Sequence summary
| Peptide sequence: | RPKPQQFFGLM |
| Molecular formula: | C63H97N17O14S |
| Molecular weight: | 1347.71 |
| N-terminus: | H (Unmodified) |
| C-terminus: | OH (Acid) |
A ChemDraw structure for your sequence is available
Calculated properties
| Theoretical pI: | 11.51 |
| Estimated ε (280 nm) | |
| All Cys pairs disulfide bonded: | - |
| All Cys residues reduced: | - |
Basic
Acidic
Uncharged
OtherSequence difficulty
A plot of calculated β-strand contiguity for your sequence is given below. This may indicate possible regions where aggregation-related coupling difficulties could occur during your synthesis.
Ion series
Calculated ion series for your peptide are given in the table below. Assignments of MS peaks (if provided) are highlighted.
| +6H+ | +5H+ | +4H+ | +3H+ | +2H+ | +H+ | |
|---|---|---|---|---|---|---|
| [M] | 225.63 | 270.55 | 337.94 | 450.25 | 674.86 | 1348.72 |
| [M - F] | 201.12 | 241.14 | 301.17 | 401.22 | 601.33 | 1201.65 |
| [M - G] | 216.12 | 259.15 | 323.68 | 431.24 | 646.35 | 1291.70 |
| [M - K] | 204.28 | 244.93 | 305.91 | 407.55 | 610.82 | 1220.63 |
| [M - L] | 206.78 | 247.93 | 309.66 | 412.55 | 618.32 | 1235.64 |
| [M - Met] | 203.79 | 244.34 | 305.18 | 406.57 | 609.34 | 1217.68 |
| [M - P] | 209.45 | 251.14 | 313.67 | 417.89 | 626.34 | 1251.67 |
| [M - Q] | 204.28 | 244.94 | 305.92 | 407.56 | 610.83 | 1220.66 |
| [M - R] | 199.61 | 239.33 | 298.91 | 398.21 | 596.81 | 1192.62 |
| [M + O] | 228.29 | 273.75 | 341.93 | 455.58 | 682.86 | 1364.71 |
| [M + Pbf] | 267.79 | 321.15 | 401.19 | 534.58 | 801.36 | 1601.72 |
Peak assignment summary
Peptide Calculator has attempted to assign your MS peaks to singly-charged species. The results are summarized in the table below (a calculated mass is given for each assignment).
| Peak (m/z) | Deletion(s) | Adduct(s) | Losses(s) | Calculated Mass |
|---|---|---|---|---|
| 1201.4 | F | - | - | 1201.65 |
| 1301.7 | K, L, P | Na+, Pbf, O | - | 1301.47 |
| K, 2P | Na+, Pbf | - | 1301.50 | |
| L, P, Q | Na+, Pbf, O | - | 1301.50 | |
| 2P, Q | Na+, Pbf | - | 1301.54 | |
| 1348.1 (M+) | - | - | - | 1348.72 |
| 1601.3 | - | Pbf | - | 1601.72 |