/usr/lib/python2.7/dist-packages/csb/bio/fragments/rosetta.py is in python-csb 1.2.2+dfsg-2ubuntu1.
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Rosetta fragment libraries.
This module defines the L{RosettaFragmentMap} objects, which describes a
fragment library in Rosetta NNmake format. L{RosettaFragmentMap} has a
static factory method for building a library from a fragment file:
>>> RosettaFragmentMap.read('fragments.txt')
<RosettaFragmentMap>
@note: Consider extracting L{RosettaFragmentMap.read} as a Rosetta
fragment parser which naturally belongs to csb.bio.io.
"""
from csb.bio.structure import TorsionAnglesCollection, TorsionAngles
from csb.core import AbstractContainer
class ResidueInfo(object):
"""
Container struct for a single rosetta fragment residue.
@param rank: residue position (in the source chain, 1-based)
@type rank: int
@param aa: amino acid
@type aa: str
@param ss: secondary structure
@type ss: str
@param torsion: torsion angles
@type torsion: L{csb.bio.structure.TorsionAngles}
"""
def __init__(self, rank, aa, ss, torsion, calpha=[]):
self.rank = rank
self.aa = aa
self.ss = ss
self.torsion = torsion
self.calpha = tuple(calpha)
@property
def phi(self):
return self.torsion.phi or 0.
@property
def psi(self):
return self.torsion.psi or 0.
@property
def omega(self):
return self.torsion.omega or 0.
def copy(self):
"""
@return: a deep copy of the struct
@rtype: L{ResidueInfo}
"""
return ResidueInfo(self.rank, self.aa, self.ss, self.torsion.copy(), self.calpha)
class RosettaFragment(object):
"""
Represents a single Rosetta fragment match.
@param source_id: entry ID of the source PDB chain (in accnC format)
@type source_id: str
@param qstart: start position in target (rank)
@type qstart: int
@param qend: end position in target (rank)
@type qend: int
@param start: start position in C{source} (rank)
@type start: int
@param end: end position in C{source} (rank)
@type end: int
@param score: score of the fragment
@type score: float
@param residues: fragment residue structs
@type residues: iterable of L{ResidueInfo}
"""
def __init__(self, source_id, qstart, qend, start, end, score, residues):
if not (qend - qstart + 1) == (end - start + 1) == len(residues):
raise ValueError()
if not len(source_id) == 5:
raise ValueError(source_id)
self._source_id = str(source_id)
self._qstart = int(qstart)
self._qend = int(qend)
self._start = int(start)
self._end = int(end)
self._score = float(score)
self._residues = list(residues)
def subregion(self, qstart, qend):
"""
Extract a subregion from the fragment.
@param qstart: start position in target
@type qstart: int
@param qend: end position in target
@type qend: int
@return: a new fragment (deep copy)
@rtype: L{RosettaFragment}
"""
if not self.qstart <= qstart <= qend <= self.qend:
raise ValueError('Invalid subregion')
start = qstart - self.qstart + self.start
end = qend - self.qend + self.end
diff = qstart - self.qstart
size = qend - qstart + 1
assert 0 <= diff
residues = [ r.copy() for r in self.residues[diff : diff + size] ]
assert len(residues) == size
return RosettaFragment(self.source_id, qstart, qend, start, end, self.score, residues)
def __lt__(self, other):
# lower score means a better fragment
return self.score < other.score
def __iter__(self):
return iter(self._residues)
def __len__(self):
return len(self._residues)
def __str__(self):
out = []
for residue in self.residues:
line = ' {0.accession:4} {0.chain:1} {1.rank:>5} {1.aa:1} {1.ss:1} {1.phi:>8.3f} {1.psi:>8.3f} {1.omega:>8.3f} {0.score:>8.3f}'
out.append(line.format(self, residue))
return '\n'.join(out)
@staticmethod
def from_object(assignment):
"""
Factory method: build a rosetta fragment from an assignment object.
@param assignment: source assignment
@type assignment: L{Assignment}
@rtype: L{RosettaFragment}
"""
residues = []
a = assignment
for rank, aa, torsion, calpha in zip(range(a.start, a.end + 1), a.sequence, a.torsion, a.backbone):
residues.append(ResidueInfo(rank, aa, 'L', torsion, calpha))
return RosettaFragment(a.source_id, a.qstart, a.qend, a.start, a.end, 1 - (a.probability or 0.0), residues)
@property
def length(self):
return len(self)
@property
def source_id(self):
return self._source_id
@property
def accession(self):
return self.source_id[:4]
@property
def chain(self):
return self.source_id[4:]
@property
def id(self):
return '{0.source_id}:{0.start}-{0.end}'.format(self)
@property
def qstart(self):
return self._qstart
@property
def qend(self):
return self._qend
@property
def start(self):
return self._start
@property
def end(self):
return self._end
@property
def score(self):
return self._score
@property
def residues(self):
return tuple(self._residues)
@property
def torsion(self):
return TorsionAnglesCollection([r.torsion for r in self._residues], start=0)
class OutputBuilder(object):
"""
Rosetta fragment file formatter.
@param output: destination stream
@type output: file
"""
def __init__(self, output):
self._out = output
@property
def output(self):
return self._out
def add_position(self, qstart, frags):
"""
Write a new assignment origin.
@param qstart: target position
@type qstart: float
@param frags: number of fragments, starting at that position
@type frags: int
"""
self.output.write(' position: {0:>12} neighbors: {1:>12}\n\n'.format(qstart, len(frags)))
def add_fragment(self, fragment):
"""
Write a new fragment.
@type fragment: L{RosettaFragment}
"""
for residue in fragment.residues:
self.add_residue(fragment, residue)
self.output.write('\n')
self.output.write('\n')
def add_residue(self, fragment, residue):
"""
Write a new fragment residue.
