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IMP
2.4.0
The Integrative Modeling Platform
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IMP
2.4.0
The Integrative Modeling Platform
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Set up the representation of all proteins and nucleic acid macromolecules. More...
Inherits object.
Set up the representation of all proteins and nucleic acid macromolecules.
Create the molecular hierarchies, representation, sequence connectivity for the various involved proteins and nucleic acid macromolecules:
Create a protein, DNA or RNA, represent it as a set of connected balls of appropriate radii and number of residues, PDB at given resolution(s), or ideal helices.
How to use the SimplifiedModel class (typical use):
see test/test_hierarchy_contruction.py
examples:
1) Create a chain of helices and flexible parts
c_1_119 =self.add_component_necklace("prot1",1,119,20) c_120_131 =self.add_component_ideal_helix("prot1",resolutions=[1,10],resrange=(120,131)) c_132_138 =self.add_component_beads("prot1",[(132,138)]) c_139_156 =self.add_component_ideal_helix("prot1",resolutions=[1,10],resrange=(139,156)) c_157_174 =self.add_component_beads("prot1",[(157,174)]) c_175_182 =self.add_component_ideal_helix("prot1",resolutions=[1,10],resrange=(175,182)) c_183_194 =self.add_component_beads("prot1",[(183,194)]) c_195_216 =self.add_component_ideal_helix("prot1",resolutions=[1,10],resrange=(195,216)) c_217_250 =self.add_component_beads("prot1",[(217,250)])
self.set_rigid_body_from_hierarchies(c_120_131) self.set_rigid_body_from_hierarchies(c_139_156) self.set_rigid_body_from_hierarchies(c_175_182) self.set_rigid_body_from_hierarchies(c_195_216)
clist=[c_1_119,c_120_131,c_132_138,c_139_156,c_157_174,c_175_182,c_183_194,c_195_216, c_217_250]
self.set_chain_of_super_rigid_bodies(clist,2,3)
self.set_super_rigid_bodies(["prot1"])
Definition at line 45 of file pmi/representation.py.
Public Member Functions | |
| def | __init__ |
| Constructor. More... | |
| def | add_component_pdb |
| Add a component that has an associated 3D structure in a PDB file. More... | |
| def | add_component_sequence |
| Add the primary sequence for a single component. More... | |
the component name | |
add beads to the representation a list of tuples corresponding to the residue ranges of the beads a list of colors associated to the beads the coordinate tuple correspoding to the position of the beads | |
| def | add_component_beads |
| def | add_component_necklace |
| Generates a string of beads with given length. More... | |
| def | add_component_density |
| Sets up a Gaussian Mixture Model for this component. More... | |
| def | add_all_atom_densities |
| Decorates all specified particles as Gaussians directly. More... | |
| def | add_component_hierarchy_clone |
| Make a copy of a hierarchy and append it to a component. More... | |
| def | set_coordinates_from_rmf |
| Read and replace coordinates from an RMF file. More... | |
| def | check_root |
| If the root hierarchy does not exist, construct it. More... | |
| def | coarse_hierarchy |
| Generate all needed coarse grained layers. More... | |
| def | get_hierarchies_at_given_resolution |
| Get the hierarchies at the given resolution. More... | |
| def | shuffle_configuration |
| Shuffle configuration; used to restart the optimization. More... | |
| def | setup_component_sequence_connectivity |
| Generate restraints between contiguous fragments in the hierarchy. More... | |
| def | link_components_to_rmf |
| Load coordinates in the current representation. More... | |
| def | create_components_from_rmf |
| still not working. More... | |
| def | set_rigid_body_from_hierarchies |
| Construct a rigid body from hierarchies (and optionally particles). More... | |
| def | set_rigid_bodies |
| Construct a rigid body from a list of subunits. More... | |
| def | set_chain_of_super_rigid_bodies |
| Make a chain of super rigid bodies from a list of hierarchies. More... | |
| def | remove_floppy_bodies |
| Remove leaves of hierarchies from the floppy bodies list. More... | |
| def | get_particles_from_selection_tuples |
| selection tuples must be [(r1,r2,"name1"),(r1,r2,"name2"),.... More... | |
| def | set_rigid_bodies_as_fixed |
| Fix rigid bodies in their actual position. More... | |
| def IMP.pmi.representation.Representation.__init__ | ( | self, | |
| m, | |||
upperharmonic = True, |
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disorderedlength = True |
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Constructor.
| m | the model |
| upperharmonic | This flag uses either harmonic (False) or upperharmonic (True) in the intra-pair connectivity restraint. |
| disorderedlength | This flag uses either disordered length calculated for random coil peptides (True) or zero surface-to-surface distance between beads (False) as optimal distance for the sequence connectivity restraint. |
Definition at line 72 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.add_all_atom_densities | ( | self, | |
| name, | |||
hierarchies = None, |
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selection_tuples = None, |
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particles = None, |
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resolution = 0, |
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output_map = None, |
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voxel_size = 1.0 |
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| ) |
Decorates all specified particles as Gaussians directly.
