Results 71 to 80 of about 232,755 (310)

CCS2, an Octatricopeptide-Repeat Protein, Is Required for Plastid Cytochrome c Assembly in the Green Alga Chlamydomonas reinhardtii

Frontiers in Plant Science, 2017
In bacteria and energy generating organelles, c-type cytochromes are a class of universal electron carriers with a heme cofactor covalently linked via one or two thioether bonds to a heme binding site. The covalent attachment of heme to apocytochromes is
Sara G. Cline, Sara G. Cline, Isaac A. Laughbaum, Patrice P. Hamel, Patrice P. Hamel   +4 more
doaj   +1 more source

G-quadruplexes sequester free heme in living cells

bioRxiv, 2019
Heme is an essential cofactor for many enzymes, but free heme is toxic and its levels are tightly regulated. G-quadruplexes bind heme avidly in vitro, raising the possibility that they may sequester heme in vivo. If so, then treatment that displaces heme
Lucas T Gray, Emilia Puig Lombardi, D. Verga, C. Guetta, A. Nicolas, M. Teulade‐Fichou, A. Londoño-Vallejo, N. Maizels   +7 more
semanticscholar   +1 more source

Hierarchically Engineered Multi‐Enzyme Nanoreactors for in vitro Drug Biosynthesis and Pathway Transplantation Into Cells

Advanced Materials, EarlyView.
A hierarchically structured metal–organic framework (eMIL) is shown to host the complete six‐enzyme biosynthesis pathway for the anti‐cancer pigment violacein, reshaping reaction dynamics and multiplying in vitro yields. eMIL nanoreactors deliver this reconstituted bacterial multi‐protein system into mammalian cells, where cell‐derived substrates and ...
Ainur Sharip, Somayah S. Qutub, Manar M. Farooqui, Walaa Baslyman, Nida Khalfay, Lukman O. Alimi, Patricia Lopez Sanchez, Lingyun Zhao, Milena Chernyshevskaia, Giovanni Colombo, Niveen M. Khashab, Stefan T. Arold, Raik Grünberg   +12 more
wiley   +1 more source

Resistance of Nitric Oxide Dioxygenase and Cytochrome c Oxidase to Inhibition by Nitric Oxide and Other Indications of the Spintronic Control of Electron Transfer

Biophysica
Heme enzymes that bind and reduce O2 are susceptible to poisoning by NO. The high reactivity and affinity of NO for ferrous heme produces stable ferrous-NO complexes, which in theory should preclude O2 binding and turnover.
Paul R. Gardner
doaj   +1 more source

The GluTR-binding protein is the heme-binding factor for feedback control of glutamyl-tRNA reductase

eLife, 2019
Synthesis of 5-aminolevulinic acid (ALA) is the rate-limiting step in tetrapyrrole biosynthesis in land plants. In photosynthetic eukaryotes and many bacteria, glutamyl-tRNA reductase (GluTR) is the most tightly controlled enzyme upstream of ALA.
Andreas S Richter, Claudia Banse, Bernhard Grimm   +2 more
doaj   +1 more source

Heme Catabolic Pathway in Inflammation and Immune Disorders

Frontiers in Pharmacology, 2019
In recent years, the heme catabolic pathway is considered to play an important regulatory role in cell protection, apoptosis, inflammation, and other physiological and pathological processes.
B. Wu, Yan-wei Wu, Wei Tang
semanticscholar   +1 more source

Engineered Heparinized GQDS/HPEI–Polyamide Membrane for Bilirubin Removal via One Step Anti Coagulation

Advanced Materials Interfaces, EarlyView.
A multifunctional heparinized polyamide membrane embedded with graphene quantum dots (GQDs) and hyperbranched polyethyleneimine (HPEI) is engineered for efficient bilirubin removal via a one‐step anticoagulation–adsorption process. The membrane demonstrates enhanced hemocompatibility, prolonged clotting times, and high bilirubin adsorption capacity ...
Abdur Rehman Mushtaq Ahmad, Maria Wasim, Aneela Sabir, Muhammad Shafiq, Syed Abdul Basit Shah, Maoz Maoz, Vanni Lughi   +6 more
wiley   +1 more source

Light-induced depigmentation in planarians models the pathophysiology of acute porphyrias

eLife, 2016
Porphyrias are disorders of heme metabolism frequently characterized by extreme photosensitivity. This symptom results from accumulation of porphyrins, tetrapyrrole intermediates in heme biosynthesis that generate reactive oxygen species when exposed to ...
Bradford M Stubenhaus, John P Dustin, Emily R Neverett, Megan S Beaudry, Leanna E Nadeau, Ethan Burk-McCoy, Xinwen He, Bret J Pearson, Jason Pellettieri   +8 more
doaj   +1 more source

Endothelial Barrier Integrity Is Disrupted In Vitro by Heme and by Serum From Sickle Cell Disease Patients

Frontiers in Immunology, 2020
Free extracellular heme has been shown to activate several compartments of innate immunity, acting as a danger-associated molecular pattern (DAMP) in hemolytic diseases.
Vanessa Araujo Gomes Santaterra, Maiara Marx Luz Fiusa, Bidossessi Wilfried Hounkpe, Francine Chenou, Wouitchekpo Vincent Tonasse, Loredana Nilkenes Gomes da Costa, Loredana Nilkenes Gomes da Costa, Diego Garcia-Weber, Igor de Farias Domingos, Igor de Farias Domingos, Franciele de Lima, Ivanio Teixeira Borba-Junior, Aderson da Silva Araújo, Antonio Roberto Lucena-Araújo, Marcos André Cavalcante Bezerra, Magnun Nueldo Nunes dos Santos, Fernando Ferreira Costa, Fernando Ferreira Costa, Jaime Millán, Erich Vinicius De Paula, Erich Vinicius De Paula   +20 more
doaj   +1 more source

Circadian Genes Expression Patterns in Disorders Due to Enzyme Deficiencies in the Heme Biosynthetic Pathway

Biomedicines, 2022
Heme is a member of the porphyrins family of cyclic tetrapyrroles and influences various cell processes and signalling pathways. Enzyme deficiencies in the heme biosynthetic pathway provoke rare human inherited metabolic diseases called porphyrias ...
Maria Savino, Claudio Carmine Guida, Maria Nardella, Emanuele Murgo, Bartolomeo Augello, Giuseppe Merla, Salvatore De Cosmo, Antonio Fernando Savino, Roberto Tarquini, Francesco Cei, Filippo Aucella, Gianluigi Mazzoccoli   +11 more
doaj   +1 more source