Protein 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

PROTEIN CALCULATOR

Calculate varied polypeptide data including molecular weight, isoelectric Point, and ultraviolet absorption

http://www.scripps.edu/~cdputnam/protcalc.html

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

Isoelectric Plot & Titration curve

Given a sequence of aminoacids, this program computes and plots the average net charge of the entire peptide, as function of the pH.

http://www.bioinformatics.org/JaMBW//3/1/6/index.html

The Web Bench

The Web Bench is the essential companion to the biologist, bringing informational resources and a collection of tools & calculators to facilitate work at the bench and analysis of biological data.
Check out the full online bench here

Sequence Analysis with GenBeans

Try GenBeans: Best free software for DNA sequence editing!

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