Protein pI & MW
Compute pI/Mw
Compute the theoretical isoelectric point (pI) and molecular weight (Mw) from a UniProt Knowledgebase entry or for a user sequence
http://www.expasy.ch/tools/pi_tool.html
Isoelectric Point Service
Isoelectric Point determination
http://www.embl-heidelberg.de/cgi/pi-wrapper.pl
TagIdent
Identify proteins with isoelectric point (pI), molecular weight (Mw) and sequence tag, or generate a list of proteins close to a given pI and Mw
http://www.expasy.ch/tools/tagident.html
PeptideMass
Calculate masses of peptides and their post-translational modifications for a UniProtKB/Swiss-Prot or UniProtKB/TrEMBL entry or for a user sequence
http://www.expasy.ch/tools/peptide-mass.html
ScanSite pI/Mw
Compute the theoretical pI and Mw, and multiple phosphorylation states
http://scansite.mit.edu/calc_mw_pi.html
MW, pI, Titration curve
Computes pI, composition and allows to see a titration curve
http://www.iut-arles.up.univ-mrs.fr/w3bb/d_abim/compo-p.html