ignoring mismatch.");
}
else {
logger.warn(msg + ". This could be a problem because they aren't both hetatoms");
}
}
// do the actual replacing of the SEQRES group with the ATOM group
// if ( s1.getChain().getChainID().equals("A")) {
// System.out.println(" setting " + posSeq +" " + a1);
// }
seqResGroups.set(seqresIndexPosition.get(posSeq),a1);
noMatchFound = false;
}
}
// now we merge the two chains into one
// the Groups that can be aligned are now pointing to the
// groups in the Atom records.
if ( noMatchFound) {
logger.debug("no alignment found!");
}
return noMatchFound;
}
private boolean mapDNAChains(List seqResGroups, List atomRes,
SequencePair, NucleotideCompound> pair,
Map seqresIndexPosition,
Map atomIndexPosition) {
// at the present stage the future seqREs are still stored as Atom groups in the seqRes parent...
int aligLength = pair.getLength();
// System.out.println("sequence length seqres:");
// System.out.println(seqresIndexPosition.keySet().size());
// System.out.println("alignment length: " + aligLength);
// System.out.println(gapSymbol.getName());
// make sure we actually find an alignment
boolean noMatchFound = true;
Compound gapSymbol = DNACompoundSet.getDNACompoundSet().getCompoundForString("-");
mainLoop:
for (int i = 1; i <= aligLength ; i++) {
Compound s = pair.getCompoundAt(1, i);
Compound a = pair.getCompoundAt(2,i);
// alignment is using internal index start at 1...
int posSeq = pair.getIndexInQueryAt(i) -1;
int posAtom = pair.getIndexInTargetAt(i) -1;
if ( s.equals(gapSymbol) || a.equals(gapSymbol)){
continue;
}
if ( s.equals(a)){
// the atom record can be aligned to the SeqRes record!
// replace the SeqRes group with the Atom group!
Group s1 = seqResGroups.get(seqresIndexPosition.get(posSeq));
Group a1 = atomRes.get(atomIndexPosition.get(posAtom));
if ( s1 == null || a1 == null){
/// can't map this position...
logger.warn("can't map " + i + ":" + s + " " + posSeq +" " + s1 + " atom: " + posAtom + " " + a1 );
continue mainLoop;
}
// need to trim the names to allow matching e.g in
// pdb1b2m
String pdbNameS = s1.getPDBName();
String pdbNameA = a1.getPDBName();
if ( pdbNameS == null || pdbNameA == null ){
logger.warn("null value found for group.getPDBName() at " + posSeq + " when trying to align " + s1 + " and " + a1 + " " + posAtom);
logger.warn("ATOM and SEQRES sequences will not be aligned.");
}
if (! pdbNameA.equals(pdbNameS)){
if ( ! pdbNameA.trim().equals(pdbNameS.trim())) {
logger.info(s1 + " " + posSeq + " does not align with " + a1+ " " + posAtom + " should be: " + s + " : " + a);
if ( s1.getType().equals(HetatomImpl.type) && a1.getType().equals(HetatomImpl.type)){
logger.info("they seem to be hetatoms, so ignoring mismatch.");
}
else {
// System.exit(0);// for debug only
//System.out.println(lst1.seqString());
//System.out.println(lst2.seqString());
logger.warn("Could not match residues " + s1 + " " + a1);
}
}
}
// do the actual replacing of the SEQRES group with the ATOM group
// if ( s1.getChain().getChainID().equals("A")) {
// System.out.println(" setting " + posSeq +" " + a1);
// }
seqResGroups.set(seqresIndexPosition.get(posSeq),a1);
noMatchFound = false;
}
}
// now we merge the two chains into one
// the Groups that can be aligned are now pointing to the
// groups in the Atom records.
if ( noMatchFound) {
logger.debug("no alignment found!");
}
return noMatchFound;
}
/**
* Storing unaligned SEQRES groups in a Structure.
* @param structure
* @param seqResChains
*/
public static void storeUnAlignedSeqRes(Structure structure, List seqResChains, boolean headerOnly) {
for (int i = 0; i < structure.nrModels(); i++) {
List atomChains = structure.getModel(i);
for (Chain seqRes: seqResChains){
Chain atomRes;
if (headerOnly) {
// In header-only mode skip ATOM records.
// Here we store chains with SEQRES instead of AtomGroups.
seqRes.setSeqResGroups(seqRes.getAtomGroups());
seqRes.setAtomGroups(new ArrayList()); // clear out the atom groups.
atomChains.add(seqRes);
} else {
// Otherwise, we find a chain with AtomGroups
// and set this as SEQRES groups.
atomRes = SeqRes2AtomAligner.getMatchingAtomRes(seqRes,atomChains);
if ( atomRes != null)
atomRes.setSeqResGroups(seqRes.getAtomGroups());
else
logger.warn("Could not find atom records for chain " + seqRes.getChainID());
}
}
if (headerOnly) {
structure.setChains(i, atomChains);
}
}
}
}
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