AI Article Synopsis
Article Abstract
Nitric oxide (NO) is a well-known active site ligand and inhibitor of respiratory terminal oxidases. Here, we investigated the interaction of NO with a purified chimeric - supercomplex composed of cytochrome and -type terminal oxidase. Strikingly, we found that the enzyme in turnover with O and reductants is resistant to inhibition by the ligand, being able to metabolize NO at 25 °C with an apparent turnover number as high as ≈303 mol NO (mol enzyme) min at 30 µM NO. The rate of NO consumption proved to be proportional to that of O consumption, with 2.65 ± 0.19 molecules of NO being consumed per O molecule by the mycobacterial -. The enzyme was found to metabolize the ligand even under anaerobic reducing conditions with a turnover number of 2.8 ± 0.5 mol NO (mol enzyme) min at 25 °C and 8.4 µM NO. These results suggest a protective role of mycobacterial supercomplexes against NO stress.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7697965 | PMC |
| http://dx.doi.org/10.3390/ijms21228521 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Anticonvulsant effects of pentoxifylline on seizures induced by pentylenetetrazole and maximal electroshock in male mice: The role of the nitrergic pathway.
IBRO Neurosci Rep
December 2024
Pharmacology Department, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Introduction: Epilepsy remains a challenge, with one-third of patients experiencing refractory seizures despite current anti-seizure medications. The nitrergic system, which involves nitric oxide (NO) and NO synthase (NOS) enzymes, plays a complex role in seizure pathophysiology. Pentoxifylline (PTPh), an FDA-approved phosphodiesterase inhibitor, has anticonvulsant effects; however, its relationship with the pathway is unclear.
View Article and Find Full Text PDFEvaluating the Role of Maximal Expiratory Flow at 25% (MEF-25) in Detecting and Managing Patients With Small Airway Disease in the United Arab Emirates.
Cureus
November 2024
Department of Pulmonary Medicine, King's College Hospital, Dubai, ARE.
Middle Eastern countries, such as the United Arab Emirates and Oman, are affected by frequent dust storms and extreme hot climatic conditions, which can exacerbate respiratory conditions. These environmental factors are particularly injurious to asthmatic patients, as they can aggravate small airway disease (SAD), leading to increased morbidity and healthcare challenges. The evaluation of maximal mid-expiratory flow (MEF-25) as a diagnostic and therapeutic tool for early-stage small airway dysfunction is of significant clinical importance, particularly in hot and arid metropolitan environments where dusty conditions exacerbate pulmonary issues.
View Article and Find Full Text PDFThe Effects of Acidified Nitrite on Wound Healing in Streptozotocin-Induced Diabetic Mice.
Adv Biomed Res
October 2024
Department of Anatomical Sciences, Faculty of Medicine, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Background: Diabetes mellitus (DM) is one of the most common metabolic diseases in the world. Studies have shown that nitric oxide (NO) promotes re-epithelialization and stimulates angiogenesis and neovascularization. This study aimed to investigate the effect of exogenous NO on diabetic wound healing.
View Article and Find Full Text PDFTargeting angiogenic and proliferative mediators by montelukast & trimetazidine Ameliorates thioacetamide-induced liver fibrosis in rats.
Toxicol Appl Pharmacol
December 2024
Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, 35516 Mansoura, Egypt; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura National University, Gamasa, 7731168, Egypt.
Liver fibrosis is a significant health complication with the potential to result in serious mortality and morbidity. However, there is no standard treatment due to its complex pathogenesis. The drug montelukast reversibly and selectively antagonizes the cysteinyl-leukotrienes-1 receptor and reduces inflammation; thus, it is used in the treatment of asthma.
View Article and Find Full Text PDFCorpus cavernosum and tunica albuginea reconstruction by tissue engineering: towards functional erectile structures regeneration.
BMC Urol
December 2024
Department of Cardiovascular Surgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, 410008, China.
Background: Current treatments for penile erectile structures reconstruction are limited and remain a great challenge in clinical practice. Tissue engineering techniques using different seed cells and scaffolds to construct a neo-tissue open promising avenues for penile erectile structures repair and replacement and show great promise in the restoration of: structure, mechanical property, and function which matches the original tissue.
Methods: A comprehensive literature review was conducted by accessing the NCBI PubMed, Cochrane, and Google Scholar databases from January 1, 1990, to January, 1, 2022 using the search terms "Tissue engineering, Corpus cavernosum (CC), Tunica albuginea (TA), Acellular Matrix, Penile Reconstruction".
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!