Data Category struct_biol
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General 
- Category name
- struct_biol
- Required in PDB entries
- No
- Category group membership
- struct_group
- Used in current PDB entries
- Yes, in about 44.5 % of entries
Category Relationship Diagrams 
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Category Description
Additional Descriptive Information for Depositors
Describe the construction of the biological unit(s) in the space below.The asymmetric unit of a crystal structure may contain several biological units or its biomolecules may need assembly by symmetry operation(s) to produce the biological unit.
If symmetry operation(s) are needed to build the biol. unit, include translation and rotation.
Category Example
loop_
_struct_biol.id
_struct_biol.details
1
; significant deviations from twofold symmetry exist in this dimeric
enzyme
;
2
; The drug binds to this enzyme in two roughly twofold symmetric modes.
Hence this biological unit (2) is roughly twofold symmetric to biological
unit (3). Disorder in the protein chain indicated with alternative
id 1 should be used with this biological unit.
;
3
; The drug binds to this enzyme in two roughly twofold symmetric modes.
Hence this biological unit (3) is roughly twofold symmetric to biological
unit (2). Disorder in the protein chain indicated with alternative
id 2 should be used with this biological unit.
;
Additional Category Example for Depositors
In a structure of a lysozyme-FAB structure, the light and heavy chain components of the FAB could be one biological unit, while the two chains of the FAB and the lysozyme could constitute a second biological unit.
