Data Item _em_2d_crystal_entity.space_group_name

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General

Item name: _em_2d_crystal_entity.space_group_name_H-M
Category name: em_2d_crystal_entity
Attribute name: space_group_name_H-M
Required in PDB entries: no
Used in current PDB entries: Yes, in about 0.008 % of entries

Item Description

The 17 plane groups are classified as oblique, rectangular, square, and hexagonal. To describe 2D crystals of biological molecules, the plane groups are expanded to their equivalent noncentrosymmetric space groups. The space group setting is chosen such that the 2D crystal plane corresponds to the 'ab' plane of the space group. . Enumerated space group descriptions include the H-M plane group symbol and plane group class.

Data Type

Data type code: line
Data type detail: char item types / multi-word items ...
Primitive data type code: char
Regular expression: [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*

Controlled Vocabulary

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Allowed Value	Details
C 1 2 1	cm, rectangular
C 2 2 2	c2mm, rectangular
P 1	p1, oblique
P 1 1 2	p2, oblique, 2-fold perpendicular to plane
P 1 2 1	pm, rectangular, 2-fold on b axis
P 1 21 1	pg, rectangular, 2(1)screw on b axis
P 2 2 2	2mm, rectangular
P 21 2 2	p2mg, rectangular
P 21 21 2	p2gg, rectangular
P 3	p3, hexagonal
P 3 1 2	p3m1, hexagonal
P 3 2 1	p31m, hexagonal
P 4	p4, square
P 4 2 2	p4mm, square
P 4 21 2	p4gm, square
P 6	p6, hexagonal
P 6 2 2	p6mm, hexagonal

Controlled Vocabulary at Deposition