# BioSimSpace._SireWrappers.Molecule¶

class BioSimSpace._SireWrappers.Molecule(molecule)

A container class for storing a molecule.

__init__(molecule)

Constructor.

Parameters

molecule (Sire.Mol.Molecule, Molecule) – A Sire or BioSimSpace Molecule object.

Methods

 __init__(molecule) Constructor. charge([property_map, is_lambda1]) Return the charge. coordinates([property_map]) Return the coordinates of the atoms in the molecule. Return a copy of this object. Return a list containing the atoms in the molecule. getAxisAlignedBoundingBox([property_map]) Get the axis-aligned bounding box enclosing the object. Return a list containing the residues in the molecule. Whether this is an AMBER format water molecule. Whether this is a GROMACS format water molecule. Whether this molecule has been merged with another. Whether this is a water molecule. makeCompatibleWith(molecule[, property_map, …]) Make this molecule compatible with passed one, i.e. Return the component of the merged molecule at lambda = 0. Return the component of the merged molecule at lambda = 1. Return the number of atoms in the molecule. Return the number of chains in the molecule. Return the number of residues in the molecule. Return the number of the molecule. search(query) Search the molecule for atoms and residues. Convert a single Molecule to a System. translate(vector[, property_map]) Translate the object.
charge(property_map={}, is_lambda1=False)

Return the charge.

Parameters
• property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }

• is_lambda1 (bool) – Whether to use the charge at lambda = 1 if the object is peturbable.

Returns

charge – The charge.

Return type

Charge

coordinates(property_map={})

Return the coordinates of the atoms in the molecule.

Parameters

property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }

Returns

[coordinates] – The coordinates of the atoms in the molecule.

Return type

[class:Coordinate]

copy()

Return a copy of this object. The return type is same as the object on which copy is called.

Returns

system – A copy of the object.

Return type
getAtoms()

Return a list containing the atoms in the molecule.

Returns

atoms – The list of atoms in the molecule.

Return type
getAxisAlignedBoundingBox(property_map={})

Get the axis-aligned bounding box enclosing the object.

Parameters

property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }

Returns

• box_min ([Length]) – The minimum coordinates of the axis-aligned bounding box in each dimension.

• box_max ([Length]) – The minimum coordinates of the axis-aligned bounding box in each dimension.

getResidues()

Return a list containing the residues in the molecule.

Returns

residues – The list of residues in the molecule.

Return type
isAmberWater()

Whether this is an AMBER format water molecule.

Returns

is_amber_water – Whether this molecule is an AMBER format water.

Return type

bool

isGromacsWater()

Whether this is a GROMACS format water molecule.

Returns

is_gromacs_water – Whether this molecule is a GROMACS format water.

Return type

bool

isMerged()

Whether this molecule has been merged with another.

Returns

is_merged – Whether the molecule has been merged.

Return type

bool

isWater()

Whether this is a water molecule.

Returns

is_water – Whether this is a water molecule.

Return type

bool

makeCompatibleWith(molecule, property_map={}, overwrite=True, rename_atoms=False, verbose=False)

Make this molecule compatible with passed one, i.e. match atoms and add all additional properties from the passed molecule while preserving the topology and naming/numbering convention of this molecule.

Parameters
• molecule (Sire.Mol.Molecule, Molecule, Sire.System.System, System) – The molecule, or system of molecules, to match with.

• property_map (dict) – A map between property names and user supplied names.

• overwrite (bool) – Whether to overwrite any duplicate properties.

• rename_atoms (bool) – Whether to rename atoms if they have changed.

• verbose (bool) – Whether to report status updates to stdout.

molecule0()

Return the component of the merged molecule at lambda = 0.

Returns

molecule – The component of the merged molecule at lambda = 0. Returns None if this isn’t a merged molecule.

Return type

Molecule

molecule1()

Return the component of the merged molecule at lambda = 1.

Returns

molecule – The component of the merged molecule at lambda = 1. Returns None if this isn’t a merged molecule.

Return type

Molecule

nAtoms()

Return the number of atoms in the molecule.

Returns

num_atoms – The number of atoms in the molecule.

Return type

int

nChains()

Return the number of chains in the molecule.

Returns

num_chains – The number of chains in the molecule.

Return type

int

nResidues()

Return the number of residues in the molecule.

Returns

num_residues – The number of residues in the molecule.

Return type

int

number()

Return the number of the molecule. Each molecule has a unique identification number.

Returns

mol_num – The unique number of the molecule.

Return type

int

search(query)

Search the molecule for atoms and residues. Search results will be reduced to their minimal representation, i.e. a residue containing a single atom will be returned as a atom.

Parameters

query (str) – The search query.

Returns

results – A list of objects matching the search query.

Return type

Examples

Search for all residues named ALA.

>>> result = molecule.search("resname ALA")


Search for all oxygen or hydrogen atoms.

>>> result = molecule.search("element oxygen or element hydrogen")


Search for atom index 23.

>>> result = molecule.search("atomidx 23")

toSystem()

Convert a single Molecule to a System.

Returns

system

Return type

System

translate(vector, property_map={})

Translate the object.

Parameters
• vector ([Length]) – The translation vector in Angstroms.

• property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }