Molecular dynamics studies on the thermostability of family 11 xylanases

M. Purmonen, Jarkko Valjakka, Kristiina Takkinen, T. Laitinen, Juha Rouvinen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

82 Citations (Scopus)

Abstract

Twelve members of the family 11 xylanases, including both mesophilic and thermophilic proteins, were studied using molecular dynamics (MD). Simulations of xylanases were carried out in an explicit water environment at four different temperatures, 300, 400, 500 and 600 K. A difference in thermotolerance between mesophilic and thermophilic xylanases became clear: thermophilic xylanases endured heat in higher simulation temperatures better than mesophilic ones. The unfolding pathways seemed to be similar for all simulations regardless of the protein. The unfolding initiates at the N-terminal region or alternatively from the á-helix region and proceeds to the 'finger region'. Unfolding of these regions led to denaturated structures within the 4.5 ns simulation at 600 K. The results are in agreement with experimental mutant studies. The results show clearly that the stability of the protein is not evenly distributed over the whole structure. The MD analysis suggests regions in the protein structure which are more unstable and thus potential targets for mutation experiments to improve thermostability.
Original languageEnglish
Pages (from-to)551-559
JournalProtein Engineering, Design and Selection
Volume20
Issue number11
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • denaturation
  • molecular dynamics
  • thermostability
  • unfolding pathway
  • xylanase family 11

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