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The glycerophosphodiester phosphodiesterase (GDPD)‐like SMaseD/PLD domain family, which includes phospholipase D (PLD) toxins in recluse spiders and actinobacteria, evolved anciently in bacteria from the GDPD. The PLD enzymes retained the core (β/α)8 barrel fold of GDPD, while gaining a signature C‐terminal expansion motif and losing a small insertion domain. Using sequence alignments and phylogenetic...
New protein folds may evolve from existing folds through metamorphic evolution involving a dramatic switch in structure. To mimic pathways by which amino acid sequence changes could induce a change in fold, we designed two folded hybrids of Xfaso 1 and Pfl 6, a pair of homologous Cro protein sequences with ~40% identity but different folds (all‐α vs. α + β, respectively). Each hybrid, XPH1 or XPH2,...
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