نتایج جستجو برای: dihydrofolate reductase dhfr
تعداد نتایج: 44537 فیلتر نتایج به سال:
The internal dynamics of native and immobilized Escherichia coli dihydrofolate reductase (DHFR) have been examined using incoherent quasielastic neutron scattering. These results reveal no difference between the high frequency vibration mean-square displacement of the native and the immobilized E. coli DHFR. However, length-scale-dependent, picosecond dynamical changes are found. On longer leng...
Artificially aminoacylated suppressor tRNAs were used to introduce photoreactive amino acids into model mitochondrial precursor proteins to probe the environment along the protein import pathway. Amino acids with benzophenone side chains of various lengths [DL-2-amino-3-(p-benzoylphenyl)propanoic acid (1) and DL-2-amino-5-(p-benzoylphenyl)pentanoic acid (2)] were incorporated at specific sites ...
The Brotowali plant is used to treat malaria. Tinospora crispa L contains active compounds that are good for health and has been widely medicine. Crude extract from can be as target dihydrofolate reductase-thymidylate synthase (DHFR-TS). This research study was analyse the potential chemical content of in form columbine a focus malaria therapy through inhibition In silico method, (CID: 188289) ...
Malarial dihydrofolate reductase (DHFR) is the target of antifolate antimalarial drugs such as pyrimethamine and cycloguanil, the clinical efficacy of which have been compromised by resistance arising through mutations at various sites on the enzyme. Here, we describe the use of cocrystal structures with inhibitors and substrates, along with efficacy and pharmacokinetic profiling for the design...
Dihydrofolate reductase (DHFR) is often used as a model system to study the relation between protein dynamics and catalysis. We have studied a number of variants of the cold-adapted DHFR from Moritella profunda (MpDHFR), in which the catalytically important M20 and FG loops have been altered, and present a comparison with the corresponding variants of the well-studied DHFR from Escherichia coli...
We investigated the cell cycle modulation of dihydrofolate reductase (DHFR; tetrahydrofolate dehydrogenase, 7,8-dihydroxyfolate:NADP+ oxidoreductase, EC 1.5.1.3) levels in methotrexate-resistant Chinese hamster ovary cells synchronized by mitotic selection. DNA content and DHFR concentration were analyzed throughout the cell cycle by standard biochemical techniques and by double fluorescence st...
Tetrahyrobiopterin (BH4) is a required cofactor for the synthesis of nitric oxide by endothelial nitric oxide synthase (eNOS) and BH4 bioavailability within the endothelium is a critical factor in regulating the balance between NO and superoxide production by eNOS (eNOS coupling). BH4 levels are determined by the activity of GTP cyclohydrolase I (GTPCH), the rate-limiting enzyme in de novo BH4 ...
BACKGROUND Monitoring the prevalence of drug resistant Plasmodium falciparum is essential for effective malaria control. Resistance to pyrimethamine and sulfadoxine increases as mutations accumulate in the parasite genes encoding dihydrofolate reductase (dhfr) and dihydropteroate synthase (dhps), respectively. Although parasites are exposed to these antifolate drugs simultaneously, it remains v...
KONISHI, Y., KANAMARU, R., IsHIoKA, C., ISHIKAWA, ., SHIBATA, H., WAKUI, A. and DEI, T. The Changes in the Levels of Dihydrofolate Reductase mRNA and Its Gene Dosage in 5-Fluorouracil-Resistant L1210 Cells. Tohoku J. Exp. Med., 1990, 161(1), 33-42 5-Fluorouracil (5-FU)-resistant L1210 cell line (L1210/ 5-FU-1) was established in this laboratory, and maintained by serial passage in the peritonea...
The phenotypes of single- (SKO) and double-knockout (DKO) lines of dihydrofolate reductase-thymidylate synthase (DHFR-TS) of bloodstream Trypanosoma brucei were evaluated in vitro and in vivo. Growth of SKO in vitro is identical to wild-type (WT) cells, whereas DKO has an absolute requirement for thymidine. Removal of thymidine from the medium triggers growth arrest in S phase, associated with ...
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