Thermodynamic and Evolutionary Coupling between the Native and Amyloid State of Globular Proteins

Cell Rep. 2020 Apr 14;31(2):107512. doi: 10.1016/j.celrep.2020.03.076.

Abstract

The amyloid-like aggregation propensity present in most globular proteins is generally considered to be a secondary side effect resulting from the requirements of protein stability. Here, we demonstrate, however, that mutations in the globular and amyloid state are thermodynamically correlated rather than simply associated. In addition, we show that the standard genetic code couples this structural correlation into a tight evolutionary relationship. We illustrate the extent of this evolutionary entanglement of amyloid propensity and globular protein stability. Suppressing a 600-Ma-conserved amyloidogenic segment in the p53 core domain fold is structurally feasible but requires 7-bp substitutions to concomitantly introduce two aggregation-suppressing and three stabilizing amino acid mutations. We speculate that, rather than being a corollary of protein evolution, it is equally plausible that positive selection for amyloid structure could have been a driver for the emergence of globular protein structure.

Keywords: amyloid; evolution; protein folding; protein stability.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Amyloid / genetics*
  • Amyloid / metabolism*
  • Amyloidogenic Proteins / metabolism*
  • Cell Line
  • Evolution, Molecular
  • Humans
  • Protein Conformation
  • Protein Folding
  • Protein Stability
  • Protein Structure, Secondary
  • Thermodynamics
  • Tumor Suppressor Protein p53 / genetics
  • Tumor Suppressor Protein p53 / metabolism

Substances

  • Amyloid
  • Amyloidogenic Proteins
  • Tumor Suppressor Protein p53