Asymmetric Unit: Difference between revisions
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* <scene name='Asymmetric_Unit/Asymmetric_unit/1'>Asymmetric Unit</scene>. | * <scene name='Asymmetric_Unit/Asymmetric_unit/1'>Asymmetric Unit</scene>. | ||
* <scene name='Asymmetric_Unit/Biological_unit/1'>Biological Unit</scene> (obtained from the [http://pqs.ebi.ac.uk Probable Quaternary Structure server at the European Bioinformatics Institute]). In the case of [[2qcb]], it is a homotetramer of the asymmetric unit. | * <scene name='Asymmetric_Unit/Biological_unit/1'>Biological Unit</scene> (obtained from the [http://pqs.ebi.ac.uk Probable Quaternary Structure server at the European Bioinformatics Institute]). In the case of [[2qcb]], it is a homotetramer of the asymmetric unit. | ||
* <scene name='Asymmetric_Unit/Unit_cell/ | * <scene name='Asymmetric_Unit/Unit_cell/5'>Unit Cell</scene>. In the case of [[2qcb]], the unit cell contains portions of 16 copies of the asymmetric unit. | ||
The '''asymmetric unit''' is the smallest portion of a crystal that, when duplicated and moved by crystal symmetry operations, can produce the unit cell of the crystal. The symmetry operations that are common for biological molecules are rotation, translation, and screw operations (which combine rotation and translation). Mirror symmetry planes occur rarely in crystals of biological molecules due to the presence of chiral centers, e.g. L or D amino acids. | The '''asymmetric unit''' is the smallest portion of a crystal that, when duplicated and moved by crystal symmetry operations, can produce the unit cell of the crystal. The symmetry operations that are common for biological molecules are rotation, translation, and screw operations (which combine rotation and translation). Mirror symmetry planes occur rarely in crystals of biological molecules due to the presence of chiral centers, e.g. L or D amino acids. | ||
