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Molecular mechanisms of inorganic-phosphate release from the core and barbed end of actin filaments
(2023)
The release of inorganic phosphate (Pi) from actin filaments constitutes a key step in their regulated turnover, which is fundamental to many cellular functions. However, the molecular mechanisms underlying Pi release from both the core and barbed end of actin filaments remain unclear. Here, we combine cryo-EM with molecular dynamics simulations and in vitro reconstitution to demonstrate how actin releases Pi through a ‘molecular backdoor’. While constantly open at the barbed end, the backdoor is predominantly closed in filament-core subunits and only opens transiently through concerted backbone movements and rotameric rearrangements of residues close to the nucleotide binding pocket. This mechanism explains why Pi escapes rapidly from the filament end and yet slowly from internal actin subunits. In an actin variant associated with nemaline myopathy, the backdoor is predominantly open in filament-core subunits, resulting in greatly accelerated Pi release after polymerization and filaments with drastically shortened ADP-Pi caps. This demonstrates that the Pi release rate from F-actin is controlled by steric hindrance through the backdoor rather than by the disruption of the ionic bond between Pi and Mg2+ at the nucleotide-binding site. Our results provide the molecular basis for Pi release from actin and exemplify how a single, disease-linked point mutation distorts the nucleotide state distribution and atomic structure of the actin filament.
Die Goethe-Universität hat zwei neue DFG-Graduiertenkollegs eingeworben. »Fixing Futures« ist ganz in Frankfurt angesiedelt und befasst sich mit der Antizipation von Zukünften. Ein zweites, gemeinsam mit der Technischen Universität (TU) Darmstadt beantragtes Graduiertenkolleg widmet sich der Frage, wie »Standards des Regierens« die Möglichkeit kollektiver Selbstbestimmung verändern.
Scelolabes, historically is a monotypic genus of Ocydromiinae (Hybotidae) that for a long time was not studied due to the absence of the type of the type species (Scelolabes bivittatus Philippi), which is probably lost or destroyed. In this context, we propose an updated diagnosis and redescription of the genus, based on specimens identified by experts and in agreement with the original description of Philippi (1865), as well as illustrating male and female terminalia for the first time. This serves as an aid to discuss and corroborate the status of Scelolabes in the Neotropical region as a genus distinct from Hoplopeza. In addition, two new species are described, and an identification key and a distribution map are provided to all the Neotropical species of the genus.
In der an der Universitätsbibliothek angesiedelten Sammlungskoordination fand im Herbst/Winter 2022/23 mit Unterstützung des Zentrums für interdisziplinäre Afrikaforschung (ZIAF) das Projekt »Sammlungsgut aus Afrika in den Sammlungen an der Goethe-Universität« statt. Ziel des Vorhabens war die digitale Zugänglichmachung von Objektbeständen aus dem afrikanischen Kontinent. Abgeschlossen wurde das Vorhaben durch einen Workshop unter Beteiligung von Sammlungsverantwortlichen und Expert*innen aus der GU und darüber hinaus. Im Interview mit Melda Demir geben Sammlungskoordinatorin Dr. Judith Blume und Projektmitarbeiter Sebastian Burger Auskunft zum Projekt.
The southern South American genus Guaranita includes tiny spiders (body length ~1 mm) that lead reclusive lives under ground-objects and run rapidly when disturbed. As a result, they have been poorly collected and studied. Here we report on a recent collection of Guaranita spiders from Argentina, describing one new species (G. auadae Huber sp. nov.) and the previously unknown female of G. dobby Torres et al., 2016. In addition, we provide CO1 barcodes for all (now five) known species, first SEM data, and first chromosome data for the genus. The diploid number of Guaranita goloboffi Huber, 2000 (2n♂ = 11) is among the lowest in araneomorph spiders with monocentric chromosome structure.
Serratichneumon Riedel & Sheng gen. nov. and Serratichneumon maculatus Sheng & Riedel gen. et sp. nov. belonging to the tribe Ichneumonini of subfamily Ichneumoninae (Hymenoptera: Ichneumonidae), collected in the Oriental Region (China, Vietnam, and Indonesia), are described and illustrated. The new genus is placed in Tereshkin’s key to the Palaearctic genera of the subtribe Amblytelina, and compared with similar genera, Hepiopelmus Wesmael, 1845, and Tricholabus Thomson, 1894.