A python library for the Bayesian analysis of isothermal titration calorimetry experiments. This library is currently under heavy development, and API changes are frequent. Not all of the available command line options have been implemented yet.
scripts/bayesitc_integrate.py, a command line utility that integrates data from .itc files using Gaussian process regression.scripts/bayesitc_mcmc.py, a command line utility to run MCMC using one of two available models.bayesitc/- the library with underlying tools.scripts/bayesitc_util.py, a deprecated command line utility that can be used to both integrate, and analyze data
Python2.7+, python3.4+ . We recommend using Anaconda as your python distribution. Some of the requirements will need to be installed using pip.
numpy
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pymc
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docopt
schema
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The bayesitc_integrate.py script can integrate the data from .itc files using Gaussian process regression. Below are the options that the program accepts.
Integrate ITC data using Gaussian process regression. Uses MicroCal .itc files, or custom format .yml files for analysing experiments.
Usage:
bayesitc_integrate.py <datafiles>... [-w <workdir> | --workdir=<workdir>] [-v | -vv | -vvv] [options]
bayesitc_integrate.py (-h | --help)
bayesitc_integrate.py --license
bayesitc_integrate.py --version
Options:
-h, --help Show this screen
--version Show version
--license Show license
-l <logfile>, --log=<logfile> File to write logs to. Will be placed in workdir.
-v, Verbose output level. Multiple flags increase verbosity.
<datafiles> Datafile(s) to perform the analysis on, .itc, .yml
-w <workdir>, --workdir=<workdir> Directory for output files [default: ./]
-n <name>, --name=<name> Name for the experiment. Will be used for output files. Defaults to input file name-integrated.dat.
-i <ins>, --instrument=<ins> The name of the instrument used for the experiment. Overrides .itc file instrument.
-f <frac>, --fraction=<frac> The fraction of the injection to fit, measured from the end [default: 0.2]
--theta0=<theta0> The parameters in the autocorrelation model. [default: 5.0]
--nugget=<nugget> Size of nugget effect to allow smooth predictions from noisy data. [default: 1.0]
--plot Generate plots of the baseline fit
Sample files have been included to test if the library is functional. You can find them under bayesitc/testdata.
This example command shows how to integrate a .itc file using default settings
bayesitc_integrate.py bayesitc/testdata/sample.itc -w workdir -v
.
The bayesitc_mcmc.py script runs Markov chain Monte Carlo (MCMC) on the supplied data, using a predefined model.
Below are the options that the program accepts.
Analyze ITC data using Markov chain Monte Carlo (MCMC). Uses MicroCal .itc files, or custom format .yml files for modeling experiments.
When running the program, you can select one of two options:
competitive
A competitive binding model. Requires multiple experiments to be specified.
twocomponent
A twocomponent binding model. Analyzes only a single experiment
Usage:
bayesitc_mcmc.py twocomponent <datafile> <heatsfile> [-v | -vv | -vvv] [options]
bayesitc_mcmc.py competitive (<datafile> <heatsfile>)... (-r <receptor> | --receptor <receptor>) [-v | -vv | -vvv] [options]
bayesitc_mcmc.py (-h | --help)
bayesitc_mcmc.py --license
bayesitc_mcmc.py --version
Options:
-h, --help Show this screen
--version Show version
--license Show license
-l <logfile>, --log=<logfile> File to write logs to. Will be placed in workdir.
-v, Verbose output level. Multiple flags increase verbosity.
-w <workdir>, --workdir <workdir> Directory for output files [default: ./]
-r <receptor> | --receptor <receptor> The name of the receptor for a competitive binding model.
-n <name>, --name <name> Name for the experiment. Will be used for output files. Defaults to inputfile name.
-i <ins>, --instrument <ins> The name of the instrument used for the experiment. Overrides .itc file instrument.
--nfit=<n> No. of iteration for maximum a posteriori fit [default: 20000]
--niters=<n> No. of iterations for mcmc sampling [default: 2000000]
--nburn=<n> No. of Burn-in iterations for mcmc sampling [default: 500000]
--nthin=<n> Thinning period for mcmc sampling [default: 500]
Sample files have been included to test if the library is functional. You can find them under bayesitc/testdata.
For example, here is how to run MCMC on an experiment using a two-component binding model:
python .\scripts\bayesitc_mcmc.py twocomponent bayesitc/testdata/sample.itc bayesitc/testdata/sample-integrated.dat
Below are some examples of using the old bayesitc_util.py script.
An example for a two-component binding model
bayesitc_util.py mcmc bayesitc/testdata/sample.itc -w workdir -v -m TwoComponent --niters=20000 --nburn=1000 --nthin=10 --nfit=100
Analyze .itc files without mcmc
bayesitc_util.py bayesitc/testdata/sample.itc bayesitc/testdata/sample2.itc -w workdir
An example for a competitive binding model.
bayesitc_util.py mcmc bayesitc/testdata/acetyl_pepstatin.yml testdata/kni10033.yml bayesitc/testdata/kni10075.yml -w workdir -v -m Competitive -r "HIV protease" --niters=20000 --nburn=1000 --nthin=10 --nfit=100
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