Stability and crystal structures of His88 mutant human transthyretins

Takeshi Yokoyama, Yuma Hanawa, Takayuki Obita, Mineyuki Mizuguchi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Destabilization of human transthyretin (TTR) has been implicated in its misfolding and aggregation. A previous study on the neutron crystal structure of TTR suggested that a large hydrogen bond network around H88 which includes water molecules is significantly involved in the stability of wild-type TTR (WT-TTR). Here, we demonstrate that the H88R mutant associated with amyloid cardiomyopathy is substantially destabilized compared with WT-TTR. In order to clarify the role of H88 and the hydrogen bond network in the stability of TTR, we determined the thermodynamic stability and the crystal structure of H88 mutants (H88A, H88F, H88Y, and H88S). Our results suggest that in some cases TTR is destabilized due to alterations in bound water molecules as well as structural changes in TTR itself.

Original languageEnglish
Pages (from-to)1862-1871
Number of pages10
JournalFEBS Letters
Volume591
Issue number13
DOIs
StatePublished - 2017/07/01

Keywords

  • amyloidosis
  • crystal structure
  • hydrogen bond network
  • protein stability
  • transthyretin

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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