| name | component name |
| hierarchies | set up GMM for some hierarchies |
| selection_tuples | (list of tuples) example (first_residue,last_residue,component_name) |
| particles | set up GMM for particles directly |
| resolution | usual PMI resolution for selecting particles from the hierarchies |
| intermediate_map_fn | for debugging, this will write the itermediate (simulated) map |
Definition at line 735 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.add_component_density | ( | self, | |
| name, | |||
hierarchies = None, |
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selection_tuples = None, |
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particles = None, |
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resolution = 0.0, |
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num_components = 10, |
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inputfile = None, |
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outputfile = None, |
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outputmap = None, |
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kernel_type = None, |
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covariance_type = 'full', |
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voxel_size = 1.0, |
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out_hier_name = '', |
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sampled_points = 1000000, |
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num_iter = 100, |
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simulation_res = 1.0, |
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multiply_by_total_mass = True, |
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transform = None, |
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intermediate_map_fn = None, |
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density_ps_to_copy = None, |
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use_precomputed_gaussians = False |
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| ) |
Sets up a Gaussian Mixture Model for this component.
Can specify input GMM file or it will be computed. name component name
| hierarchies | set up GMM for some hierarchies |
| selection_tuples | (list of tuples) example (first_residue,last_residue,component_name) |
| particles | set up GMM for particles directly |
| resolution | usual PMI resolution for selecting particles from the hierarchies |
| inputfile | read the GMM from this file |
| outputfile | fit and write the GMM to this file (text) |
| outputmap | after fitting, create GMM density file (mrc) |
| kernel_type | for creating the intermediate density (points are sampled to make GMM). Options are IMP.em.GAUSSIAN, IMP.em.SPHERE, and IMP.em.BINARIZED_SPHERE |
| covariance_type | for fitting the GMM. options are 'full', 'diagonal' and 'spherical' |
| voxel_size | for creating the intermediate density map and output map. lower number increases accuracy but also rasterizing time grows |
| out_hier_name | name of the output density hierarchy |
| sampled_points | number of points to sample. more will increase accuracy and fitting time |
| num_iter | num GMM iterations. more will increase accuracy and fitting time |
| multiply_by_total_mass | multiply the weights of the GMM by this value (only works on creation!) |
| transform | for input file only, apply a transformation (eg for multiple copies same GMM) |
| intermediate_map_fn | for debugging, this will write the itermediate (simulated) map |
| density_ps_to_copy | in case you already created the appropriate GMM (eg, for beads) |
| use_precomputed_gaussians | Set this flag and pass fragments - will use roughly spherical Gaussian setup |
Definition at line 608 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.add_component_hierarchy_clone | ( | self, | |
| name, | |||
| hierarchy | |||
| ) |
Make a copy of a hierarchy and append it to a component.
Definition at line 796 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.add_component_necklace | ( | self, | |
| name, | |||
| begin, | |||
| end, | |||
| length, | |||
color = None, |
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incoord = None |
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| ) |
Generates a string of beads with given length.
Definition at line 584 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.add_component_pdb | ( | self, | |
| name, | |||
| pdbname, | |||
| chain, | |||
| resolutions, | |||
color = None, |
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resrange = None, |
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offset = 0, |
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cacenters = True, |
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show = False, |
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isnucleicacid = False, |
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readnonwateratoms = False, |
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read_ca_cb_only = False |
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| ) |
Add a component that has an associated 3D structure in a PDB file.
Reads the PDB, and constructs the fragments corresponding to contiguous senquence stretches.
| name | (string) the name of the component |
| pdbname | (string) the name of the PDB file |
| chain | (string or integer) can be either a string (eg, "A") or an integer (eg, 0 or 1) in case you want to get the corresponding chain number in the PDB. |
| resolutions | (integers) a list of integers that corresponds to the resolutions that have to be generated |
| color | (float from 0 to 1) the color applied to the hierarchies generated |
| resrange | (tuple of integers): the residue range to extract from the PDB. It is a tuple (beg,end). If not specified, all residues belonging to the specified chain are read. |
| offset | (integer) specifies the residue index offset to be applied when reading the PDB (the FASTA sequence is assumed to start from residue 1, so use this parameter if the PDB file does not start at residue 1) |
| cacenters | (boolean) if True generates resolution=1 beads centered on C-alpha atoms. |
| show | (boolean) print out the molecular hierarchy at the end. |
| isnucleicacid | (boolean) use True if you're reading a PDB with nucleic acids. |
| readnonwateratoms | (boolean) if True fixes some pathological PDB. |
| read_ca_cb_only | (boolean) if True, only reads CA/CB |
Definition at line 303 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.add_component_sequence | ( | self, | |
| name, | |||
| filename, | |||
id = None, |
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offs = None, |
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format = 'FASTA' |
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| ) |
Add the primary sequence for a single component.
| name | Human-readable name of the component |
| filename | Name of the FASTA file |
| id | Identifier of the sequence in the FASTA file header (if not provided, use name instead) |
Definition at line 174 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.check_root | ( | self, | |
| name, | |||
| protein_h, | |||
| resolution | |||
| ) |
If the root hierarchy does not exist, construct it.