@type fragment: L{RosettaFragment}
@type residue: L{ResidueInfo}
"""
line = ' {0.accession:4} {0.chain:1} {1.rank:>5} {1.aa:1} {1.ss:1} {1.phi:>8.3f} {1.psi:>8.3f} {1.omega:>8.3f} {0.score:>8.3f}'
self.output.write(line.format(fragment, residue))
class ExtendedOutputBuilder(OutputBuilder):
"""
Builds non-standard fragment files, which contain the CA coordinates of
each residue at the end of each line.
"""
def add_residue(self, fragment, residue):
super(ExtendedOutputBuilder, self).add_residue(fragment, residue)
if residue.calpha:
calpha = residue.calpha
else:
calpha = [0, 0, 0]
self.output.write(' {0:>7.3f} {1:>7.3f} {2:>7.3f}'.format(*calpha))
class RosettaFragmentMap(AbstractContainer):
"""
Represents a Rosetta fragment library.
@param fragments: library fragments
@type fragments: iterable of L{RosettaFragment}
@param length: target sequence's length. If not defined, the qend of the
last fragment will be used instead.
@type length: int
"""
def __init__(self, fragments, length=None):
self._fragments = []
self._unconf = set()
self._sources = set()
self._starts = set()
self._ends = set()
self._length = None
for f in fragments:
self.append(f)
if length is not None:
assert length >= self._maxend
self._length = int(length)
else:
self._length = self._maxend
@property
def _maxend(self):
return max(self._ends or [0])
def append(self, fragment):
"""
Append a new L{RosettaFragment}
"""
if self._length and fragment.qend > self._length:
raise ValueError('fragment out of range')
self._fragments.append(fragment)
self._sources.add(fragment.accession)
self._starts.add(fragment.qstart)
self._ends.add(fragment.qend)
def __len__(self):
return len(self._fragments)
@property
def _children(self):
return self._fragments
@property
def unconfident_positions(self):
return tuple(sorted(self._unconf))
@property
def size(self):
return len(self)
@property
def sources(self):
return tuple(self._sources)
@property
def start_positions(self):
return tuple(sorted(self._starts))
def fromsource(self, accession):
"""
@return: a tuple of all fragments, extracted from the specified C{source}.
@param accession: source entry ID
@type accession: str
"""
return tuple(f for f in self._fragments if f.accession == accession)
def starting_at(self, qrank):
"""
@return: a tuple of all fragments, starting at the specified target position.
@param qrank: fragment origin (in target, rank)
@type qrank: int
"""
return tuple(f for f in self._fragments if f.qstart == qrank)
def at(self, qrank):
"""
@return: a tuple of all fragments, covering the specified position.
@param qrank: position in target, rank
@type qrank: int
"""
return tuple(f for f in self._fragments if f.qstart <= qrank <= f.qend)
def mark_unconfident(self, rank):
"""
Mark the specified position in the target as a low-confidence one.
@param rank: position in target
@type rank: int
"""
if not 1 <= rank <= self._length:
raise ValueError(rank)
self._unconf.add(rank)
def complement(self, fragment):
"""
Append C{fragment} to the library, if the fragment is anchored
around a low-confidence position.
@type fragment: L{RosettaFragment}
"""
if not self._unconf:
raise ValueError('no unconfident regions to complement')
f = fragment
for rank in self._unconf:
if f.qstart < rank < f.qend:
if (rank - f.qstart + 1) > 0.4 * (f.qend - f.qstart + 1):
self.append(f)
break
def sort(self, field='score', reverse=False):
"""
Sort the fragments in the library.
"""
self._fragments.sort(key=lambda i:getattr(i, field), reverse=reverse)
def dump(self, file, builder=OutputBuilder):
"""
Write the library to a Rosetta fragment file.
@param file: destination file name
@type file: str
"""
with open(file, 'w') as out:
builder = builder(out)
for qstart in self.start_positions:
frags = self.starting_at(qstart)
builder.add_position(qstart, frags)
for fragment in frags:
builder.add_fragment(fragment)
@staticmethod
def read(file, top=None):
"""
Read a standard fragment file.
@param file: file name
@type file: str
@param top: if defined, read only C{top} fragments per start position
(default=all)
@type top: int or None
@return: parsed fragment library
@rtype: L{RosettaFragmentMap}
"""
# This is the format (rosetta_fragments/nnmake/makeoutput.f):
# source chain rank residue ss phi psi omega score dme dme_f best_nn_ss_type dipolar+noe 'P' position 'F' fragment#
def ang(a):
a = float(a)
if a < -180: return 360 + a
elif a > 180: return -360 + a
else: return a
frags = []
qstart, qend, start, end = 0, 0, 0, 0
id = ''
score = None
count = 0
residues = []
in_frag = False
for line in open(file):
if line.startswith(' position:'):
qstart = int(line.split()[1])
count = 0
elif not line.strip():
if in_frag:
count += 1
if not top or count <= top:
frags.append(RosettaFragment(id, qstart, qend, start, end, score, residues))
in_frag = False
id = ''
start = 0
end = 0
score = None
residues = []
else:
fields = line.split()
if not in_frag:
start = int(fields[2])
qend = qstart
in_frag = True
else:
qend += 1
end = int(fields[2])
id = fields[0].lower() + fields[1]
score = float(fields[8])
rank = int(fields[2])
aa, ss = fields[3:5]
phi, psi, omega = map(ang, fields[5:8])
residues.append(ResidueInfo(rank, aa, ss, TorsionAngles(phi, psi, omega)))
return RosettaFragmentMap(frags)
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