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https://www.readbyqxmd.com/read/29229761/an-unusual-diphosphatase-from-the-phnp-family-cleaves-reactive-fad-photoproducts
#1
Guillaume Aw Beaudoin, Qiang Li, Steven D Bruner, Andrew D Hanson
Flavins are notoriously photolabile, but while the photoproducts derived from the iso -alloxazine ring are well known the other photoproducts are not. In the case of FAD, typically the main cellular flavin, the other photoproducts are predicted to include four- and five-carbon sugars linked to ADP. These FAD photoproducts were shown to be potent glycating agents, more so than ADP-ribose. Such toxic compounds would require disposal via an ADP-sugar diphosphatase or other route. Comparative analysis of bacterial genomes uncovered a candidate disposal gene that is chromosomally clustered with genes for FAD synthesis or transport and is predicted to encode a protein of the PhnP cyclic phosphodiesterase family...
December 11, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/29227220/taxonomic-analyses-of-members-of-the-streptomyces-cinnabarinus-cluster-description-of-streptomyces-cinnabarigriseus-sp-nov-and-streptomyces-davaonensis-sp-nov
#2
Wiebke Landwehr, Peter Kämpfer, Stefanie P Glaeser, Christian Rückert, Jörn Kalinowski, Jochen Blom, Alexander Goesmann, Matthias Mack, Peter Schumann, Ewelina Atasayar, Richard L Hahnke, Manfred Rohde, Karin Martin, Marc Stadler, Joachim Wink
Roseoflavin is the only known riboflavin (vitamin B2) analog with antibiotic properties. It is actively taken up by many micro-organisms and targets flavinmononucleotide riboswitches and flavoproteins. It is described as the product of the tentatively named 'Streptomyces davawensis' JCM 4913. Taxonomic analysis of this strain with a polyphasic approach showed that it is very closely related to Streptomyces cinnabarinus (DSM 40467). The two Streptomyces isolates were obtained from different geographical locations (the Philippines and the Kamchatka Peninsula, respectively), their genomes have been sequenced and the question was whether or not the two isolates were representatives of the same species...
December 11, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29226080/fad-influx-enhances-neuronal-differentiation-of-human-neural-stem-cells-by-facilitating-nuclear-localization-of-lsd1
#3
Kazumi Hirano, Masakazu Namihira
Flavin adenine dinucleotide (FAD), synthesized from riboflavin, is redox cofactor in energy production and plays an important role in cell survival. More recently, riboflavin deficiency has been linked to developmental disorders, but its role in stem cell differentiation remains unclear. Here, we show that FAD treatment, using DMSO as a solvent, enabled an increase in the amount of intracellular FAD and promoted neuronal differentiation of human neural stem cells (NSCs) derived not only from fetal brain, but also from induced pluripotent stem cells...
December 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/29223236/mechanical-outcome-of-accelerated-corneal-crosslinking-evaluated-by%C3%A2-brillouin%C3%A2-microscopy
#4
Joshua N Webb, Johnny P Su, Giuliano Scarcelli
PURPOSE: To quantify corneal mechanical changes induced by corneal crosslinking (CXL) procedures of different ultraviolet-A (UVA) intensity and exposure time using Brillouin microscopy. SETTINGS: University of Maryland, College Park, Maryland, USA. DESIGN: Experimental study. METHODS: Porcine cornea samples were debrided of epithelia and soaked with riboflavin 0.1% solution. Samples were exposed to a standard 5.4 J/cm2 of UVA radiation with varying intensity and exposure time as follows: 3 mW/cm2 for 30...
November 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29212059/on-the-nature-of-solvatochromic-effect-the-riboflavin-absorption-spectrum-as-a-case-study
#5
Isabella Daidone, Andrea Amadei, Massimiliano Aschi, Laura Zanetti-Polzi
We present here the calculation of the absorption spectrum of riboflavin in acetonitrile and dimethyl sulfoxide using a hybrid quantum/classical approach, namely the perturbed matrix method, based on quantum mechanical calculations and molecular dynamics simulations. The calculated spectra are compared to the absorption spectrum of riboflavin previously calculated in water and to the experimental spectra obtained in all three solvents. The experimentally observed variations in the absorption spectra upon change of the solvent environment are well reproduced by the calculated spectra...
