MetaboMgITC: Generalized ITC data fitting function

Description Usage Arguments Details Value

View source: R/MetaboMgITC.R

Description

Fits an ITC experiment to a Wiseman isotherm(1) to determine thermodynamic statistics. Raw ".itc" formatted data should be read in using "read.itc". Fits the data to a thermodynamic model then prints a graphical summary of the fit.

Usage

1
2
3
4
5
6
7
8
9
MetaboMgITC(
  cell,
  blank,
  Thermodynamic.equation = "Wiseman.isotherm",
  Fit.start = list(H = 2.534, K = 2880),
  Remove.injection = 1,
  Saturation.threshold = FALSE,
  Save.path.and.prefix = FALSE
)

Arguments

cell

Object created by "read.itc" for the ITC run containing the macromolecule.

blank

Object created by "read.itc" for the ITC run containing the ligand tirated into buffer.

Thermodynamic.equation

The thermodynamic model that you want to fit the data to. Default = "wiseman.isotherm".

Fit.start

Starting parameters for the non-linear regression. Default = = list(H = 2.534, K = 2880).

Remove.injection

Injections you want to remove from subsequent analysis. Default = 1 is the standard for ITC experiments. More than one injection can be supplied in a vector.

Saturation.threshold

For low c value ITC experiments fit to Wiseman isotherms, macomolecule saturation ranging from 70% to 90% produce the same answers. Thus, sometimes it is desirable to standardize the saturation threshold between experiments to minimize degredation of a ligand or macromolecule (for example with ATP binding Mg). Default = FALSE. If set to 0.8, this function will only fit data required to reach 80% macromolecule saturation.

Details

(1) Turnbull, W. B.; Daranas, A. H. On the Value of c: Can Low Affinity Systems Be Studied by Isothermal Titration Calorimetry? Journal of the American Chemical Society 2003, 125 (48), 14859–14866. https://doi.org/10.1021/ja036166s.

Value

A list containing summary statistics for the fit and a graphical depiction of the fits, the raw ITC curve, and the summary statistics.


JPSieg/MetaboMgITC documentation built on Dec. 18, 2021, 12:27 a.m.