Probing conformational dynamics of DNA binding by CO-sensing transcription factor, CooA.

The transcription factor CooA is a CRP/FNR (cAMP receptor protein/ fumarate and nitrate reductase) superfamily protein that uses heme to sense carbon monoxide (CO). Allosteric activation of CooA in response to CO binding is currently described as a series of discrete structural changes, without much consideration for the potential role of protein dynamics in the process of DNA binding. This work uses site-directed spin-label electron paramagnetic resonance spectroscopy (SDSL-EPR) to probe slow timescale (μs-ms) conformational dynamics of CooA with a redox-stable nitroxide spin label, and IR spectroscopy to probe the environment at the CO-bound heme.

Surveyed veterinary students in Australia find ChatGPT practical and relevant while expressing no concern about artificial intelligence replacing veterinarians.

Background: Chat Generative Pre-trained Transformer (ChatGPT) is a freely available online artificial intelligence (AI) program capable of understanding and generating human-like language. This study assessed veterinary students' perceptions about ChatGPT in education and practice. It compared perceptions about ChatGPT between students who had completed a critical analysis task and those who had not.

Carbon Monoxide-Sensing Transcription Factors: Regulators of Microbial Carbon Monoxide Oxidation Pathway Gene Expression.

Carbon monoxide (CO) serves as a source of energy and carbon for a diverse set of microbes found in anaerobic and aerobic environments. The enzymes that bacteria and archaea use to oxidize CO depend upon complex metallocofactors that require accessory proteins for assembly and proper function. This complexity comes at a high energetic cost and necessitates strict regulation of CO metabolic pathways in facultative CO metabolizers to ensure that gene expression occurs only when CO concentrations and redox conditions are appropriate.

Quaternary Structure and Deoxyribonucleic Acid-Binding Properties of the Heme-Dependent, CO-Sensing Transcriptional Regulator RcoM.

RcoM, a heme-containing, CO-sensing transcription factor, is one of two known bacterial regulators of CO metabolism. Unlike its analogue CooA, the structure and DNA-binding properties of RcoM remain largely uncharacterized. Using a combination of size exclusion chromatography and sedimentation equilibrium, we demonstrate that RcoM-1 from is a dimer, wherein the heme-binding domain mediates dimerization.

Resting and postprandial serum bile acid concentrations in dogs with liver disease.

Background: Serum bile acids (SBAs) are frequently measured in dogs. However, there is limited data comparing SBAs in different liver diseases diagnosed according to standardized histological criteria.

Objectives: To compare resting and postprandial SBAs, and determine their sensitivity and specificity, for various liver diseases in dogs.

Prevalence of bacteria and changes in trends in antimicrobial resistance of isolated from positive canine urinary samples from an Australian referral hospital over a 5-year period (2013-2017).

Lower urinary tract disease is common in dogs with approximately 14% developing a bacterial lower urinary tract infection (UTI) during their lifetime. Empirical antimicrobials are often prescribed while waiting urine culture and susceptibility results. Regional knowledge of bacterial prevalence and antimicrobial resistance patterns aids veterinarians in antimicrobial choice.

Caroli's-type ductal plate malformation and a portosystemic shunt in a 4-month-old kitten.

Case Summary: A 4-month-old neutered male Russian Blue kitten had a 4 week history of hypersalivation and failure to thrive. In addition, there was a 2 week history of soft tissue swelling on the ventral abdomen, which had failed to improve with antimicrobial therapy. There were no significant physical examination or neurological deficits on examination; however, the cat had a quiet demeanour for its age.

Persuasive system features in computer-mediated lifestyle modification interventions for physical activity.

: Increasing physical activity has been identified as one of the most important factors in lifestyle modification. Previous studies have reported the effectiveness of using the Internet in motivating behavioral modifications of physical activities. The aim of this study is to identify the persuasive system features most frequently used in computer-mediated physical activities in the current literature.

Effect of age and surgical approach on perioperative wound complication following ovariohysterectomy in shelter-housed cats in Australia.

Objectives: The aim of the study was to investigate the effects of age and/or surgical approach on perioperative wound complication following ovariohysterectomy (OHE).

Methods: A retrospective search of perioperative monitoring records from a shelter desexing program was conducted to identify cats that underwent OHE between 1 June 2010 and 31 December 2012 inclusive. A wound complication was defined as gross observation of inflammation or wound dehiscence at the surgical site in the 5 day postoperative period.