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IMP Reference Guide  2.18.0
The Integrative Modeling Platform
rmf/multiresolution.py

In this example a pdb is converted into a multiresolution model, somewhat painfully.

1 ## \example rmf/multiresolution.py
2 # In this example a pdb is converted into a multiresolution model,
3 # somewhat painfully.
4 
5 from __future__ import print_function, division
6 import IMP.atom
7 import sys
8 import RMF
9 import IMP.rmf
10 
11 IMP.setup_from_argv(sys.argv, "Create a multiresolution rmf file")
12 
13 pdbname = IMP.rmf.get_example_path("big.pdb")
14 
15 m = IMP.Model()
16 h = IMP.atom.read_pdb(pdbname, m)
18 
19 chains = IMP.atom.get_by_type(h, IMP.atom.CHAIN_TYPE)
20 
21 if IMP.get_bool_flag("run_quick_test"):
22  chains = [chains[0]]
23 
24 
25 def recursive_approximation(res):
26  print("approximating", res)
27  lr = len(res)
28  if lr <= 1:
29  return res
30  if lr > 4:
31  me = recursive_approximation(res[0:lr // 4])\
32  + recursive_approximation(res[lr // 4: lr // 2])\
33  + recursive_approximation(res[lr // 2: 3 * lr // 4])\
34  + recursive_approximation(res[3 * lr // 4: lr])
35  else:
36  me = res
37  p = IMP.Particle(m)
40  nm = str(IMP.atom.Residue(res[0]).get_index()) + "-"\
41  + str(IMP.atom.Residue(res[-1]).get_index())
42  p.set_name(nm)
43  for mm in me:
44  hc.add_child(mm)
45  return [hc]
46 
47 
48 for c in chains:
49  res = IMP.atom.get_by_type(h, IMP.atom.RESIDUE_TYPE)
50  for r in res:
51  c.remove_child(r)
52  lvs = IMP.atom.get_leaves(r)
54  lr = len(res)
55  me = recursive_approximation(res[0:lr // 4])\
56  + recursive_approximation(res[lr // 4: lr // 2])\
57  + recursive_approximation(res[lr // 2: 3 * lr // 4])\
58  + recursive_approximation(res[3 * lr // 4: lr])
59  for mm in me:
60  c.add_child(mm)
61 
62 print("writing")
63 fn = "multires.rmf"
64 rmf = RMF.create_rmf_file(fn)
65 print("adding")
66 IMP.rmf.add_hierarchies(rmf, chains)
67 
68 print("see file", fn)