Here's the set of monoisotopic and average amino masses and elemental mass values we use in our tools developed here. The amino acid masses are based on the sum of the elemental masses where the elemental masses are from Unimod. You can also download this spreadsheet where the average and monoisotopic masses for each amino acid are calculated within the spreadsheet from the listed elemental values (that you can change). Structure images are from Wikipedia or Wikimedia.
amino acid | code | composition | mono mass | avg mass | structure |
---|---|---|---|---|---|
glycine | G | C2H3NO | 57.021463735 | 57.05132 | |
alanine | A | C3H5NO | 71.037113805 | 71.0779 | |
serine | S | C3H5NO2 | 87.032028435 | 87.0773 | |
proline | P | C5H7NO | 97.052763875 | 97.11518 | |
valine | V | C5H9NO | 99.068413945 | 99.13106 | |
threonine | T | C4H7NO2 | 101.047678505 | 101.10388 | |
cysteine | C | C3H5NOS | 103.009184505 | 103.1429 | |
leucine | L | C6H11NO | 113.084064015 | 113.15764 | |
isoleucine | I | C6H11NO | 113.084064015 | 113.15764 | |
asparagine | N | C4H6N2O2 | 114.042927470 | 114.10264 | |
aspartic acid | D | C4H5NO3 | 115.026943065 | 115.0874 | |
glutamine | Q | C5H8N2O2 | 128.058577540 | 128.12922 | |
lysine | K | C6H12N2O | 128.094963050 | 128.17228 | |
glutamic acid | E | C5H7NO3 | 129.044593135 | 129.11398 | |
pyrrolysine | O | C12H19N3O2 | 237.147726925 | 237.29816 | |
methionine | M | C5H9NOS | 131.040484645 | 131.19606 | |
histidine | H | C6H7N3O | 137.058911875 | 137.13928 | |
phenylalanine | F | C9H9NO | 147.068413945 | 147.17386 | |
selenocysteine | U | C3H5NOSe | 150.953633405 | 150.3079 | |
arginine | R | C6H12N4O | 156.101111050 | 156.18568 | |
tyrosine | Y | C9H9NO2 | 163.063328575 | 163.17326 | |
tryptophan | W | C11H10N2O | 186.079312980 | 186.2099 |
element | code | mono mass | avg mass |
---|---|---|---|
hydrogen | h | 1.007845035 | 1.00794 |
carbon | c | 12.0000000 | 12.0107 |
nitrogen | n | 14.003074 | 14.0067 |
oxygen | o | 15.99491463 | 15.9994 |
phosphorus | p | 30.973762 | 30.973761 |
sulphur | s | 31.9720707 | 32.065 |
proton | 1.00727646688 |
modification | residues | mono mass | avg mass | composition |
---|---|---|---|---|
phosphorylation | STY | 79.966331 | 79.9799 | HO3P |
oxidation | M | 15.994915 | 15.9994 | O |
acetylation | K | 42.010565 | 42.0367 | H2C2O |
carbamidomethyl | C | 57.021464 | 57.0513 | H3C2NO |