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Sökning: WFRF:(Cunningham Fiona) > Refereegranskat > Naturvetenskap

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1.
  • 2019
  • Tidskriftsartikel (refereegranskat)
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2.
  • Nørholm, Morten H. H., et al. (författare)
  • Converting a Marginally Hydrophobic Soluble Protein into a Membrane Protein
  • 2011
  • Ingår i: Journal of Molecular Biology. - : Elsevier BV. - 0022-2836 .- 1089-8638. ; 407:1, s. 171-179
  • Tidskriftsartikel (refereegranskat)abstract
    • delta-Helices are marginally hydrophobic a-helical segments in soluble proteins that exhibit certain sequence characteristics of transmembrane (TM) helices [Cunningham, F., Rath, A., Johnson, R. M. & Deber, C. M. (2009). Distinctions between hydrophobic helices in globular proteins and TM segments as factors in protein sorting. J. Biol. Chem., 284, 5395-402]. In order to better understand the difference between delta-helices and TM helices, we have studied the insertion of five TM-like delta-helices into dog pancreas microsomal membranes. Using model constructs in which an isolated delta-helix is engineered into a bona fide membrane protein, we find that, for two delta-helices originating from secreted proteins, at least three single-nucleotide mutations are necessary to obtain efficient membrane insertion, whereas one mutation is sufficient in a delta-helix from the cytosolic protein P450BM-3. We further find that only when the entire upstream region of the mutated delta-helix in the intact cytochrome P450BM-3 is deleted does a small fraction of the truncated protein insert into microsomes. Our results suggest that upstream portions of the polypeptide, as well as embedded charged residues, protect delta-helices in globular proteins from being recognized by the signal recognition particle-Sec61 endoplasmic-reticulum-targeting machinery and that delta-helices in secreted proteins are mutationally more distant from TM helices than delta-helices in cytosolic proteins.
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3.
  • Falster, Daniel, et al. (författare)
  • AusTraits, a curated plant trait database for the Australian flora
  • 2021
  • Ingår i: Scientific Data. - : Nature Portfolio. - 2052-4463. ; 8:1
  • Tidskriftsartikel (refereegranskat)abstract
    • We introduce the AusTraits database - a compilation of values of plant traits for taxa in the Australian flora (hereafter AusTraits). AusTraits synthesises data on 448 traits across 28,640 taxa from field campaigns, published literature, taxonomic monographs, and individual taxon descriptions. Traits vary in scope from physiological measures of performance (e.g. photosynthetic gas exchange, water-use efficiency) to morphological attributes (e.g. leaf area, seed mass, plant height) which link to aspects of ecological variation. AusTraits contains curated and harmonised individual- and species-level measurements coupled to, where available, contextual information on site properties and experimental conditions. This article provides information on version 3.0.2 of AusTraits which contains data for 997,808 trait-by-taxon combinations. We envision AusTraits as an ongoing collaborative initiative for easily archiving and sharing trait data, which also provides a template for other national or regional initiatives globally to fill persistent gaps in trait knowledge.
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