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1864 lines (1634 loc) · 52.6 KB
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/*
* 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 Jan 4, 2006
*
*/
package org.biojava.nbio.structure;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.vecmath.Matrix4d;
import javax.vecmath.Point3d;
import org.biojava.nbio.structure.align.util.AtomCache;
import org.biojava.nbio.structure.contact.AtomContactSet;
import org.biojava.nbio.structure.contact.Grid;
import org.biojava.nbio.structure.io.FileParsingParameters;
import org.biojava.nbio.structure.io.PDBFileParser;
import org.biojava.nbio.structure.io.mmcif.model.ChemComp;
import org.biojava.nbio.structure.io.util.FileDownloadUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A class that provides some tool methods.
*
* @author Andreas Prlic, Jules Jacobsen
* @since 1.0
*/
public class StructureTools {
private static final Logger logger = LoggerFactory
.getLogger(StructureTools.class);
// Amino Acid backbone
/**
* The atom name of the backbone C-alpha atom. Note that this can be
* ambiguous depending on the context since Calcium atoms use the same name
* in PDB.
*/
public static final String CA_ATOM_NAME = "CA";
/**
* The atom name for the backbone amide nitrogen
*/
public static final String N_ATOM_NAME = "N";
/**
* The atom name for the backbone carbonyl
*/
public static final String C_ATOM_NAME = "C";
/**
* The atom name for the backbone carbonyl oxygen
*/
public static final String O_ATOM_NAME = "O";
/**
* The atom name of the side-chain C-beta atom
*/
public static final String CB_ATOM_NAME = "CB";
// Nucleotide backbone
/**
* The atom name of the backbone C1' in RNA
*/
public static final String C1_ATOM_NAME = "C1'";
/**
* The atom name of the backbone C2' in RNA
*/
public static final String C2_ATOM_NAME = "C2'";
/**
* The atom name of the backbone C3' in RNA
*/
public static final String C3_ATOM_NAME = "C3'";
/**
* The atom name of the backbone C4' in RNA
*/
public static final String C4_ATOM_NAME = "C4'";
/**
* The atom name of the backbone O2' in RNA
*/
public static final String O2_ATOM_NAME = "O2'";
/**
* The atom name of the backbone O3' in RNA
*/
public static final String O3_ATOM_NAME = "O3'";
/**
* The atom name of the backbone O4' in RNA
*/
public static final String O4_ATOM_NAME = "O4'";
/**
* The atom name of the backbone O4' in RNA
*/
public static final String O5_ATOM_NAME = "O5'";
/**
* The atom name of the backbone O4' in RNA
*/
public static final String OP1_ATOM_NAME = "OP1";
/**
* The atom name of the backbone O4' in RNA
*/
public static final String OP2_ATOM_NAME = "OP2";
/**
* The atom name of the backbone phosphate in RNA
*/
public static final String P_ATOM_NAME = "P";
/**
* The atom used as representative for nucleotides, equivalent to
* {@link #CA_ATOM_NAME} for proteins
*/
public static final String NUCLEOTIDE_REPRESENTATIVE = P_ATOM_NAME;
/**
* The character to use for unknown compounds in sequence strings
*/
public static final char UNKNOWN_GROUP_LABEL = 'X';
/**
* Below this ratio of aminoacid/nucleotide residues to the sequence total,
* we use simple majority of aminoacid/nucleotide residues to decide the
* character of the chain (protein/nucleotide)
*/
public static final double RATIO_RESIDUES_TO_TOTAL = 0.95;
// there is a file format change in PDB 3.0 and nucleotides are being
// renamed
private static final Map<String, Character> nucleotides30;
private static final Map<String, Character> nucleotides23;
// amino acid 3 and 1 letter code definitions
private static final Map<String, Character> aminoAcids;
