A blue light receptor that mediates RNA binding and translational regulation

Sensory photoreceptor proteins underpin light-dependent adaptations in nature and enable the optogenetic control of organismal behavior and physiology. We identified the bacterial light-oxygen-voltage (LOV) photoreceptor PAL that sequence-specifically binds short RNA stem loops with around 20 nM affinity in blue light and weaker than 1 µM in darkness. A crystal structure rationalizes the unusual receptor architecture of PAL with C-terminal LOV photosensor and N-terminal effector units. The light-activated PAL–RNA interaction can be harnessed to regulate gene expression at the RNA level as a function of light in both bacteria and mammalian cells. The present results elucidate a new signal-transduction paradigm in LOV receptors and conjoin RNA biology with optogenetic regulation, thereby paving the way toward hitherto inaccessible optoribogenetic modalities

Medicus Adaptabilis – Wenn Fachwissen alleine nicht mehr ausreichend ist

Dieser Beitrag weist auf die zunehmende Bedeutung der Veränderungsfähigkeit in Organisationen allgemein und im Gesundheitswesen im Besonderen hin. Die zu beobachtenden demographischen Entwicklungen, das steigende Gesundheitsbewusstsein sowie die fortschreitende Digitalisierung erfordern eine rasche Anpassungsfähigkeit auf allen Ebenen des Gesundheitswesens. Es wird aufgezeigt, über welche Kompetenzen die Beschäftigten zukünftig verfügen müssen, um den Trends in der Gesundheitsbranche erfolgreich zu begegnen. Darüber hinaus wird diskutiert, welchen Beitrag das Kompetenzmanagement zum Aufbau dieser Kompetenzen leisten kann

Signal transduction in light-oxygen-voltage receptors lacking the active-site glutamine

In nature as in biotechnology, light-oxygen-voltage photoreceptors perceive blue light to elicit spatiotemporally defined cellular responses. Photon absorption drives thioadduct formation between a conserved cysteine and the flavin chromophore. An equally conserved, proximal glutamine processes the resultant flavin protonation into downstream hydrogen-bond rearrangements. Here, we report that this glutamine, long deemed essential, is generally dispensable. In its absence, several light-oxygen-voltage receptors invariably retained productive, if often attenuated, signaling responses. Structures of a light-oxygen-voltage paradigm at around 1 Å resolution revealed highly similar light-induced conformational changes, irrespective of whether the glutamine is present. Naturally occurring, glutamine-deficient light-oxygen-voltage receptors likely serve as bona fide photoreceptors, as we showcase for a diguanylate cyclase. We propose that without the glutamine, water molecules transiently approach the chromophore and thus propagate flavin protonation downstream. Signaling without glutamine appears intrinsic to light-oxygen-voltage receptors, which pertains to biotechnological applications and suggests evolutionary descendance from redox-active flavoproteins

Methods and concepts in management : significance, satisfaction and suggestions for further research? Perspectives from Germany, Austria and Switzerland

Considering the number of management concepts and methods that are created, published and promoted it seems possible to create breakthrough initiatives every day. Unfortunately some of them are ephemeral fads with little effect on business success. Based on a survey of 114 German, Swiss and Austrian consultants, this paper tries to help managers to determine which concepts will be of significant importance in the coming years. The authors argue that shareholder value is out, strategic planning makes a comeback, downsizing, lean management and TQM were themes of the last century, knowledge management has to become more user-friendly to survive, and process management and CRM gain in importance