November 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29204204/thiamine-responsive-pyruvate-dehydrogenase-complex-deficiency-a-potentially-treatable-cause-of-leigh-s-disease
#6
Prashant Jauhari, Naveen Sankhyan, Sameer Vyas, Pratibha Singhi
Pyruvate dehydrogenase complex (PDHC) deficiency is a rare metabolic disorder that affects tissues with high energy demand such as the central nervous system. The clinico-radiological phenotype of Leigh's disease is one of its common presentations. We present a 9-month-old boy with rapidly progressive infantile Leigh's disease. PDHA1 gene sequencing revealed a pathological homozygous missense mutation c.131A>G or p.H44R in exon 3 consistent with PDHC deficiency. H44R is among the five mutations (H44R, R88S, G89S, R263G, and V389fs) in E1α subunit that is thiamine-responsive...
July 2017: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/29203068/prospective-randomized-trial-of-corneal-cross-linking-riboflavin-dosing-frequencies-for-treatment-of-keratoconus-and-corneal-ectasia
#7
Marianne O Price, Kelly Fairchild, Matthew T Feng, Francis W Price
PURPOSE: To investigate whether the riboflavin dosing frequency affects corneal cross-linking efficacy or safety, given that isotonic riboflavin solution is viscous and each installation coats the corneal surface with a film that absorbs some of the incident ultraviolet A light. DESIGN: Prospective, randomized, single-center equivalence trial. PARTICIPANTS: Patients with progressive keratoconus or ectasia after refractive surgery (n = 510)...
December 1, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29194776/endosymbiosis-and-its-significance-in-dermatology
#8
REVIEW
Katarzyna Kubiak, Hanna Sielawa, Wenchieh Chen, Ewa Dzika
Proposed at the beginning of the 20th to explain the origin of eukaryotic organelles from prokaryotes, endosymbiosis is now medically defined by various interaction patterns between microorganisms and their residing hosts, best exemplified by the bacterial endosymbiont Wolbachia identified in arthropods and filarial nematodes, which can influence normal development, reproduction, survival, and transmission of the hosts. Based on the transmission modes, vertical or horizontal, and the function of the endosymbionts, the host-symbiont dependence can be divided into primary or secondary...
December 1, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29193829/riboflavin-transporter-deficiency-mimicking-mitochondrial-myopathy-caused-by-complex-ii-deficiency
#9
Graeme A M Nimmo, Resham Ejaz, Dawn Cordeiro, Peter Kannu, Saadet Mercimek-Andrews
Biallelic likely pathogenic variants in SLC52A2 and SLC52A3 cause riboflavin transporter deficiency. It is characterized by muscle weakness, ataxia, progressive ponto-bulbar palsy, amyotrophy, and sensorineural hearing loss. Oral riboflavin halts disease progression and may reverse symptoms. We report two new patients whose clinical and biochemical features were mimicking mitochondrial myopathy. Patient 1 is an 8-year-old male with global developmental delay, axial and appendicular hypotonia, ataxia, and sensorineural hearing loss...
November 30, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29191464/bombyx-ortholog-of-the-drosophila-eye-color-gene-brown-controls-riboflavin-transport-in-malpighian-tubules
#10
Haokun Zhang, Takashi Kiuchi, Chikara Hirayama, Susumu Katsuma, Toru Shimada
The Drosophila eye color gene brown is known to control the transport of pteridine precursors in adult eyes. The Brown protein belongs to the ATP-binding cassette (ABC) transporter G family, which includes proteins encoded by the genes brown, scarlet, and white. These genes are responsible for pigmentation in Drosophila and the domestic silkworm Bombyx mori. Although orthologs of brown are conserved among insects, the function of this gene is only known in Drosophila. Here, we elucidated the function of the B...
November 27, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29189841/probing-electron-transfer-between-hemin-and-riboflavin-using-a-combination-of-analytical-approaches-and-theoretical-calculations
#11
Wen-Lan Wang, Yuan Min, Sheng-Song Yu, Wei Chen, Jie-Jie Chen, Xiao-Yang Liu, Han-Qing Yu
Extracellular electron transfer (EET) occurs from outer-membrane proteins to electron acceptors. Heme(ii) is the active center of outer-membrane proteins and delivers electrons to acceptors or mediators such as riboflavin, a redox active chromophore present in organisms. However, the EET mechanism via mediators, especially the electron transfer process from outer-membrane proteins to mediators, has not been well documented yet. In this work, the mechanism behind the electron transfer from heme(ii) to riboflavin is investigated by using in situ ultraviolet visible and fluorescence spectroelectrochemical analysis, which provides the information regarding the structural change and electrochemical characteristics of species in the electron transfer process...
