Create Wenxiang diagrams to visualize alpha helical sequences.

Source: R/draw_wenxiang.R

This function visualizes alpha-helical peptides as Wenxiang diagrams. Sequences between 2 and 18 (inclusive) characters can be visualized. The residue closest to the center represents the amino acid at the N-terminus (first in `sequence`).

draw_wenxiang(sequence, col = c("grey", "yellow", "blue", "red"),
  labels = FALSE, label.col = "black", fixed = TRUE,
  legend = FALSE)

Arguments

sequence

character vector containing amino acid sequence from N-terminus to C-terminus
col

colors for each amino acid type in the following order: nonpolar residues, polar residues, basic residues, acidic residues
labels

logical value; if TRUE, one-letter residue codes are overlaid on the residue circles
label.col

character value for color of labels added if `labels = TRUE`
fixed

if TRUE (default), ensures that residues will be circles (not ellipses) even if graphics device is rectangular
legend

if TRUE, adds legend to plot

Examples

draw_wenxiang("GIGAVLKVLTTGLPALIS")
draw_wenxiang("QQRKRKIWSILAPLGTTL")