Atomic naming in PDB consists of 4 character field: atomic symbol (2 char), remoteness indicator (1 char), branch designator (1 char).
Remoteness indcator uses Greek letter distance abbreviation. In order of increasing distance, these are A for alpha, B for beta, G for gamma, D for delta, E for epsilon, Z for zeta, and H for eta.
Branch designator: digit designating the branch direction; left blank if the sidechain is unbranched.
Color scheme: Red=Oxygen; Gray=Carbon; Blue=Nitrogen; Cyan=Hydrogen; Yellow=Sulphur
Arginine
| AA | R |
| Code | Arg |
| Fullname | Arginine |
| Side chain type | basic |
| Mass | 174.2 |
| pI | 10.76 |
| pK1(a-COOH) | 1.82 |
| pK2(a-+NH3) | 8.99 |
| pKr (R) | 12.48 |
| hydrophobic | - |
| positive | X |
| negative | - |
| polar | X |
| charged | X |
| small | - |
| tiny | - |
| aromatic | - |
| aliphatic | - |
| van der Waals volume | 148 |
| Remarks
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