Regenerable Biosensors for Small-Molecule Kinetic Characterization Using SPR.

A key activity in small-molecule drug discovery is the characterization of compound-target interactions. Surface plasmon resonance (SPR) is a flexible technique for this purpose, with a wide affinity range (micromoles to picomoles), low protein requirements, and the ability to characterize the kinetics of compound binding. However, a key requirement of SPR is the immobilization of the target protein to the surface of the sensor chip. The most commonly used immobilization techniques (covalent immobilization, streptavidin-biotin) are irreversible in nature, which can afford excellent baseline stability but impose limitations throughput for slowly dissociating compounds or unstable targets. Reversible immobilization (e.g., His-tag-Ni-NTA) is possible but typically precludes accurate quantification of slow dissociation kinetics due to baseline drift.Here we present our investigation of three immobilization strategies (dual-His-tagged target protein, His-tagged streptavidin, and switchavidin) that combine the robustness of irreversible immobilization with the flexibility of reversible immobilization. Each has its own advantages and limitations, and while a universal immobilization procedure remains to be found, these strategies add to the immobilization toolbox that enables previously out-of-scope applications. Such applications are highlighted in two examples that greatly increased throughput for the kinetic characterization of potent kinase inhibitors and kinetic profiling of covalent inhibitors.

Ogilvie's syndrome with caecal perforation after Caesarean section: a case report.

INTRODUCTION: Ogilvie's syndrome describes the phenomenon of an acute colonic pseudo-obstruction without a mechanical cause. It is rare but has been reported to occur after Caesarean section. It can lead to bowel perforation or ischaemia. CASE PRESENTATION: A healthy, 28-year-old Caucasian woman presented 2 weeks past her expected date of delivery for her first pregnancy. She underwent an uncomplicated elective Caesarean section but developed abdominal pain and bloating postoperatively and was subsequently diagnosed with acute colonic pseudo-obstruction, also known as Ogilvie's syndrome. CONCLUSION: This case report highlights the rare, but potentially dangerous, diagnosis of Ogilvie's syndrome after Caesarean section. It is of particular interest to obstetricians, midwifery staff and general surgeons and shows the importance of accurate diagnosis, regular abdominal reassessment and early senior input to ensure appropriate and rapid treatment.