April 2009 - modeller_usage

Multiple Alignment Problem
by •·.·´¯`·.·• Iƒƒ¥ •·.·´¯`·.·• 30 Apr '09

30 Apr '09

Hello, I had already sent a mail but did got any response. Please help me out in this problem. Which alignment method should I go for? I have done alignment through salign as mentioned in advance tutorial but i think it dosent gives good alignment.File AIRE_mult.ali and align2d_mult are attached. Thats why I separately aligned template sequences with protien sequence using align2d.py one by one and then wrote the result in one file by myself i-e. Mannual_Alignment.ali. Is this the rite way … [View More]

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Need Help with model accuracy
by Mª Victoria Ruiz Pérez 30 Apr '09

30 Apr '09

Hello all, I´m a begginer user of MODELLER, and I have a question for you: I´m making docking experiments, and the protein I have got from the PDB has some gaps, so the docking can´t go on. So, I thought I could model the protein using its own cristal as template. So I did, but the models I got don´t fit very well with the original cristal (when I superimpose them with MacPyMol, the models are very deviated from the cristal). What can I do to improve the adjustment between models and template?… [View More]

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resolution
by Marc De Maeyer 30 Apr '09

30 Apr '09

After executing the modeller compare.py command I noticed that the resolution is incorrectly listed in the log file. as an example the resolution for the 1GV0.pdb this is not 2.0 but 2.5 REMARK 2 RESOLUTION. 2.5 ANGSTROMS. Do I interprete this value incorrectly? .------------------------------------------ 1a5zA @2.0 62.0000 | .------------------------------------------------ 1ez4B @2.0 69.3750 … [View More]

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Fwd: Multiple Alignment Error
by •·.·´¯`·.·• Iƒƒ¥ •·.·´¯`·.·• 27 Apr '09

27 Apr '09

Hello, I m having problems in multiple alignment through modeller. I have protien sequence in fasta format and am doing alignment from the start. For this purpose i have used model-full.py file but it gives the following error. I am unable to understand the error. What I m doing wrong? Files are attached Regards, Thanks

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A problem for using loop models: the metal ions came together too close
by wayj86 wayj86 22 Apr '09

22 Apr '09

Hi, Yesterday I wanted to build a metalloprotease which had 4 metal ions (my modeller version is 9v4). Due to the low similarity with the templates, some loops emerged in the resulting models. Althought GA341 scores ==1 and DOPE score are ≈-30119，when I checked them with Procheck and Errat, the stereochemical quality and overall quality factor were somewhat poor. So I decided to try the loop modelling and loop optimization to improve the models since no better templates could be found. The … [View More]script was below: # Homology modeling by the automodel class from modeller import * # Load standard Modeller classes from modeller.automodel import * # Load the automodel class log.verbose() # request verbose output env = environ() # create a new MODELLER environment to build this model in # directories for input atom files env.io.atom_files_directory = './:../atom_files' # Read in HETATM records from template PDBs env.io.hetatm = True a = loopmodel(env, alnfile = 'MPD.ali', # alignment filename knowns = ('a','b','c','d','e'), # sequence = 'MPD', assess_methods=(assess.DOPE, assess.GA341)) a.starting_model= 1 # index of the first model a.ending_model = 10 # index of the last model # Very thorough VTFM optimization: a.library_schedule = autosched.slow a.max_var_iterations = 300 # Thorough MD optimization: a.md_level = refine.slow a.loop.starting_model = 1 # First loop model a.loop.ending_model = 4 # Last loop model a.loop.md_level = refine.fast # Loop model refinement level # Repeat the whole cycle 2 times and do not stop unless obj.func. > 1E6 a.repeat_optimization = 3 a.max_molpdf = 1e6 a.make() # Get a list of all successfully built models from a.outputs ok_models = filter(lambda x: x['failure'] is None, a.outputs) # Rank the models by DOPE score key = 'DOPE score' ok_models.sort(lambda a,b: cmp(a[key], b[key])) # Get top model m = ok_models[0] print "Top model: %s (DOPE score %.3f)" % (m['name'], m[key]) After running again I found that althought in some models the overall quality factor did increase, in all of them the metal ions were almost merged. Their coordinates were taken too close together. So I was wondering was it because the resid for ions were numbered after the protein residues (in my model the resid for ions were 312, 313, 314 and 315) and loop modelling tended to put them together? If so how should I modify the script and multiple alignment file ( in multiple alignment file for the target the initial and final residues must be designated, like "sequence:MPD:1 : :311 : ::: :", if I hope to redefine the resids for ions, some change may also be required in this file) ? Thank you very much for any help. Best wishes, Stanley -- The future is now! [View Less]

