Folding of proteins with a flavodoxin-like architecture

Joseline A. Houwman, Carlo P.M. van Mierlo*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

The flavodoxin-like fold is a protein architecture that can be traced back to the universal ancestor of the three kingdoms of life. Many proteins share this α-β parallel topology and hence it is highly relevant to illuminate how they fold. Here, we review experiments and simulations concerning the folding of flavodoxins and CheY-like proteins, which share the flavodoxin-like fold. These polypeptides tend to temporarily misfold during unassisted folding to their functionally active forms. This susceptibility to frustration is caused by the more rapid formation of an α-helix compared to a β-sheet, particularly when a parallel β-sheet is involved. As a result, flavodoxin-like proteins form intermediates that are off-pathway to native protein and several of these species are molten globules (MGs). Experiments suggest that the off-pathway species are of helical nature and that flavodoxin-like proteins have a nonconserved transition state that determines the rate of productive folding. Folding of flavodoxin from Azotobacter vinelandii has been investigated extensively, enabling a schematic construction of its folding energy landscape. It is the only flavodoxin-like protein of which cotranslational folding has been probed. New insights that emphasize differences between in vivo and in vitro folding energy landscapes are emerging: the ribosome modulates MG formation in nascent apoflavodoxin and forces this polypeptide toward the native state.
Original languageEnglish
Pages (from-to)3145-3167
JournalFEBS Journal
Volume284
Issue number19
Early online date28 Apr 2017
DOIs
Publication statusPublished - 3 Oct 2017

Keywords

  • Apoflavodoxin
  • CheY
  • Cotranslational folding
  • Frustration
  • Molten globule
  • NtrC
  • Off-pathway intermediate
  • Ribosome-nascent chain complex
  • Simulation
  • Spo0F

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