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).
Please send me an email if you notice an error!
| amino acid |
code |
abbrev |
composition |
mono mass |
avg mass |
| glycine |
G |
GLY |
C2H3NO |
57.021463735 |
57.05132 |
| alanine |
A |
ALA |
C3H5NO |
71.037113805 |
71.0779 |
| serine |
S |
SER |
C3H5NO2 |
87.032028435 |
87.0773 |
| proline |
P |
PRO |
C5H7NO |
97.052763875 |
97.11518 |
| valine |
V |
VAL |
C5H9NO |
99.068413945 |
99.13106 |
| threonine |
T |
THR |
C4H7NO2 |
101.047678505 |
101.10388 |
| cysteine |
C |
CYS |
C3H5NOS |
103.009184505 |
103.1429 |
| leucine |
L |
LEU |
C6H11NO |
113.084064015 |
113.15764 |
| isoleucine |
I |
ILE |
C6H11NO |
113.084064015 |
113.15764 |
| asparagine |
N |
ASN |
C4H6N2O2 |
114.042927470 |
114.10264 |
| aspartic acid |
D |
ASP |
C4H5NO3 |
115.026943065 |
115.0874 |
| glutamine |
Q |
GLN |
C5H8N2O2 |
128.058577540 |
128.12922 |
| lysine |
K |
LYS |
C6H12N2O |
128.094963050 |
128.17228 |
| glutamic acid |
E |
GLU |
C5H7NO3 |
129.042593135 |
129.11398 |
| methionine |
M |
MET |
C5H9NOS |
131.040484645 |
131.19606 |
| histidine |
H |
HIS |
C6H7N3O |
137.058911875 |
137.13928 |
| phenylalanine |
F |
PHE |
C9H9NO |
147.068413945 |
147.17386 |
| selenocysteine |
U |
SEC |
C3H5NOSe |
150.953633405 |
150.3079 |
| arginine |
R |
ARG |
C6H12N4O |
156.101111050 |
156.18568 |
| tyrosine |
Y |
TYR |
C9H9NO2 |
163.063328575 |
163.17326 |
| tryptophan |
W |
TRP |
C11H10N2O |
186.079312980 |
186.2099 |
| pyrrolysine |
O |
PYL |
C12H19N3O2 |
237.147726925 |
237.29816 |
| element | code | mono mass | avg mass |
|---|
| Hydrogen |
H |
1.007825035 |
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 |
| Selenium |
Se |
79.9165196 |
79.96 |
| 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 |
