Corrin Ring Modifications Reveal the Chemical and Spatial Requirements for the B-btuB Riboswitch Interaction.

The btuB riboswitch is a regulatory RNA sequence controlling gene expression of the outer membrane B transport protein BtuB by specifically binding coenzyme B (AdoCbl) as its natural ligand. The B sensing riboswitch class is known to accept various B derivatives, leading to a division into two riboswitch subclasses, dependent on the size of the apical ligand. Here we focus on the role of side chains b and e on affinity and proper recognition, i.

Fluid shear stress-modulated chromatin accessibility reveals the mechano-dependency of endothelial SMAD1/5-mediated gene transcription.

Bone morphogenetic protein (BMP) signaling and fluid shear stress (FSS) mediate complementary functions in vascular homeostasis and disease development. It remains to be shown whether altered chromatin accessibility downstream of BMP and FSS offers a crosstalk level to explain changes in SMAD-dependent transcription. Here, we employed ATAC-seq to analyze arterial endothelial cells stimulated with BMP9 and/or FSS.

The structural features of the ligand-free moaA riboswitch and its ion-dependent folding.

Riboswitches are structural elements of mRNA involved in the regulation of gene expression by responding to specific cellular metabolites. To fulfil their regulatory function, riboswitches prefold into an active state, the so-called binding competent form, that guarantees metabolite binding and allows a consecutive refolding of the RNA. Here, we describe the folding pathway to the binding competent form as well as the ligand free structure of the moaA riboswitch of E.

Atheroprone fluid shear stress-regulated ALK1-Endoglin-SMAD signaling originates from early endosomes.

Background: Fluid shear stress enhances endothelial SMAD1/5 signaling via the BMP9-bound ALK1 receptor complex supported by the co-receptor Endoglin. While moderate SMAD1/5 activation is required to maintain endothelial quiescence, excessive SMAD1/5 signaling promotes endothelial dysfunction. Increased BMP signaling participates in endothelial-to-mesenchymal transition and inflammation culminating in vascular diseases such as atherosclerosis.

Cell-Specific Delivery Using an Engineered Protein Nanocage.

Nanoparticle-based delivery systems have shown great promise for theranostics and bioimaging on the laboratory scale due to favorable pharmacokinetics and biodistribution. In this study, we examine the utility of a cage-forming variant of the protein lumazine synthase, which was previously designed and evolved to encapsulate biomacromolecular cargo. Linking antibody-binding domains to the exterior of the cage enabled binding of targeting immunoglobulins and cell-specific uptake of encapsulated cargo.

Differential Impact of Fluid Shear Stress and YAP/TAZ on BMP/TGF-β Induced Osteogenic Target Genes.

Bone is a remarkable dynamic structure, which integrates mechanical and biochemical signaling inputs. Interstitial fluid in the intramedullary space transmits signals derived from compression-induced fluid shear stress (FSS) to stimulate osteoblasts for bone formation. Using a flow system and human osteoblasts, this study demonstrates how BMP/TGF-β  signaling integrates stimuli derived from FSS and YAP/TAZ and confirms these findings by transcriptome analyses.

Antagonistic Activities of Vegfr3/Flt4 and Notch1b Fine-tune Mechanosensitive Signaling during Zebrafish Cardiac Valvulogenesis.

The formation of cardiac valves depends on mechanical forces exerted by blood flow. Endocardial cells lining the interior of the heart are sensitive to these stimuli and respond by rearranging into luminal cells subjected to shear stress and abluminal cells not exposed to it. The mechanisms by which endocardial cells sense these dynamic biomechanical stimuli and how they evoke different cellular responses are largely unknown.

Gene expression in response to cyclic mechanical stretch in primary human dermal fibroblasts.

The human dermal skin is permanently exposed to mechanical stress, for instance during facial expression, which might cause wrinkles with age. Cyclic mechanical stretching of cells results in cellular and cytoskeleton alignment perpendicular to the stretch direction regulating cellular response. With gene expression profiling it was aimed to identify the differentially expressed genes associated with the regulation of the cytoskeleton to investigate the stretch-induced cell alignment mechanism.

Distinct kinetics of (H/K/N)Ras glucosylation and Rac1 glucosylation catalysed by Clostridium sordellii lethal toxin.

Mono-glucosylation of (H/K/N)Ras by Clostridium sordellii lethal toxin (TcsL) blocks critical survival signaling pathways, resulting in apoptotic cell death. One yet unsolved problem in studies on TcsL is the lack of a method allowing the specific detection of (H/K/N)Ras glucosylation. In this study, we identify the Ras(Mab 27H5) antibody as a glucosylation-sensitive antibody capable for the immunoblot detection of (H/K/N)Ras glucosylation in TcsL-treated cells.