Inverse thinking about double mutants of enzymes.

Abstract excerpt

The quantitative effect of a second damaging mutation on a mutated enzyme may be additive, partially additive, synergistic, antagonistic, or absent, in the double mutant. Each of these five possible types of interactions has its own mechanistic explanation [Mildvan, A. S., Weber, D. J., and Kuliopulos, A. (1992) Arch. Biochem. Biophys. 294, 327-340]. Additive effects indicate independent functioning of the two...

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