PepMapViz (version 1.1.0)

obtain_mod_mzTab: Obtain modification information from Peptide data generated by mzTab

Description

This function takes mzTab output containing a 'modifications' column with PTM information and converts it into a new dataframe with the desired format of peptide sequences and associated PTM information.

Usage

obtain_mod_mzTab(
  data,
  mod_column,
  seq_column,
  PTM_table = NULL,
  PTM_annotation = FALSE,
  PTM_mass_column
)

Value

A data.table with 'PTM_position', 'PTM_type', 'reps', and other columns.

Arguments

data

A data.table with a column containing stripped sequence and a column containing PTM information.

mod_column

The name of the column containing the modified peptide sequences.

seq_column

The name of the column containing peptide sequences for mzTab

PTM_table

A data.table with columns 'PTM_mass' and 'PTM_type' containing PTM annotation information.

PTM_annotation

A logical value indicating whether to include PTM annotation information in the result.

PTM_mass_column

The name of the column containing the PTM mass information

Examples

library(data.table)
data <- data.table(
  sequence = c("DDREDMLVYQAK", "EAAENSLVAYK", "IEAELQDICNDVLELLDK"),
  modifications = c("4-UNIMOD:7,10-UNIMOD:35", NA, "8-UNIMOD:7"),
  Condition1 = c("A", "B", "B"),
  Condition2 = c("C", "C", "D")
)
PTM_table <- data.table(
  PTM_mass = c("UNIMOD:7", "UNIMOD:35"),
  PTM_type = c("Amid", "Ox")
)
mod_column <- "modifications"
seq_column <- "sequence"
converted_data <- obtain_mod_mzTab(
  data,
  mod_column,
  seq_column,
  PTM_table,
  PTM_annotation = TRUE,
  PTM_mass_column = "PTM_mass"
)