November 30, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29185933/severe-riboflavin-deficiency-induces-alterations-in-the-hepatic-proteome-of-starter-pekin-ducks
#12
Jing Tang, Maria A Hegeman, Jian Hu, Ming Xie, Wenbiao Shi, Yong Jiang, Vincent de Boer, Yuming Guo, Shuisheng Hou, Jaap Keijer
Suboptimal vitamin B2 status is encountered globally. Riboflavin deficiency depresses growth and results in a fatty liver. The underlying mechanisms remain to be established and an overview of molecular alterations is lacking. We investigated hepatic proteome changes induced by riboflavin deficiency to explain its effects on growth and hepatic lipid metabolism. In all, 360 1-d-old Pekin ducks were divided into three groups of 120 birds each, with twelve replicates and ten birds per replicate. For 21 d, the ducks were fed ad libitum a control diet (CAL), a riboflavin-deficient diet (RD) or were pair-fed with the control diet to the mean daily intake of the RD group (CPF)...
November 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/29183775/novel-effects-of-phytoestrogenic-soy-isoflavones-on-serum-calcium-and-chloride-in-premenopausal-women-a-2-year-double-blind-randomized-placebo-controlled-study
#13
Lee-Jane W Lu, Nai-Wei Chen, Fatima Nayeem, V-M Sadagopa Ramanujam, Yong-Fang Kuo, Donald G Brunder, Manubai Nagamani, Karl E Anderson
BACKGROUND: Soy phytoestrogens are potential alternatives to postmenopausal hormone replacement therapy (HRT). Adverse effects of HRT such as myocardial infarction, stroke, and pulmonary embolism are mediated by calcium-induced signaling. OBJECTIVE: To determine whether soy isoflavones affect serum calcium in healthy female subjects. DESIGN: In a double-blind trial, 197 premenopausal women were randomly assigned to either isoflavone (N = 99) or placebo pills (N = 98) 5 days per week for up to 2 years, plus prenatal vitamins...
November 11, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29178698/effects-of-riboflavin-calcium-phosphate-layer-and-adhesive-system-on-stress-strain-behavior-of-demineralized-dentin
#14
Tissiana Bortolotto, Anastasia Ryabova, Izabella Nerushay, Sabine Kling, Farhad Hafezi, Franklin Garcia-Godoy, Ivo Krejci
PURPOSE: To evaluate if three dentin treatments improved mechanical properties of demineralized dentin. METHODS: Dentin slices were demineralized and treated with a universal adhesive, Scotchbond Universal (SBU), a cross-linker, Riboflavin (RF), and a calcium phosphate-based product, Teethmate (TM). The groups (n= 8 per group) were: Group 1: SBU, Group 2: RF + SBU, Group 3: RF + TM + SBU. Tensile tests were performed; stress/strain curves and E modulus were calculated...
August 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29176450/corneal-cross-linking-with-verteporfin-and-nonthermal-laser-therapy
#15
Saleh A Alageel, Samer N Arafat, Borja Salvador-Culla, Paraskevi E Kolovou, Khadijeh Jahanseir, Adam Kozak, Gavin J C Braithwaite, Joseph B Ciolino
PURPOSE: To test whether verteporfin with a nonthermal laser increases corneal mechanical stiffness and resistance to enzymatic degradation ex vivo. METHODS: Thirty human corneas (n = 5 per group) were treated with verteporfin alone (V), irradiated with nonthermal laser therapy (689 nm) alone (NTL), or received combined treatment of verteporfin with nonthermal laser therapy for 1 sequence (V+NTL1) or 6 sequences (V+NTL6) of 1 minute of NTL exposure. Positive controls were pretreated with 0...
