Key result
Mutation of actin Tyr-53 to Ala or Glu substantially reduced affinity for DNase I, increased nucleotide exchange, and inhibited filament elongation and cell growth, whereas the Y53F mutant behaved like endogenous actin.
Tyr or Phe at position 53 is required to maintain the functional conformations of the DNase I-binding loop in both G- and F-actin.
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Tyr-53 integrity shapes actin dynamics in models; leaves open relevance to human cardiac cytoskeletal disease or therapies.
Liu et al. (2010) studied this question. Actin Tyr-53 mutations (Y53F, Y53A, Y53E, Trp, Leu) vs. Endogenous Dictyostelium actin was evaluated on Biochemical properties (affinity for DNase I, nucleotide exchange rate, polymerization) and cell growth/development. Mutation of actin Tyr-53 to Ala or Glu substantially reduced affinity for DNase I, increased nucleotide exchange, and inhibited filament elongation and cell growth, whereas the Y53F mutant behaved like endogenous actin.
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