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Modelling a multiheme cytochrome
by Stephen.Hearnshaw＠uea.ac.uk 07 Apr '09

07 Apr '09

Dear all, Many thanks for your previous help with my copper binding proteins and I will apologies in advance for the length of this query! I require some guidance with a modelling problem I am having. I am attempting to model the structure of a 258 residue segment of a decaheme cytochrome, I have template models covering the positions of the 10 hemes and the first 223 residues. I have also implemented several distance and bond angle restraints on the heme binding residues in an attempt to … [View More]correctly orientate them around the hemes, however when I run modeller some of the restraints dont seem to take affect. A specific example is residue 258 that (if I have implemented the script correctly) should be within 2.0A of the Fe atom from heme 268, however, in the final model it is 50A away from the heme and has been pulled 50A apart. The following is the complete script I have used for my modelling attempts: --------------------------------------------------------------------------- # Addition of restraints to the default ones from modeller import * from modeller.automodel import * # Load the automodel class log.verbose() class MyModel(automodel): def select_atoms(self): return selection(self.residue_range('1:', '258:')) def special_restraints(self, aln): rsr = self.restraints at = self.atoms # Restrict secondary structure, Residues that should be an alpha helix: rsr.add(secondary_structure.alpha(self.residue_range('16:', '19:'))) rsr.add(secondary_structure.alpha(self.residue_range('42:', '43:'))) rsr.add(secondary_structure.alpha(self.residue_range('48:', '49:'))) rsr.add(secondary_structure.alpha(self.residue_range('70:', '73:'))) rsr.add(secondary_structure.alpha(self.residue_range('78:', '80:'))) rsr.add(secondary_structure.alpha(self.residue_range('84:', '87:'))) rsr.add(secondary_structure.alpha(self.residue_range('132:', '134:'))) rsr.add(secondary_structure.alpha(self.residue_range('150:', '151:'))) rsr.add(secondary_structure.alpha(self.residue_range('162:', '164:'))) rsr.add(secondary_structure.alpha(self.residue_range('170:', '178:'))) rsr.add(secondary_structure.alpha(self.residue_range('216:', '222:'))) rsr.add(secondary_structure.alpha(self.residue_range('254:', '256:'))) # Add distance restraints to heme binding CXXCH residues: rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:41'], at['CAB:260']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:44'], at['CAC:260']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:45'], at['FE:260']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:77'], at['CAB:261']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:80'], at['CAC:261']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:81'], at['FE:261']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:101'], at['CAB:262']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:104'], at['CAC:262']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:105'], at['FE:262']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:124'], at['CAB:263']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:127'], at['CAC:263']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:128'], at['FE:263']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:150'], at['CAB:264']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:153'], at['CAC:264']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:154'], at['FE:264']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:174'], at['CAB:265']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:177'], at['CAC:265']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:178'], at['FE:265']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:196'], at['CAB:266']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:199'], at['CAC:266']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:200'], at['FE:266']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:219'], at['CAB:267']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:222'], at['CAC:267']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:223'], at['FE:267']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:8'], at['CAB:259']), mean=1.825, stdev=0.01)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['SG:11'], at['CAC:259']), mean=1.825, stdev=0.01)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:12'], at['FE:259']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.upper_distance, feature=features.distance(at['SG:254'], at['CAB:268']), mean=1.825, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.upper_distance, feature=features.distance(at['SG:257'], at['CAC:268']), mean=1.825, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.upper_distance, feature=features.distance(at['NE2:258'], at['FE:268']), mean=2.0, stdev=0.1)) # Add distance restraints to the other heme binding His residues: rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:51'], at['FE:259']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:108'], at['FE:260']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:26'], at['FE:261']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:94'], at['FE:262']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:93'], at['FE:263']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:203'], at['FE:264']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:141'], at['FE:265']), mean=2.