Tutorial for model free SBiNLab

Background

This is a tutorial for Lau and Kaare in SBiNLab, and hopefully others.

To get inspiration of example scripts files and see how the protocol is performed, have a look here:

nmr-relax-code/test_suite/system_tests/scripts/model_free/dauvergne_protocol.py
nmr-relax-code/auto_analyses/dauvergne_protocol.py

Scripts

To get the protocol to work, we need to

Load a PDB structure
Assign the "data structure" in relax through spin-assignments
Assign necessary "information" as isotope information to each spin-assignment
Read "R1, R2 and NOE" for different magnet field strengths
Calculate some properties
Check the data
Run the protocol

To work most efficiently, it is important to perform each step 1 by 1, and closely inspect the log for any errors.

For similar tutorial, have a look at: Tutorial for model-free analysis sam mahdi

01 - Test load of PDB

First we just want to test to read the PDB file.

01_read_pdb.py

# Python module imports.
from time import asctime, localtime
import os

# relax module imports.
from auto_analyses.dauvergne_protocol import dAuvergne_protocol

# Set up the data pipe.
#######################

# The following sequence of user function calls can be changed as needed.

# Create the data pipe.
bundle_name = "mf (%s)" % asctime(localtime())
name = "origin"
pipe.create(name, 'mf', bundle=bundle_name)

# Load the PDB file.
structure.read_pdb('energy_1.pdb', set_mol_name='ArcCALD', read_model=1)

# Set up the 15N and 1H spins (both backbone and Trp indole sidechains).
structure.load_spins('@N', ave_pos=True)
structure.load_spins('@NE1', ave_pos=True)
structure.load_spins('@H', ave_pos=True)
structure.load_spins('@HE1', ave_pos=True)

# Assign isotopes
spin.isotope('15N', spin_id='@N*')
spin.isotope('1H', spin_id='@H*')

Run with

relax 01_read_pdb.py -t 01_read_pdb.log

Output from logfile

script = '01_read_pdb.py'
----------------------------------------------------------------------------------------------------
# Python module imports.
from time import asctime, localtime
import os

# relax module imports.
from auto_analyses.dauvergne_protocol import dAuvergne_protocol

# Set up the data pipe.
#######################

# The following sequence of user function calls can be changed as needed.

# Create the data pipe.
bundle_name = "mf (%s)" % asctime(localtime())
name = "origin"
pipe.create(name, 'mf', bundle=bundle_name)

# Load the PDB file.
structure.read_pdb('energy_1.pdb', set_mol_name='ArcCALD', read_model=1)

# Set up the 15N and 1H spins (both backbone and Trp indole sidechains).
structure.load_spins('@N', ave_pos=True)
structure.load_spins('@NE1', ave_pos=True)
structure.load_spins('@H', ave_pos=True)
structure.load_spins('@HE1', ave_pos=True)

# Assign isotopes
spin.isotope('15N', spin_id='@N*')
spin.isotope('1H', spin_id='@H*')

----------------------------------------------------------------------------------------------------

relax> pipe.create(pipe_name='origin', pipe_type='mf', bundle='mf (Fri Oct 13 17:44:18 2017)')

relax> structure.read_pdb(file='energy_1.pdb', dir=None, read_mol=None, set_mol_name='ArcCALD', read_model=1, set_model_num=None, alt_loc=None, verbosity=1, merge=False)

Internal relax PDB parser.
Opening the file 'energy_1.pdb' for reading.
RelaxWarning: Cannot determine the element associated with atom 'X'.
RelaxWarning: Cannot determine the element associated with atom 'Z'.
RelaxWarning: Cannot determine the element associated with atom 'OO'.
RelaxWarning: Cannot determine the element associated with atom 'OO2'.
Adding molecule 'ArcCALD' to model 1 (from the original molecule number 1 of model 1).

relax> structure.load_spins(spin_id='@N', from_mols=None, mol_name_target=None, ave_pos=True, spin_num=True)
Adding the following spins to the relax data store.

# mol_name    res_num    res_name    spin_num    spin_name    
REMOVED FROM DISPLAY

relax> structure.load_spins(spin_id='@NE1', from_mols=None, mol_name_target=None, ave_pos=True, spin_num=True)
Adding the following spins to the relax data store.

