seqinr (version 1.0-4)

AAstat: To Get Some Protein Statistics

Description

cd It gives simple protein sequence information including the number of residues, the percentage of each physico-chemical class of amino acid and the theoretical isoelectric point.

Usage

AAstat(seq, plot = TRUE)

Arguments

seq

a protein sequence as a vector of chars

plot

if TRUE, it plots a histogram of the presence of residues with the physico-chemical properties: Tiny, Small, Aliphatic, Aromatic, Non-polar, Polar, Charged, Positive, Negative

Value

• If plot is TRUE, it draws the histogram as described with the top. It returns a list with the following components:
• Compo
  A factor giving the number of each residues.
• Prop
  A list giving the percentage of each physico-chemical class of amino acid.
• Pi
  The theoretical isoelectric point

References

citation("seqinr")

See Also

computePI, SEQINR.UTIL, SeqFastaAA

Examples

ss = read.fasta(File=system.file("sequences/seqAA.fasta",package = "seqinr"),seqtype="AA")
  AAstat(ss[[1]])