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:189'], at['FE:267']), mean=2.0, stdev=0.1)) rsr.add(forms.upper_bound(group=physical.xy_distance, feature=features.distance(at['NE2:228'], at['FE:268']), mean=2.0, stdev=0.1)) # Set distance restraints for Heme binding His-His residues at 4.0A rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:12'], at['NE2:51']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:45'], at['NE2:108']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:81'], at['NE2:26']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:105'], at['NE2:94']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:128'], at['NE2:93']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:154'], at['NE2:203']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:178'], at['NE2:141']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:223'], at['NE2:189']), mean=4.0, stdev=0.1)) rsr.add(forms.gaussian(group=physical.xy_distance, feature=features.distance(at['NE2:258'], at['NE2:228']), mean=4.0, stdev=0.1)) # Set bond angles for iron coordinating HIS residues of CXXCH motifs rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:12'], at['FE:259'], at['CHA:259']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:45'], at['FE:260'], at['CHA:260']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:81'], at['FE:261'], at['CHA:261']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:105'], at['FE:262'], at['CHA:262']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:128'], at['FE:263'], at['CHA:263']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:154'], at['FE:264'], at['CHA:264']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:178'], at['FE:265'], at['CHA:265']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:200'], at['FE:266'], at['CHA:266']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:223'], at['FE:267'], at['CHA:267']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:258'], at['FE:268'], at['CHA:268']), mean=1.63, stdev=0.1)) # Set bond angles for other iron coordinating HIS residues rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:51'], at['FE:259'], at['CHA:259']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:108'], at['FE:260'], at['CHA:260']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:26'], at['FE:261'], at['CHA:261']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:94'], at['FE:262'], at['CHA:262']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:93'], at['FE:263'], at['CHA:263']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:203'], at['FE:264'], at['CHA:264']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:141'], at['FE:265'], at['CHA:265']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:189'], at['FE:267'], at['CHA:267']), mean=1.63, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['CG:228'], at['FE:268'], at['CHA:268']), mean=1.63, stdev=0.1)) # Restrain heme binding His-Fe-His bond angles rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:12'], at['FE:259'], at['NE2:51']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:45'], at['FE:260'], at['NE2:108']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:81'], at['FE:261'], at['NE2:26']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:105'], at['FE:262'], at['NE2:94']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:128'], at['FE:263'], at['NE2:93']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:154'], at['FE:264'], at['NE2:203']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:178'], at['FE:265'], at['NE2:141']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:223'], at['FE:267'], at['NE2:189']), mean=3.07, stdev=0.1)) rsr.add(forms.gaussian(group=physical.angle, feature=features.angle(at['NE2:258'], at['FE:268'], at['NE2:228']), mean=3.07, stdev=0.1)) env = environ() env.io.hetatm = True # directories for input atom files env.io.atom_files_directory = ['.', '../atom_files'] a = MyModel(env, alnfile = 'alignment.ali', # alignment filename knowns = ('2OZY','MtrAst'), # codes of the templates sequence = 'MtrA', # code of the target assess_methods=(assess.DOPE, assess.GA341)) # To keep the hemes from being moved def select_atoms(self): self.pick_atoms(selection_segment=('1:', '258:'), selection_search='segment', pick_atoms_set=1, res_types='all', atom_types='all', selection_from='all', selection_status='initialize') a.starting_model= 1 # index of the first model a.ending_model = 1 # index of the last model # (determines how many models to calculate) a.make() # do homology modeling --------------------------------------------------------------------------- Many thanks for any help you can provide, and once again apologies for the length of this post. Stephen Hearnshaw [View Less]

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Re: [modeller_usage] Filling in Missing atoms for a docking complex
by Jack Shultz 01 Apr '09

01 Apr '09

On Wed, Apr 1, 2009 at 10:55 AM, Jack Shultz <jshultz(a)hydrogenathome.org> wrote: > Hello, > > I am new to modeller and I have not gone through the tutorial yet. I > have submitted a couple of FASTA format files to mod web. I am would > like to fix a problem with my docking complexes I get from autodock. > Some of them are missing atoms in a given residue. It was suggested I > either use Deep-View or Modeller to insert missing atoms. Can modeller > indeed achieve … [View More]

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