Data Item _chem_comp.three_letter_code

General

Item name
_chem_comp.three_letter_code
Category name
chem_comp
Attribute name
three_letter_code
Required in PDB entries
no
Used in currrent PDB entries
No
Used in the Chemical Component dictionary
Yes

Item Description

For standard polymer components, the common three-letter code for the component. Non-standard polymer components and non-polymer components are also assigned three-letter-codes. For ambiguous polymer components three-letter code should be given as 'UNK'. Ambiguous ions are assigned the code 'UNX'. Ambiguous non-polymer components are assigned the code 'UNL'.

Item Examples

37

 ALA
 ARG
 ASN
 ASP
 ASX
 CYS
 GLN
 GLU
 GLY
 GLX
 HIS
 ILE
 LEU
 LYS
 MET
 PHE
 PRO
 SER
 THR
 TRP
 TYR
 VAL
 1MA
 5MC
 OMC
 1MG
 2MG
 M2G
 7MG
 0MG
 H2U
 5MU
 PSU
 ACE
 FOR
 HOH
 UNK

Data Type

Data type code
uchar5
Data type detail
data item for 5 character codes
Primitive data type code
uchar
Regular expression
[+]?[A-Za-z0-9][A-Za-z0-9]?[A-Za-z0-9]?[A-Za-z0-9]?[A-Za-z0-9]?