private static final Set<Element> hBondDonorAcceptors;
static {
nucleotides30 = new HashMap<String, Character>();
nucleotides30.put("DA", 'A');
nucleotides30.put("DC", 'C');
nucleotides30.put("DG", 'G');
nucleotides30.put("DT", 'T');
nucleotides30.put("DI", 'I');
nucleotides30.put("A", 'A');
nucleotides30.put("G", 'G');
nucleotides30.put("C", 'C');
nucleotides30.put("U", 'U');
nucleotides30.put("I", 'I');
// the DNA linkers - the +C , +G, +A +T +U and +I have been replaced
// with these:
nucleotides30.put("TAF", UNKNOWN_GROUP_LABEL); // Fluorinated Thymine
nucleotides30.put("TC1", UNKNOWN_GROUP_LABEL); // Furanosyl
nucleotides30.put("TFE", UNKNOWN_GROUP_LABEL); // Fluorinated Thymine
nucleotides30.put("TFO", UNKNOWN_GROUP_LABEL); // Tenofovir (3'
// terminator)
nucleotides30.put("TGP", UNKNOWN_GROUP_LABEL); // Guanine variant
nucleotides30.put("THX", UNKNOWN_GROUP_LABEL); // 5' terminator
nucleotides30.put("TLC", UNKNOWN_GROUP_LABEL); // Thymine with dicyclic
// sugar
nucleotides30.put("TLN", UNKNOWN_GROUP_LABEL); // locked Thymine
nucleotides30.put("LCG", UNKNOWN_GROUP_LABEL); // locked Guanine
nucleotides30.put("TP1", UNKNOWN_GROUP_LABEL); // Thymine peptide
// nucleic acid, with
// added methyl
nucleotides30.put("CP1", UNKNOWN_GROUP_LABEL); // Cytidine peptide
// nucleic acid, with
// added methyl
nucleotides30.put("TPN", UNKNOWN_GROUP_LABEL); // Thymine peptide
// nucleic acid
nucleotides30.put("CPN", UNKNOWN_GROUP_LABEL); // Cytidine peptide
// nucleic acid
nucleotides30.put("GPN", UNKNOWN_GROUP_LABEL); // Guanine peptide
// nucleic acid
nucleotides30.put("APN", UNKNOWN_GROUP_LABEL); // Adenosine peptide
// nucleic acid
nucleotides30.put("TPC", UNKNOWN_GROUP_LABEL); // Thymine variant
// store nucleic acids (C, G, A, T, U, and I), and
// the modified versions of nucleic acids (+C, +G, +A, +T, +U, and +I),
// and
nucleotides23 = new HashMap<String, Character>();
String[] names = { "C", "G", "A", "T", "U", "I", "+C", "+G", "+A",
"+T", "+U", "+I" };
for (String n : names) {
nucleotides23.put(n, n.charAt(n.length() - 1));
}
aminoAcids = new HashMap<String, Character>();
aminoAcids.put("GLY", 'G');
aminoAcids.put("ALA", 'A');
aminoAcids.put("VAL", 'V');
aminoAcids.put("LEU", 'L');
aminoAcids.put("ILE", 'I');
aminoAcids.put("PHE", 'F');
aminoAcids.put("TYR", 'Y');
aminoAcids.put("TRP", 'W');
aminoAcids.put("PRO", 'P');
aminoAcids.put("HIS", 'H');
aminoAcids.put("LYS", 'K');
aminoAcids.put("ARG", 'R');
aminoAcids.put("SER", 'S');
aminoAcids.put("THR", 'T');
aminoAcids.put("GLU", 'E');
aminoAcids.put("GLN", 'Q');
aminoAcids.put("ASP", 'D');
aminoAcids.put("ASN", 'N');
aminoAcids.put("CYS", 'C');
aminoAcids.put("MET", 'M');
// MSE is only found as a molecular replacement for MET
aminoAcids.put("MSE", 'M');
// 'non-standard', genetically encoded
// http://www.chem.qmul.ac.uk/iubmb/newsletter/1999/item3.html
// IUBMB recommended name is 'SEC' but the wwPDB currently use 'CSE'
// likewise 'PYL' (IUBMB) and 'PYH' (PDB)
aminoAcids.put("CSE", 'U');
aminoAcids.put("SEC", 'U');
aminoAcids.put("PYH", 'O');
aminoAcids.put("PYL", 'O');
hBondDonorAcceptors = new HashSet<Element>();
hBondDonorAcceptors.add(Element.N);
hBondDonorAcceptors.add(Element.O);
hBondDonorAcceptors.add(Element.S);
}
/**
* Count how many Atoms are contained within a Structure object.
*
* @param s
* the structure object
* @return the number of Atoms in this Structure
*/
public static final int getNrAtoms(Structure s) {
int nrAtoms = 0;
Iterator<Group> iter = new GroupIterator(s);
while (iter.hasNext()) {
Group g = iter.next();
nrAtoms += g.size();
}
return nrAtoms;
}
/**
* Count how many groups are contained within a structure object.
