Compensatory evolution of a WW domain variant lacking the strictly conserved Trp residue.

Abstract excerpt

Replacement of conserved amino acid residues during evolution of proteins can lead to divergence and the formation of new families with novel functions, but is often deleterious to both protein structure and function. Using the WW domain, we experimentally examined whether and to what degree second-site mutations can compensate for the reduction of function and loss of structure that accompany substitution of a...

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