BtuCD is an ABC transporter catalyzing the uptake of vitamin B₁₂ across the Escherichia coli inner membrane. A previously reported X-ray structure of BtuCD in complex with the periplasmic vitamin B₁₂-binding protein BtuF revealed asymmetry of the transmembrane BtuC subunits. The functional relevance of this asymmetry has remained uncertain. Here we report the X-ray structure of a catalytically impaired BtuCD mutant in complex with BtuF, where the BtuC subunits adopt a distinct asymmetric conformation. The structure suggests that BtuF does not discriminate between, or impose, asymmetric conformations of BtuCD. It also explains the conformational disorder observed in BtuCDF crystals.
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http://dx.doi.org/10.1016/j.febslet.2012.02.042 | DOI Listing |
Biol Trace Elem Res
January 2025
School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, 710061, China.
Cadmium is a heavy metal contaminant known to cause various health issues. However, limited research exists on the serum metabolomic effects of cadmium exposure in children. In this study, we recruited 42 children to analyze their serum metabolomic profiles, along with measuring urinary cadmium and creatinine concentrations, to evaluate the impact of environmental cadmium exposure on serum metabolism.
View Article and Find Full Text PDFJ Endocrinol Invest
January 2025
Section of Endocrinology, Geriatrics and Internal Medicine, Department of Medical Sciences, University of Ferrara, Ferrara, Italy.
Aim: This review aims to overview factors contributing to TAO development and addresses the targeted diagnostic work-up and treatment management in adult thalassemic patients.
Results: Osteoporosis management in Thalassemia is challenging because several factors contributing to its pathogenesis should be considered and controlled starting from child- hood. A multidisciplinary approach is crucial.
Eur Arch Otorhinolaryngol
January 2025
Hospital QuironSalud Infanta Luisa, Seville, Spain.
Purpose: Benign paroxysmal positional vertigo (BPPV) is a vestibular disorder causing recurrent episodes of vertigo. Despite symptom resolution at discharge, events such as relapses, migraines, neck pain, falls, and persistent postural-perceptual dizziness (PPPD) may occur. This study aims to estimate the incidence, timing, and risk factors for these symptoms.
View Article and Find Full Text PDFIndian J Pediatr
January 2025
Division of Pediatric Endocrinology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, 110029, India.
Andes Pediatr
October 2024
Facultad de Medicina, Departamento de Gastroenterología y Nutrición Pediátrica, Pontificia Universidad Católica de Chile, Santiago, Chile.
Unlabelled: The Ketogenic Diet (KD) is a non-pharmacological strategy for drug-resistant epilepsy (DRE) and inborn errors of metabolism (Glut-1 deficiency) management. KD is characterized by being restrictive, affecting micronutrient intake. There are different modalities of KD in which food intake and nutritional deficiencies vary.
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