*
* @param s
* the structure object
* @return the number of groups in the structure
*/
public static final int getNrGroups(Structure s) {
int nrGroups = 0;
List<Chain> chains = s.getChains(0);
for (Chain c : chains) {
nrGroups += c.getAtomLength();
}
return nrGroups;
}
/**
* Returns an array of the requested Atoms from the Structure object.
* Iterates over all groups and checks if the requested atoms are in this
* group, no matter if this is a {@link AminoAcid} or {@link HetatomImpl}
* group. If the group does not contain all requested atoms then no atoms
* are added for that group. For structures with more than one model, only
* model 0 will be used.
*
* @param s
* the structure to get the atoms from
*
* @param atomNames
* contains the atom names to be used.
* @return an Atom[] array
*/
public static final Atom[] getAtomArray(Structure s, String[] atomNames) {
List<Chain> chains = s.getModel(0);
List<Atom> atoms = new ArrayList<Atom>();
extractAtoms(atomNames, chains, atoms);
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Returns an array of the requested Atoms from the Structure object. In
* contrast to {@link #getAtomArray(Structure, String[])} this method
* iterates over all chains. Iterates over all chains and groups and checks
* if the requested atoms are in this group, no matter if this is a
* {@link AminoAcid} or {@link HetatomImpl} group. If the group does not
* contain all requested atoms then no atoms are added for that group. For
* structures with more than one model, only model 0 will be used.
*
* @param s
* the structure to get the atoms from
*
* @param atomNames
* contains the atom names to be used.
* @return an Atom[] array
*/
public static final Atom[] getAtomArrayAllModels(Structure s,
String[] atomNames) {
List<Atom> atoms = new ArrayList<Atom>();
for (int i = 0; i < s.nrModels(); i++) {
List<Chain> chains = s.getModel(i);
extractAtoms(atomNames, chains, atoms);
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Convert all atoms of the structure (first model) into an Atom array
*
* @param s
* input structure
* @return all atom array
*/
public static final Atom[] getAllAtomArray(Structure s) {
List<Atom> atoms = new ArrayList<Atom>();
AtomIterator iter = new AtomIterator(s);
while (iter.hasNext()) {
Atom a = iter.next();
atoms.add(a);
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Returns and array of all atoms of the chain (first model), including
* Hydrogens (if present) and all HETATOMs. Waters are not included.
*
* @param c
* input chain
* @return all atom array
*/
public static final Atom[] getAllAtomArray(Chain c) {
List<Atom> atoms = new ArrayList<Atom>();
for (Group g : c.getAtomGroups()) {
if (g.isWater())
continue;
for (Atom a : g.getAtoms()) {
atoms.add(a);
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* List of groups from the structure not included in ca (e.g. ligands).
*
* Unaligned groups are searched from all chains referenced in ca, as well
* as any chains in the first model of the structure from ca[0], if any.
*
* @param ca an array of atoms
* @return
*/
public static List<Group> getUnalignedGroups(Atom[] ca) {
Set<Chain> chains = new HashSet<Chain>();
Set<Group> caGroups = new HashSet<Group>();
// Create list of all chains in this structure
Structure s = null;
if (ca.length > 0) {
Group g = ca[0].getGroup();
if (g != null) {
Chain c = g.getChain();
if (c != null) {
s = c.getStructure();
}
}
}
if (s != null) {
// Add all chains from the structure
for (Chain c : s.getChains(0)) {
chains.add(c);
}
}
// Add groups and chains from ca
for (Atom a : ca) {
Group g = a.getGroup();
if (g != null) {
caGroups.add(g);
Chain c = g.getChain();
if (c != null) {
chains.add(c);
}
}
}
// Iterate through all chains, finding groups not in ca
List<Group> unadded = new ArrayList<Group>();
for (Chain c : chains) {
for (Group g : c.getAtomGroups()) {
if (!caGroups.contains(g)) {
unadded.add(g);
}
}
}
return unadded;
}
/**
* Returns and array of all non-Hydrogen atoms in the given Structure,
* optionally including HET atoms or not. Waters are not included.
*
* @param s
* @param hetAtoms
* if true HET atoms are included in array, if false they are not
* @return
*/
public static final Atom[] getAllNonHAtomArray(Structure s, boolean hetAtoms) {
List<Atom> atoms = new ArrayList<Atom>();
AtomIterator iter = new AtomIterator(s);
while (iter.hasNext()) {
Atom a = iter.next();
if (a.getElement() == Element.H)
continue;
Group g = a.getGroup();
if (g.isWater())
continue;
if (!hetAtoms && g.getType().equals(GroupType.HETATM))
continue;
atoms.add(a);
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Returns and array of all non-Hydrogen atoms in the given Chain,
* optionally including HET atoms or not Waters are not included.