Definition at line 892 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.coarse_hierarchy | ( | self, | |
| name, | |||
| start, | |||
| end, | |||
| resolutions, | |||
| isnucleicacid, | |||
| input_hierarchy, | |||
| protein_h, | |||
| type, | |||
| color | |||
| ) |
Generate all needed coarse grained layers.
| name | name of the protein |
| resolutions | list of resolutions |
| protein_h | root hierarchy |
| input_hierarchy | hierarchy to coarse grain |
| type | a string, typically "pdb" or "helix" |
Definition at line 903 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.create_components_from_rmf | ( | self, | |
| rmfname, | |||
| frameindex | |||
| ) |
still not working.
create the representation (i.e. hierarchies) from the rmf file. it will be stored in self.prot, which will be overwritten. load the coordinates from the rmf file at frameindex.
Definition at line 1459 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.get_hierarchies_at_given_resolution | ( | self, | |
| resolution | |||
| ) |
Get the hierarchies at the given resolution.
The map between resolution and hierarchies is cached to accelerate the selection algorithm. The cache is invalidated when the representation was changed by any add_component_xxx.
Definition at line 1043 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.get_particles_from_selection_tuples | ( | self, | |
| selection_tuples, | |||
resolution = None |
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| ) |
selection tuples must be [(r1,r2,"name1"),(r1,r2,"name2"),....
]
Definition at line 1691 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.link_components_to_rmf | ( | self, | |
| rmfname, | |||
| frameindex | |||
| ) |
Load coordinates in the current representation.
This should be done only if the hierarchy self.prot is identical to the one as stored in the rmf i.e. all components were added.
Definition at line 1445 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.remove_floppy_bodies | ( | self, | |
| hierarchies | |||
| ) |
Remove leaves of hierarchies from the floppy bodies list.
Given a list of hierarchies, get the leaves and remove the corresponding particles from the floppy bodies list. We need this function because sometimes we want to constrain the floppy bodies in a rigid body - for instance when you want to associate a bead with a density particle.
Definition at line 1652 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.set_chain_of_super_rigid_bodies | ( | self, | |
| hiers, | |||
min_length = None, |
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max_length = None, |
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axis = None |
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| ) |
Make a chain of super rigid bodies from a list of hierarchies.
Takes a linear list of hierarchies (they are supposed to be sequence-contiguous) and produces a chain of super rigid bodies with given length range, specified by min_length and max_length.
Definition at line 1604 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.set_coordinates_from_rmf | ( | self, | |
| component_name, | |||
| rmf_file_name, | |||
| rmf_frame_number, | |||
rmf_component_name = None, |
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check_number_particles = True |
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| ) |
Read and replace coordinates from an RMF file.
Replace the coordinates of particles with the same name. It assumes that the RMF and the representation have the particles in the same order.
| component_name | Component name |
| rmf_component_name | Name of the component in the RMF file (if not specified, use component_name) |
Definition at line 834 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.set_rigid_bodies | ( | self, | |
| subunits | |||
| ) |
Construct a rigid body from a list of subunits.
Each subunit is a tuple that identifies the residue ranges and the component name (as used in create_component()).
subunits: [(name_1,(first_residue_1,last_residue_1)),(name_2,(first_residue_2,last_residue_2)),.....] or [name_1,name_2,(name_3,(first_residue_3,last_residue_3)),.....]
example: ["prot1","prot2",("prot3",(1,10))]
sometimes, we know about structure of an interaction and here we make such PPIs rigid
Definition at line 1518 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.set_rigid_bodies_as_fixed | ( | self, | |
rigidbodiesarefixed = True |
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| ) |
Fix rigid bodies in their actual position.
The get_particles_to_sample() function will return just the floppy bodies.
Definition at line 1726 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.set_rigid_body_from_hierarchies | ( | self, | |
| hiers, | |||
particles = None |
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| ) |
Construct a rigid body from hierarchies (and optionally particles).
| hiers | list of hierarchies to make rigid particles list of particles to add to the rigid body |
Definition at line 1481 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.setup_component_sequence_connectivity | ( | self, | |
| name, | |||
resolution = 10, |
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scale = 1.0 |
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| ) |
Generate restraints between contiguous fragments in the hierarchy.
The linkers are generated at resolution 10 by default.
Definition at line 1268 of file pmi/representation.py.
| def IMP.pmi.representation.Representation.shuffle_configuration | ( | self, | |
max_translation = 300.0, |
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max_rotation = 2.0 * pi, |
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avoidcollision = True, |
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cutoff = 10.0, |
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niterations = 100, |
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bounding_box = None, |
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excluded_rigid_bodies = None, |
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hierarchies_excluded_from_collision = None |
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| ) |
Shuffle configuration; used to restart the optimization.
The configuration of the system is initialized by placing each rigid body and each bead randomly in a box with a side of max_translation angstroms, and far enough from each other to prevent any steric clashes. The rigid bodies are also randomly rotated.
| avoidcollision | check if the particle/rigid body was placed close to another particle; uses the optional arguments cutoff and niterations |
| bounding_box | defined by ((x1,y1,z1),(x2,y2,z2)) |
Definition at line 1067 of file pmi/representation.py.