scaledHydropathyGlobal {idpr} | R Documentation

## Protein Scaled Hydropathy Calculations

### Description

This is used to calculate the scaled hydropathy of an amino acid sequence for each residue in the sequence. The output is either a data frame or graph showing the matched scores for each residue along the sequence.

### Usage

    scaledHydropathyGlobal(sequence, plotResults = FALSE, proteinName = NA, ...)

### Arguments

`sequence` | amino acid sequence as a single character string, a vector of single characters, or an AAString object. It also supports a single character string that specifies the path to a .fasta or .fa file.
`plotResults` | logical value, FALSE by default. If `plotResults = TRUE` a plot will be the output. If `plotResults = FALSE` the output is a data frame for each residue.
`proteinName` | character string with length = 1. optional setting to include the name in the plot title.
`...` | any additional parameters, especially those for plotting.

### Value

if `plotResults = TRUE`, a graphical representation data. Average is shown by the horizontal line. If `plotResults = FALSE`, a data frame is reported with each amino acid and each residue value shown. Score for each residue shown in the column "Hydropathy".

### Plot Colors

For users who wish to keep a common aesthetic, the following colors are used when plotResults = TRUE.

- Dynamic line colors:

  - Close to 0 = "skyblue3" or "#6CA6CD"

  - Close to 1 = "chocolate1" or "#FF7F24"

  - Close to midpoint = "grey65" or "#A6A6A6"

### References

Kyte, J., & Doolittle, R. F. (1982). A simple method for displaying the hydropathic character of a protein. Journal of molecular biology, 157(1), 105-132.

### See Also

`KDNorm` for residue values.

Other scaled hydropathy functions: `KDNorm`, `meanScaledHydropathy()`, `scaledHydropathyLocal()`

### Examples

    #Amino acid sequences can be character strings
    aaString <- "ACDEFGHIKLMNPQRSTVWY"
    #Amino acid sequences can also be character vectors
    aaVector <- c("A", "C", "D", "E", "F",
                  "G", "H", "I", "K", "L",
                  "M", "N", "P", "Q", "R",
                  "S", "T", "V", "W", "Y")
    #Alternatively, .fasta files can also be used by providing
    ##The path to the file as a character string

    exampleDF <- scaledHydropathyGlobal(aaString,
                                        plotResults = FALSE)
    head(exampleDF)

    exampleDF <- scaledHydropathyGlobal(aaVector,
                                        plotResults = FALSE)
    head(exampleDF)

    #plotResults = TRUE will output a ggplot
      scaledHydropathyGlobal(aaString,
                             plotResults = TRUE)

      #since it is a ggplot, you can change or annotate the plot
      gg <- scaledHydropathyGlobal(aaVector,
                                   plotResults = TRUE)
      gg <- gg + ggplot2::ylab("Local Hydropathy")
      gg <- gg + ggplot2::geom_text(data = exampleDF,
                                    ggplot2::aes(label = AA,
                                                 y = Hydropathy + 0.1))
      plot(gg)

[Package idpr version 1.0.007 Index]