MTRIX THE TRANSFORMATIONS PRESENTED ON MTRIX RECORDS BELOW DESCRIBE NON-CRYSTALLOGRAPHIC RELATIONSHIPS AMONG THE VARIOUS DOMAINS IN THIS ENTRY. APPLYING THE APPROPRIATE MTRIX TRANSFORMATION TO THE RESIDUES LISTED FIRST WILL YIELD APPROXIMATE COORDINATES FOR THE RESIDUES LISTED SECOND. APPLIED TO TRANSFORMED TO MTRIX RESIDUES RESIDUES RMSD M1 B 13 .. B 133 D 13 .. D 133 0.834 NONCRYSTALLOGRAPHIC TWO-FOLD RELATING PROTOMERS OF THE STREPTAVIDIN TETRAMER SYMMETRY THE CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS PRESENTED BELOW GENERATE THE SUBUNITS OF THE POLYMERIC MOLECULE. APPLIED TO RESIDUES: B 13 .. 135 APPLIED TO RESIDUES: D 13 .. 133 APPLIED TO RESIDUES: M 1 .. 6 APPLIED TO RESIDUES: P 1 .. 6 STREPTAVIDIN IS A TETRAMERIC PROTEIN. THE CRYSTALLOGRAPHIC TRANSFORMATION GIVEN HERE GENERATES THE TETRAMER FROM THE DIMER FOUND IN THE ASYMMETRIC UNIT OF THE CRYSTALS. SYMMETRY1 1 1.000000 0.000000 0.000000 0.00000 SYMMETRY2 1 0.000000 -1.000000 0.000000 0.00000 SYMMETRY3 1 0.000000 0.000000 -1.000000 0.00000