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Sökning: WFRF:(Bohn Georg)

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1.
  • Klein, Christoph, et al. (författare)
  • HAX1 deficiency causes autosomal recessive severe congenital neutropenia (Kostmann disease)
  • 2007
  • Ingår i: Nature Genetics. - : Springer Science and Business Media LLC. - 1061-4036 .- 1546-1718. ; 39:1, s. 86-92
  • Tidskriftsartikel (refereegranskat)abstract
    • Autosomal recessive severe congenital neutropenia (SCN) constitutes a primary immunodeficiency syndrome associated with increased apoptosis in myeloid cells, yet the underlying genetic defect remains unknown. Using a positional cloning approach and candidate gene evaluation, we identified a recurrent homozygous germline mutation in HAX1 in three pedigrees. After further molecular screening of individuals with SCN, we identified 19 additional affected individuals with homozygous HAX1 mutations, including three belonging to the original pedigree described by Kostmann. HAX1 encodes the mitochondrial protein HAX1, which has been assigned functions in signal transduction and cytoskeletal control. Here, we show that HAX1 is critical for maintaining the inner mitochondrial membrane potential and protecting against apoptosis in myeloid cells. Our findings suggest that HAX1 is a major regulator of myeloid homeostasis and underline the significance of genetic control of apoptosis in neutrophil development.
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2.
  • Sendker, Franziska L., et al. (författare)
  • Emergence of fractal geometries in the evolution of a metabolic enzyme
  • 2024
  • Ingår i: Nature. - : Springer Nature. - 0028-0836 .- 1476-4687. ; 628:8009, s. 894-900
  • Tidskriftsartikel (refereegranskat)abstract
    • Fractals are patterns that are self-similar across multiple length-scales1. Macroscopic fractals are common in nature2,3,4; however, so far, molecular assembly into fractals is restricted to synthetic systems5,6,7,8,9,10,11,12. Here we report the discovery of a natural protein, citrate synthase from the cyanobacterium Synechococcus elongatus, which self-assembles into Sierpiński triangles. Using cryo-electron microscopy, we reveal how the fractal assembles from a hexameric building block. Although different stimuli modulate the formation of fractal complexes and these complexes can regulate the enzymatic activity of citrate synthase in vitro, the fractal may not serve a physiological function in vivo. We use ancestral sequence reconstruction to retrace how the citrate synthase fractal evolved from non-fractal precursors, and the results suggest it may have emerged as a harmless evolutionary accident. Our findings expand the space of possible protein complexes and demonstrate that intricate and regulatable assemblies can evolve in a single substitution.
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