Note that there will be a change to what are considered standard groups due to the adoption of the new PDB Het Group Dictionary. Only the twenty common amino acids and five nucleic acids plus inosine will be treated as "standard" with all others being treated as modified residues to be described by MODRES records.
No distinction is made between ribo- and deoxyribonucleotides in the SEQRES records. These residues are identified with the same residue name (i.e., A, C, G, T, U, I).
RESIDUE ABBREVIATION SYNONYM ----------------------------------------------------------------------------- Alanine ALA A Arginine ARG R Asparagine ASN N Aspartic acid ASP D ASP/ASN ambiguous ASX B Cysteine CYS C Glutamine GLN Q Glutamic acid GLU E GLU/GLN ambiguous GLX Z Glycine GLY G Histidine HIS H Isoleucine ILE I Leucine LEU L Lysine LYS K Methionine MET M Phenylalanine PHE F Proline PRO P Serine SER S Threonine THR T Tryptophan TRP W Tyrosine TYR Y Unknown UNK Valine VAL V
RESIDUE ABBREVIATION ----------------------------------------------------------------------- Adenosine A Modified adenosine +A Cytidine C Modified cytidine +C Guanosine G Modified guanosine +G Inosine I Modified inosine +I Thymidine T Modified thymidine +T Uridine U Modified uridine +U Unknown UNK
Remarks 103 and 104 are included when an entry contains inosine.
These weights and formulas correspond to the unpolymerized state of the component. The atoms of one water molecule are eliminated for each two components joined.
NAME CODE FORMULA MOL. WT. ----------------------------------------------------------------------------- Alanine ALA C3 H7 N1 O2 89.09 Arginine ARG C6 H14 N4 O2 174.20 Asparagine ASN C4 H8 N2 O3 132.12 Aspartic acid ASP C4 H7 N1 O4 133.10 ASP/ASN ambiguous ASX C4 H71/2 N11/2 O31/2 132.61 Cysteine CYS C3 H7 N1 O2 S1 121.15 Glutamine GLN C5 H10 N2 O3 146.15 Glutamic acid GLU C5 H9 N1 O4 147.13 GLU/GLN ambiguous GLX C5 H91/2 N11/2 O31/2 146.64 Glycine GLY C2 H5 N1 O2 75.07 Histidine HIS C6 H9 N3 O2 155.16 Isoleucine ILE C6 H13 N1 O2 131.17 Leucine LEU C6 H13 N1 O2 131.17 Lysine LYS C6 H14 N2 O2 146.19 Methionine MET C5 H11 N1 O2 S1 149.21 Phenylalanine PHE C9 H11 N1 O2 165.19 Proline PRO C5 H9 N1 O2 115.13 Serine SER C3 H7 N1 O3 105.09 Threonine THR C4 H9 N1 O3 119.12 Tryptophan TRP C11 H12 N2 O2 204.23 Tyrosine TYR C9 H11 N1 O3 181.19 Valine VAL C5 H11 N1 O2 117.15 Undetermined UNK C5 H6 N1 O3 128.16