*
* @param c
* @param hetAtoms
* if true HET atoms are included in array, if false they are not
* @return
*/
public static final Atom[] getAllNonHAtomArray(Chain c, boolean hetAtoms) {
List<Atom> atoms = new ArrayList<Atom>();
for (Group g : c.getAtomGroups()) {
if (g.isWater())
continue;
for (Atom a : g.getAtoms()) {
if (a.getElement() == Element.H)
continue;
if (!hetAtoms && g.getType().equals(GroupType.HETATM))
continue;
atoms.add(a);
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Returns and array of all non-Hydrogen atoms coordinates in the given Chain,
* optionally including HET atoms or not Waters are not included.
*
* @param c
* @param hetAtoms
* if true HET atoms are included in array, if false they are not
* @return
*/
public static final Point3d[] getAllNonHCoordsArray(Chain c, boolean hetAtoms) {
List<Point3d> atoms = new ArrayList<Point3d>();
for (Group g : c.getAtomGroups()) {
if (g.isWater())
continue;
for (Atom a : g.getAtoms()) {
if (a.getElement() == Element.H)
continue;
if (!hetAtoms && g.getType().equals(GroupType.HETATM))
continue;
atoms.add(a.getCoordsAsPoint3d());
}
}
return atoms.toArray(new Point3d[atoms.size()]);
}
/**
* Adds to the given atoms list, all atoms of groups that contained all
* requested atomNames, i.e. if a group does not contain all of the
* requested atom names, its atoms won't be added.
*
* @param atomNames
* @param chains
* @param atoms
*/
private static void extractAtoms(String[] atomNames, List<Chain> chains,
List<Atom> atoms) {
for (Chain c : chains) {
for (Group g : c.getAtomGroups()) {
// a temp container for the atoms of this group
List<Atom> thisGroupAtoms = new ArrayList<Atom>();
// flag to check if this group contains all the requested atoms.
boolean thisGroupAllAtoms = true;
for (String atomName : atomNames) {
Atom a = g.getAtom(atomName);
if (a == null) {
// this group does not have a required atom, skip it...
thisGroupAllAtoms = false;
break;
}
thisGroupAtoms.add(a);
}
if (thisGroupAllAtoms) {
// add the atoms of this group to the array.
for (Atom a : thisGroupAtoms) {
atoms.add(a);
}
}
}
}
}
/**
* Returns an array of the requested Atoms from the Chain object. Iterates
* over all groups and checks if the requested atoms are in this group, no
* matter if this is a AminoAcid or Hetatom group. If the group does not
* contain all requested atoms then no atoms are added for that group.
*
* @param c
* the Chain to get the atoms from
*
* @param atomNames
* contains the atom names to be used.
* @return an Atom[] array
*/
public static final Atom[] getAtomArray(Chain c, String[] atomNames) {
List<Atom> atoms = new ArrayList<Atom>();
for (Group g : c.getAtomGroups()) {
// a temp container for the atoms of this group
List<Atom> thisGroupAtoms = new ArrayList<Atom>();
// flag to check if this group contains all the requested atoms.
boolean thisGroupAllAtoms = true;
for (String atomName : atomNames) {
Atom a = g.getAtom(atomName);
if (a == null) {
logger.debug("Group " + g.getResidueNumber() + " ("
+ g.getPDBName()
+ ") does not have the required atom '" + atomName
+ "'");
// this group does not have a required atom, skip it...
thisGroupAllAtoms = false;
break;
}
thisGroupAtoms.add(a);
}
if (thisGroupAllAtoms) {
// add the atoms of this group to the array.
for (Atom a : thisGroupAtoms) {
atoms.add(a);
}
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Returns an Atom array of the C-alpha atoms. Any atom that is a carbon and
* has CA name will be returned.
*
* @param c
* the structure object
* @return an Atom[] array
* @see #getRepresentativeAtomArray(Chain)
*/
public static final Atom[] getAtomCAArray(Chain c) {
List<Atom> atoms = new ArrayList<Atom>();
for (Group g : c.getAtomGroups()) {
if (g.hasAtom(CA_ATOM_NAME)
&& g.getAtom(CA_ATOM_NAME).getElement() == Element.C) {
atoms.add(g.getAtom(CA_ATOM_NAME));
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Gets a representative atom for each group that is part of the chain
* backbone. Note that modified aminoacids won't be returned as part of the
* backbone if the {@link org.biojava.nbio.structure.io.mmcif.ReducedChemCompProvider} was used to load the
* structure.
