5 research outputs found
Dynamic Assembly/Disassembly of Staphylococcus aureus FtsZ Visualized by High-Speed Atomic Force Microscopy
FtsZ is a key protein in bacterial cell division and is assembled into filamentous architectures. FtsZ filaments are thought to regulate bacterial cell division and have been investigated using many types of imaging techniques such as atomic force microscopy (AFM), but the time scale of the method was too long to trace the filament formation process. Development of high-speed AFM enables us to achieve sub-second time resolution and visualize the formation and dissociation process of FtsZ filaments. The analysis of the growth and dissociation rates of the C-terminal truncated FtsZ (FtsZt) filaments indicate the net growth and dissociation of FtsZt filaments in the growth and dissociation conditions, respectively. We also analyzed the curvatures of the full-length FtsZ (FtsZf) and FtsZt filaments, and the comparative analysis indicated the straight-shape preference of the FtsZt filaments than those of FtsZf. These findings provide insights into the fundamental dynamic behavior of FtsZ protofilaments and bacterial cell division
Discovery of ONO-7300243 from a Novel Class of Lysophosphatidic Acid Receptor 1 Antagonists: From Hit to Lead
Lysophosphatidic
acid (LPA) evokes various physiological responses through a series
of G protein-coupled receptors known as LPA<sub>1–6</sub>.
A high throughput screen against LPA<sub>1</sub> gave compound <b>7a</b> as a hit. The subsequent optimization of <b>7a</b> led to <b>ONO-7300243</b> (<b>17a</b>) as a novel, potent
LPA<sub>1</sub> antagonist, which showed good efficacy <i>in
vivo</i>. The oral dosing of <b>17a</b> at 30 mg/kg led
to reduced intraurethral pressure in rats. Notably, this compound
was equal in potency to the α<sub>1</sub> adrenoceptor antagonist
tamsulosin, which is used in clinical practice to treat dysuria with
benign prostatic hyperplasia (BPH). In contrast to tamsulosin, compound <b>17a</b> had no impact on the mean blood pressure at this dose.
These results suggest that LPA<sub>1</sub> antagonists could be used
to treat BPH without affecting the blood pressure. Herein, we report
the hit-to-lead optimization of a unique series of LPA<sub>1</sub> antagonists and their <i>in vivo</i> efficacy