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8 Sonuçlar
Structural basis for pterin antagonism in nitric-oxide synthase. Development of novel 4-oxo-pteridine antagonists of (6R)-5,6,7,8-tetrahydrobiopterin.
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Pathological nitric oxide (NO) generation in sepsis, inflammation, and stroke may be therapeutically controlled by inhibiting NO synthases (NOS). Here we targeted the (6R)-5,6,7,8-tetrahydro-l-biopterin (H(4)Bip)-binding site of NOS, which, upon cofactor binding, maximally increases enzyme activity
Reaction of N-hydroxyguanidine with the ferrous-oxy state of a heme peroxidase cavity mutant: a model for the reactions of nitric oxide synthase.
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Yeast cytochrome c peroxidase was used to construct a model for the reactions catalyzed by the second cycle of nitric oxide synthase. The R48A/W191F mutant introduced a binding site for N-hydroxyguanidine near the distal heme face and removed the redox active Trp-191 radical site. Both the R48A and
Multiple ligand-binding modes in bacterial R67 dihydrofolate reductase.
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R67 dihydrofolate reductase (DHFR), a bacterial plasmid-encoded enzyme associated with resistance to the drug trimethoprim, shows neither sequence nor structural homology with the chromosomal DHFR. It presents a highly symmetrical toroidal structure, where four identical monomers contribute to the
Using computational docking and virtual screening techniques the characterization of the Trypanosoma brucei pteridine reductase active-site.
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Human African trypanosomiasis is a fatal disease prevalent in approximately 36 sub-Saharan countries. Emerging reports of drug resistance in Trypanosoma brucei are a serious cause of concern as only limited drugs are available for the treatment of the disease. Pteridine reductase is an enzyme of
Tetrahydrobiopterin in intestinal lumen: its absorption and secretion in the small intestine and the elimination in the large intestine.
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In treating hereditary deficiency of tetrahydrobiopterin (BH(4)), supplementation with BH(4) might be the ultimate choice of therapy. Oral administration of BH(4) has been believed to be inefficient owing to poor absorption of BH(4) in the intestine. In this study, we found a considerable amount of
Contributions of orientation and hydrogen bonding to catalysis in Asn229 mutants of thymidylate synthase.
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We have determined structures of binary and ternary complexes of five Asn229 variants of thymidylate synthase (TS) and related their structures to the kinetic constants measured previously. Asn229 forms two hydrogen bonds to the pyrimidine ring of the substrate 2'-deoxyuridine-5'-monophosphate
Evolution of clitellate phaosomes from rhabdomeric photoreceptor cells of polychaetes - a study in the leech Helobdella robusta (Annelida, Sedentaria, Clitellata).
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BACKGROUND
In Annelida two types of photoreceptor cells (PRCs) are regarded as generally present, rhabdomeric and ciliary PRCs. In certain taxa, however, an additional type of PRC may occur, the so called phaosomal PRC. Whereas the former two types of PRCs are always organized as an epithelium with
Identification of transport-critical residues in a folate transporter from the folate-biopterin transporter (FBT) family.
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The Synechocystis Slr0642 protein and its plastidial Arabidopsis (Arabidopsis thaliana) ortholog At2g32040 belong to the folate-biopterin transporter (FBT) family within the major facilitator superfamily. Both proteins transport folates when expressed in Escherichia coli. Because the structural
Bilim tarafından desteklenen en eksiksiz şifalı otlar veritabanı
- 55 dilde çalışır
- Bilim destekli bitkisel kürler
- Görüntüye göre bitki tanıma
- Etkileşimli GPS haritası - bölgedeki bitkileri etiketleyin (yakında)
- Aramanızla ilgili bilimsel yayınları okuyun
- Şifalı bitkileri etkilerine göre arayın
- İlgi alanlarınızı düzenleyin ve haber araştırmaları, klinik denemeler ve patentlerle güncel kalın
Bir belirti veya hastalık yazın ve yardımcı olabilecek bitkiler hakkında bilgi edinin, bir bitki yazın ve karşı kullanıldığı hastalıkları ve semptomları görün.
* Tüm bilgiler yayınlanmış bilimsel araştırmalara dayanmaktadır
