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The structural basis for allosteric regulation of porphobilinogen synthase (PBGS) is modulation of a quaternary structure equilibrium between octamer and hexamer (via dimers), which is represented schematically as 8mer ⇔ 2mer ⇔ 2mer∗ ⇔ 6mer∗. The “∗” represents a reorientation between two domains of each subunit that occurs in the dissociated state because it is sterically forbidden in the larger...
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