Data Category struct_ref
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General 
- Category name
- struct_ref
- Required in PDB entries
- no
- Category group membership
- struct_group
- Used in current PDB entries
- Yes, in about 99.2 % of entries
Category Relationship Diagrams 
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View abbreviated category relationship diagram including only those categories used in current PDB entries.
Category Description
Data items in the STRUCT_REF category allow the author of a
data block to relate the entities or biological units
described in the data block to information archived in external
databases.
For references to the sequence of a polymer, the value of
the data item _struct_ref.seq_align is used to indicate
whether the correspondence between the sequence of the entity
or biological unit in the data block and the sequence in the
referenced database entry is 'complete' or 'partial'. If
this value is 'partial', the region (or regions) of the
alignment may be delimited using data items in the
STRUCT_REF_SEQ category.
Similarly, the value of _struct_ref.seq_dif is used to indicate
whether the two sequences contain point differences. If the
value is 'yes', the differences may be identified and annotated
using data items in the STRUCT_REF_SEQ_DIF category.
Category Example
loop_
_struct_ref.id
_struct_ref.entity_id
_struct_ref.biol_id
_struct_ref.db_name
_struct_ref.db_code
_struct_ref.seq_align
_struct_ref.seq_dif
_struct_ref.details
1 1 . 'Genbank' '12345' 'entire' 'yes' .
2 . 2 'PDB' '1ABC' . .
; The structure of the closely related compound,
isobutyryl-pepstatin (pepstatin A) in complex with
rhizopuspepsin
;
Key Data Items 
Category Data Items
- _struct_ref.id
- _struct_ref.biol_id
- _struct_ref.db_code
- _struct_ref.db_name
- _struct_ref.details
- _struct_ref.entity_id
- _struct_ref.pdbx_align_begin
- _struct_ref.pdbx_align_end
- _struct_ref.pdbx_db_accession
- _struct_ref.pdbx_db_isoform
- _struct_ref.pdbx_seq_one_letter_code
- _struct_ref.seq_align
- _struct_ref.seq_dif