# mol_name    res_num    res_name    spin_num    spin_name    
REMOVED FROM DISPLAY

relax> structure.load_spins(spin_id='@H', from_mols=None, mol_name_target=None, ave_pos=True, spin_num=True)
Adding the following spins to the relax data store.

# mol_name    res_num    res_name    spin_num    spin_name    
REMOVED FROM DISPLAY

relax> structure.load_spins(spin_id='@HE1', from_mols=None, mol_name_target=None, ave_pos=True, spin_num=True)
Adding the following spins to the relax data store.

# mol_name    res_num    res_name    spin_num    spin_name    
REMOVED FROM DISPLAY

relax> spin.isotope(isotope='15N', spin_id='@N*', force=False)

relax> spin.isotope(isotope='1H', spin_id='@H*', force=False)

02 - Test load of data

That looked to go fine, so let us try to just load data.

02_read_data.py

# Python module imports.
from time import asctime, localtime
import os

# relax module imports.
from auto_analyses.dauvergne_protocol import dAuvergne_protocol

# Set up the data pipe.
#######################

# The following sequence of user function calls can be changed as needed.

# Create the data pipe.
bundle_name = "mf (%s)" % asctime(localtime())
name = "origin"
pipe.create(name, 'mf', bundle=bundle_name)

# Load the PDB file.
structure.read_pdb('energy_1.pdb', set_mol_name='ArcCALD', read_model=1)

# Set up the 15N and 1H spins (both backbone and Trp indole sidechains).
structure.load_spins('@N', ave_pos=True)
structure.load_spins('@NE1', ave_pos=True)
structure.load_spins('@H', ave_pos=True)
structure.load_spins('@HE1', ave_pos=True)

# Assign isotopes
spin.isotope('15N', spin_id='@N*')
spin.isotope('1H', spin_id='@H*')

# Load the relaxation data.
relax_data.read(ri_id='R1_600',  ri_type='R1',  frq=600.17*1e6, file='R1_600MHz_new_model_free.dat',  mol_name_col=1, res_num_col=2, res_name_col=3, spin_num_col=4, spin_name_col=5, data_col=6, error_col=7)
relax_data.read(ri_id='R2_600',  ri_type='R2',  frq=600.17*1e6, file='R2_600MHz_new_model_free.dat',  mol_name_col=1, res_num_col=2, res_name_col=3, spin_num_col=4, spin_name_col=5, data_col=6, error_col=7)
relax_data.read(ri_id='NOE_600',  ri_type='NOE',  frq=600.17*1e6, file='NOE_600MHz_new.dat',  mol_name_col=1, res_num_col=2, res_name_col=3, spin_num_col=4, spin_name_col=5, data_col=6, error_col=7)
relax_data.read(ri_id='R1_750',  ri_type='R1',  frq=750.06*1e6, file='R1_750MHz_model_free.dat',  mol_name_col=1, res_num_col=2, res_name_col=3, spin_num_col=4, spin_name_col=5, data_col=6, error_col=7)
relax_data.read(ri_id='R2_750',  ri_type='R2',  frq=750.06*1e6, file='R2_750MHz_model_free.dat',  mol_name_col=1, res_num_col=2, res_name_col=3, spin_num_col=4, spin_name_col=5, data_col=6, error_col=7)
relax_data.read(ri_id='NOE_750', ri_type='NOE', frq=750.06*1e6, file='NOE_750MHz.dat', mol_name_col=1, res_num_col=2, res_name_col=3, spin_num_col=4, spin_name_col=5, data_col=6, error_col=7)

# Define the magnetic dipole-dipole relaxation interaction.
interatom.define(spin_id1='@N', spin_id2='@H', direct_bond=True)
interatom.define(spin_id1='@NE1', spin_id2='@HE1', direct_bond=True)
interatom.set_dist(spin_id1='@N*', spin_id2='@H*', ave_dist=1.02 * 1e-10)
interatom.unit_vectors()

# Define the chemical shift relaxation interaction.
value.set(-172 * 1e-6, 'csa', spin_id='@N*')