the differences between the quaternary structures of the glu-239 -- -- gln and t-form enzymes can be described as follows : the separation between the catalytic trimers increases by approximately 1.5 a along the threefold axis , and they each rotate in opposite directions approximately 0.5 degree around the threefold axis , whereas the regulatory dimers rotate approximately 2 degrees around the twofold axes .
C0061472
glu
C0017797
gln