*
* For amino acids, the representative is a CA carbon. For nucleotides, the
* representative is the {@value #NUCLEOTIDE_REPRESENTATIVE}. Other group
* types will be ignored.
*
* @param c
* @return representative Atoms of the chain backbone
* @since Biojava 4.1.0
*/
public static final Atom[] getRepresentativeAtomArray(Chain c) {
List<Atom> atoms = new ArrayList<Atom>();
for (Group g : c.getAtomGroups()) {
switch (g.getType()) {
case AMINOACID:
if (g.hasAtom(CA_ATOM_NAME)
&& g.getAtom(CA_ATOM_NAME).getElement() == Element.C) {
atoms.add(g.getAtom(CA_ATOM_NAME));
}
break;
case NUCLEOTIDE:
if (g.hasAtom(NUCLEOTIDE_REPRESENTATIVE)) {
atoms.add(g.getAtom(NUCLEOTIDE_REPRESENTATIVE));
}
break;
default:
// don't add
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Provides an equivalent copy of Atoms in a new array. Clones everything,
* starting with parent groups and chains. The chain will only contain
* groups that are part of the input array.
*
* @param ca
* array of representative atoms, e.g. CA atoms
* @return Atom array
* @deprecated Use the better-named {@link #cloneAtomArray(Atom[])} instead
*/
@Deprecated
public static final Atom[] cloneCAArray(Atom[] ca) {
return cloneAtomArray(ca);
}
/**
* Provides an equivalent copy of Atoms in a new array. Clones everything,
* starting with parent groups and chains. The chain will only contain
* groups that are part of the input array.
*
* @param ca
* array of representative atoms, e.g. CA atoms
* @return Atom array
* @since Biojava 4.1.0
*/
public static final Atom[] cloneAtomArray(Atom[] ca) {
Atom[] newCA = new Atom[ca.length];
List<Chain> model = new ArrayList<Chain>();
int apos = -1;
for (Atom a : ca) {
apos++;
Group parentG = a.getGroup();
Chain parentC = parentG.getChain();
Chain newChain = null;
for (Chain c : model) {
if (c.getName().equals(parentC.getName())) {
newChain = c;
break;
}
}
if (newChain == null) {
newChain = new ChainImpl();
newChain.setId(parentC.getId());
newChain.setName(parentC.getName());
model.add(newChain);
}
Group parentN = (Group) parentG.clone();
newCA[apos] = parentN.getAtom(a.getName());
try {
// if the group doesn't exist yet, this produces a StructureException
newChain.getGroupByPDB(parentN.getResidueNumber());
} catch (StructureException e) {
// the group doesn't exist yet in the newChain, let's add it
newChain.addGroup(parentN);
}
}
return newCA;
}
/**
* Clone a set of representative Atoms, but returns the parent groups
*
* @param ca
* Atom array
* @return Group array
*/
public static Group[] cloneGroups(Atom[] ca) {
Group[] newGroup = new Group[ca.length];
List<Chain> model = new ArrayList<Chain>();
int apos = -1;
for (Atom a : ca) {
apos++;
Group parentG = a.getGroup();
Chain parentC = parentG.getChain();
Chain newChain = null;
for (Chain c : model) {
if (c.getName().equals(parentC.getName())) {
newChain = c;
break;
}
}
if (newChain == null) {
newChain = new ChainImpl();
newChain.setName(parentC.getName());
model.add(newChain);
}
Group ng = (Group) parentG.clone();
newGroup[apos] = ng;
newChain.addGroup(ng);
}
return newGroup;
}
/**
* Utility method for working with circular permutations. Creates a
* duplicated and cloned set of Calpha atoms from the input array.
*
* @param ca2
* atom array
* @return cloned and duplicated set of input array
*/
public static Atom[] duplicateCA2(Atom[] ca2) {
// we don't want to rotate input atoms, do we?
