ExPASy-PeptideMass

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Swiss-Prot

Proteomics tools

Hosted by NCSC US

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Please note that:

the amino acid sequence should be entered using one-letter-code.
if you wish to specify a posttranslational modification known to occur on your sequence, insert its standard abbreviation, surrounded by parentheses, after the residue where it occurs.
all whitespace, and all characters different from letters and parentheses are ignored.

Example:

DMAAAMKAVT(ACET)EQGHELSNEERNLLSVAYKNVVGARRSSW
EILNS(PHOS)PEKACSLAKTAFDEAIAELDTLNEE

describes an acetylation of the Threonine (T) at position 10, and a phosphorylation of the Serine (S) at position 44.