Peptides (version 1.0.4)

mw: Compute the molecular weight of a protein sequence

Description

This function calculates the molecular weight of a protein sequence. It is calculated as the sum of the mass of each amino acid using the scale available on Compute pI/Mw tool.

Usage

mw(seq)

Arguments

seq

amino acid sequence string

source

The formula and amino acid scale are the same available on ExPASy Compute pI/Mw tool http://web.expasy.org/

References

Gasteiger, E., Hoogland, C., Gattiker, A., Wilkins, M. R., Appel, R. D., & Bairoch, A. (2005). Protein identification and analysis tools on the ExPASy server. In The proteomics protocols handbook (pp. 571-607). Humana Press. Chicago

Examples

# COMPARED TO ExPASy Compute pI/Mw tool
# http://web.expasy.org/compute_pi/
# SEQUENCE: QWGRRCCGWGPGRRYCVRWC 
# Theoretical pI/Mw: 9.88 / 2485.91 
  
mw("QWGRRCCGWGPGRRYCVRWC")
# [1] 2485.911