November 22, 2017: Cornea
https://www.readbyqxmd.com/read/29171504/intraoperative-optical-coherence-tomography-to-evaluate-the-effect-of-the-eyelid-speculum-on-corneal-pachymetry-during-accelerated-corneal-cross-linking-9%C3%A2-mw-cm-2
#16
R Ghaffari, M Mortazavi, P Anvari, A Salamat Rad, F Alipour, F Hafezi, S Asgari, H Hashemi
PurposeTo investigate intraoperative anterior segment optical coherence tomography (AS-OCT) to compare pachymetry changes between two methods (group 1: speculum-on, group 2: speculum-off during riboflavin instillation stage) during corneal cross-linking /CXL) (9 mW/cm(2) for 10 min) in keratoconic patients.MethodsIn this interventional case series, 11 eyes (11 patients) in group 1 and 14 eyes (14 patients) in group 2 were enrolled. Pachymetry measurements by spectral domain OCT was performed at baseline, after epithelial removal, after 30 min of imbibition with riboflavin, and after UV irradiation...
November 24, 2017: Eye
https://www.readbyqxmd.com/read/29168276/established-and-novel-measures-of-upper-limb-impairment-in-children-with-charcot-marie-tooth-disease-type-1a-and-riboflavin-transporter-deficiency-type-2
#17
Kayla Cornett, Manoj P Menezes, Paula Bray, Mark Halaki, Joshua Burns
BACKGROUND: Hand function is a problem in patients with Charcot-Marie-Tooth disease type 1A (CMT1A) and Riboflavin Transporter Deficiency type 2 (RTD2). However, a detailed understanding of upper limb involvement in these conditions is lacking. The aim of this pilot study was to compare hand and upper limb function between children with CMT1A, RTD2 and healthy controls using established and novel outcome measures. METHODS: Three age-and sex-matched groups of four children (5-15 years, 1 male/group) with CMT1A, RTD2, and healthy controls were assessed for function, strength, and sensation...
November 23, 2017: Journal of the Peripheral Nervous System: JPNS
https://www.readbyqxmd.com/read/29165390/comparison-of-anionic-cationic-and-nonionic-surfactants-as-dispersing-agents-for-graphene-based-on-the-fluorescence-of-riboflavin
#18
Rocío Mateos, Soledad Vera, Mercedes Valiente, Ana María Díez-Pascual, María Paz San Andrés
Fluorescence quenching is a valuable tool to gain insight about dynamic changes of fluorophores in complex systems. Graphene (G), a single-layered 2D nanomaterial with unique properties, was dispersed in surfactant aqueous solutions of different nature: non-ionic polyoxyethylene-23-lauryl ether (Brij L23), anionic sodium dodecylsulphate (SDS), and cationic hexadecyltrimethylammonium bromide (CTAB) and dodecyltrimethylammonium bromide (DTAB). The influence of the surfactant type, chain length and concentration, G total concentration and G/surfactant weight ratio on the fluorescence intensity of vitamin B₂ (riboflavin) was investigated...
November 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29164668/ameliorative-effects-of-riboflavin-on-acetic-acid-induced-colonic-injury-in-rats
#19
Berna Karakoyun, Büşra Ertaş, Meral Yüksel, Dilek Akakın, Özge Çevik, Göksel Şener
Riboflavin (RF) has been found to be a promising antioxidant and/or anti-inflammatory agent in several studies. However, the effect of RF against acetic acid (AA)-induced colonic injury is currently unknown. This study aimed to investigate the potential antioxidant and protective effects of RF in a rat model of ulcerative colitis. Starting immediately after the colitis induction (AA+RF group) or 1 week before the colitis induction (RF+AA+RF group), the rats were treated with RF (25 mg/kg/d;p.o.) for 3 days...
November 22, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29163672/contribution-of-riboflavin-supply-pathways-to-vibrio-cholerae-in-different-environments
#20
Andrés Fuentes Flores, Ignacio Sepúlveda Cisternas, José Ignacio Vásquez Solis de Ovando, Alexia Torres, Víctor Antonio García-Angulo
Background: The waterborne diarrheagenic bacterium Vibrio cholerae, cause of the pandemic cholera disease, thrives in a variety of environments ranging from estuarine waters to the human intestinal tract. This species has two ways to obtain the essential micronutrient riboflavin, de novo biosynthesis and environmental uptake through the RibN importer. The way these functions interrelate to fulfill riboflavin needs in different conditions in this species is unknown. Results: This study analyzed the contributions of riboflavin biosynthesis and transport to the culturability of Vibrio cholerae in river and seawater in vitro and in the Caenorhabditis elegans nematode host model...
2017: Gut Pathogens
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