Atom[] ca2clone = new Atom[ca2.length * 2];
int pos = 0;
Chain c = null;
String prevChainId = "";
for (Atom a : ca2) {
Group g = (Group) a.getGroup().clone(); // works because each group
// has only a single atom
if (c == null) {
c = new ChainImpl();
Chain orig = a.getGroup().getChain();
c.setId(orig.getId());
c.setName(orig.getName());
} else {
Chain orig = a.getGroup().getChain();
if (!orig.getId().equals(prevChainId)) {
c = new ChainImpl();
c.setId(orig.getId());
c.setName(orig.getName());
}
}
c.addGroup(g);
ca2clone[pos] = g.getAtom(a.getName());
pos++;
}
// Duplicate ca2!
c = null;
prevChainId = "";
for (Atom a : ca2) {
Group g = (Group) a.getGroup().clone();
if (c == null) {
c = new ChainImpl();
Chain orig = a.getGroup().getChain();
c.setId(orig.getId());
c.setName(orig.getName());
} else {
Chain orig = a.getGroup().getChain();
if (!orig.getId().equals(prevChainId)) {
c = new ChainImpl();
c.setId(orig.getId());
c.setName(orig.getName());
}
}
c.addGroup(g);
ca2clone[pos] = g.getAtom(a.getName());
pos++;
}
return ca2clone;
}
/**
* Return an Atom array of the C-alpha atoms. Any atom that is a carbon and
* has CA name will be returned.
*
* @param s
* the structure object
* @return an Atom[] array
* @see #getRepresentativeAtomArray(Structure)
*/
public static Atom[] getAtomCAArray(Structure s) {
List<Atom> atoms = new ArrayList<Atom>();
for (Chain c : s.getChains()) {
for (Group g : c.getAtomGroups()) {
if (g.hasAtom(CA_ATOM_NAME)
&& g.getAtom(CA_ATOM_NAME).getElement() == Element.C) {
atoms.add(g.getAtom(CA_ATOM_NAME));
}
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Gets a representative atom for each group that is part of the chain
* backbone. Note that modified aminoacids won't be returned as part of the
* backbone if the {@link org.biojava.nbio.structure.io.mmcif.ReducedChemCompProvider} was used to load the
* structure.
*
* For amino acids, the representative is a CA carbon. For nucleotides, the
* representative is the {@value #NUCLEOTIDE_REPRESENTATIVE}. Other group
* types will be ignored.
*
* @param s
* Input structure
* @return representative Atoms of the structure backbone
* @since Biojava 4.1.0
*/
public static Atom[] getRepresentativeAtomArray(Structure s) {
List<Atom> atoms = new ArrayList<Atom>();
for (Chain c : s.getChains()) {
Atom[] chainAtoms = getRepresentativeAtomArray(c);
for (Atom a : chainAtoms) {
atoms.add(a);
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Return an Atom array of the main chain atoms: CA, C, N, O Any group that
* contains those atoms will be included, be it a standard aminoacid or not
*
* @param s
* the structure object
* @return an Atom[] array
*/
public static Atom[] getBackboneAtomArray(Structure s) {
List<Atom> atoms = new ArrayList<Atom>();
for (Chain c : s.getChains()) {
for (Group g : c.getAtomGroups()) {
if (g.hasAminoAtoms()) {
// this means we will only take atoms grom groups that have
// complete backbones
for (Atom a : g.getAtoms()) {
switch (g.getType()) {
case NUCLEOTIDE:
// Nucleotide backbone
if (a.getName().equals(C1_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(C2_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(C3_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(C4_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(O2_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(O3_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(O4_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(O5_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(OP1_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(OP2_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(P_ATOM_NAME))
atoms.add(a);
// TODO Allow C4* names as well as C4'? -SB 3/2015
break;
case AMINOACID:
default:
// we do it this way instead of with g.getAtom() to
// be sure we always use the same order as original
if (a.getName().equals(CA_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(C_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(N_ATOM_NAME))
atoms.add(a);
if (a.getName().equals(O_ATOM_NAME))
atoms.add(a);
break;
}
}
}
}
}
return atoms.toArray(new Atom[atoms.size()]);
}
/**
* Convert three character amino acid codes into single character e.g.
* convert CYS to C. Valid 3-letter codes will be those of the standard 20
* amino acids plus MSE, CSE, SEC, PYH, PYL (see the {@link #aminoAcids}
* map)
*
* @return the 1 letter code, or null if the given 3 letter code does not
* correspond to an amino acid code
* @param groupCode3
* a three character amino acid representation String
* @see {@link #get1LetterCode(String)}
*/
public static final Character get1LetterCodeAmino(String groupCode3) {
return aminoAcids.get(groupCode3);
}
/**
*
* @param code3
* @return
* @deprecated Use {@link #get1LetterCodeAmino(String)} instead
*/
@Deprecated
public static final Character convert_3code_1code(String code3) {
return get1LetterCodeAmino(code3);