Dehydrogenase

Tóm tắt Luận án Tiến sĩ Y học "Nghiên cứu đột biến gen G6PD ở một số dân tộc miền Bắc Việt Nam" được nghiên cứu với mục tiêu là: Xác định đột biến của gen G6PD ở bệnh nhân thiếu hụt enzyme G6PD thuộc một số dân tộc miền Bắc Việt Nam bằng kỹ thuật giải trình tự gen; Phân tích đột biến gen G6PD ở một số gia đình bệnh nhi thiếu hụt của nhóm nghiên cứu.

27p vimulcahy 02-10-2023 9 4   Download

Bài giảng Thiếu men G6PD giúp bạn hiểu thêm về bệnh thiếu men G6PD, tần suất mắc bệnh thiếu G6PD, nguy cơ mắc bệnh, phòng ngừa hậu quả của thiếu men G6PD, các loại thuốc cần tránh dùng cho người bệnh thiếu G6PD,... Mời các bạn cùng tham khảo!

18p gongyuefei 10-08-2021 19 2   Download

Nội dung nghiên cứu của luận án là khảo sát ảnh hưởng của LXN và RMK đến các enzyme chuyển hóa carbohydrate gồm các enzyme là glucose-6-phosphatase (G6Pase), glucose-6- phosphate dehydrogenase (G6PDH) và lactate dehydrogenase (LDH) in vitro. Khảo sát khả năng chống stress oxy hóa và bảo vệ tế bào tụy tạng min6 khỏi sự chết do tunicamycin gây ra của LXN và RMK.

19p elysale 09-06-2021 15 2   Download

Đề tài nghiên cứu nhằm 2 mục tiêu: Xác định tỷ lệ nhiễm ký sinh trùng sốt rét tại một số điểm điều tra của tỉnh Đăk Nông năm 2017; xác định tỷ lệ thiếu G6PD của người dân sống trong vùng sốt rét lưu hành tại điểm điều tra.

70p capheviahe27 23-02-2021 20 4   Download

Porcine heart cytoplasmic malate dehydrogenase (s-MDH) is a dimeric protein (2 · 35 kDa). We have studied equilibrium unfolding and refolding of s-MDH using activity assay, fluorescence, far-UV and near-UV circular dichroism (CD) spectroscopy, hydrophobic probe-1-anilino8-napthalene sulfonic acid binding, dynamic light scattering, and chromatographic (HPLC) techniques. The unfolding and refolding transitions are reversible and show the presence of two equilibrium intermediate states.

11p system191 01-06-2013 38 4   Download

Recent years have witnessed high levels of activity in identifying enzyme systems that catalyse H-transfer by quantum tunneling. Rather than being restricted to a small number of specific enzymes as perceived initially, it has now become an accepted mechanism for H-transfer in a growing number of enzymes. Furthermore, H-tunneling is driven by the thermally induced dynamics of the enzyme. In some of those enzymes that break stable C–H bonds the reaction proceeds purely by quantum tunneling, without the need to partially ascend the barrier.

7p system191 01-06-2013 40 3   Download

To examine functions of two small heat shock proteins of Escherichia coli, IbpA and IbpB, we constructed His–IbpA and His–IbpB, in which a polyhistidine tag was fused to the N-terminals. Both purified His–IbpA and His–IbpB formed multimers, which have molecular masses of about 2.0– 3.0 MDa and consist of about 100–150 subunits.

11p system191 01-06-2013 41 4   Download

The involvement of the lysine residue present at the active site of Ehrlich ascites carcinoma (EAC) cell glyceraldehyde-3-phosphate dehydrogenase (Gra3P DH) was investigated by using the lysine specific reagents trinitrobenzenesulfonic acid (TNBS) and pyridoxal phosphate (PP). Both TNBS and PP inactivated EAC cell Gra3P DH with pseudo-first-order kinetics with the rate dependent on modifier concentration. Kinetic analysis, including a Tsou plot, indicated that both TNBS and PP apparently react with one lysine residue per enzyme molecule.

8p system191 01-06-2013 37 3   Download

We previously reported that GTS1 is involved in regulating ultradian oscillations of the glycolytic pathway induced by cyanide in cell suspensions as well as oscillations of energy metabolism in aerobic continuous cultures. Here, we screened a yeast cDNA library for proteins that bind to Gts1p using the yeast two-hybrid system and cloned multiple TDH cDNAs encoding the glycolytic enzyme glyceraldehyde-3-phosphate dehydrogenase (GAPDH).

10p research12 01-06-2013 40 3   Download

Cloning and over-expression of human glucose 6-phosphate dehydrogenase (Glc6P dehydrogenase) has for the first time allowed a detailed kinetic study of a preparation that is genetically homogeneous and in which all the protein molecules are of identical age. The steady-state kinetics of the recombinant enzyme, studied by fluorimetric initial-rate measurements, gave converging linear Lineweaver–Burk plots as expected for a ternary-complex mechanism.

8p research12 01-06-2013 59 4   Download

A cytosolic thyroid-hormone-binding protein (xCTBP), predominantly responsible for the major binding activity of T3 in the cytosol of Xenopus liver, has been shown to be identical to aldehyde dehydrogenase class 1 (ALDH1) [Yamauchi, K., Nakajima, J., Hayashi, H., Horiuchi, R. & Tata, J.R. (1999) J. Biol. Chem. 274, 8460–8469]. Within this paper we surveyed which signaling, and other, compounds affect the thyroid hormone binding activity and aldehyde dehydrogenase activity of recombinant Xenopus ALDH1 (xCTBP/xALDH1) while examining the relationship between these two activities....

8p research12 01-06-2013 38 4   Download

The ÔMediterraneanÕ variant of glucose-6-phosphate dehydrogenase (G6PD) deficiency is due to the C563CT point mutation, leading to replacement of Ser with Phe at position 188, resulting in acute haemolysis triggered by oxidants. Previous work has shown increased formation of altered aspartate residues in membrane proteins during cell ageing and in response to oxidative stress in normal erythrocytes. These abnormal residues are specifically recognized by the repair enzyme L-isoaspartate (D-aspartate) protein O-methyltransferase (PCMT; EC 2.1.1.77). ...

8p research12 01-06-2013 38 4   Download

A gene having high sequence homology (45–49%) with the glycerol-1-phosphate dehydrogenase gene from Methanobacterium thermoautotrophicum was cloned from the aerobic hyperthermophilic archaeon Aeropyrum pernix K1 (JCM 9820). This gene expressed in Escherichia coli with the pET vector system consists of 1113 nucleotides with an ATG initiation codon and a TAG termination codon. The molecular mass of the purified enzyme was estimated to be 38 kDa by SDS/PAGE and 72.4 kDa by gel column chromatography, indicating presence as a dimer....

8p research12 01-06-2013 27 4   Download

The Phycomyces blakesleeanus wild-type is yellow, because it accumulates b-carotene as the main carotenoid. A new carotenoid mutant of this fungus (A486) was isolated, after treatment with ethyl methane sulfonate (EMS), showing a whitish coloration. It accumulates large amounts of phytoene, small quantities of phyto¯uene, f-carotene and neurosporene, in decreasing amounts, and traces of b-carotene. This phenotype indicates that it carries a leaky mutation a€ecting the enzyme phytoene dehydrogenase (EC 1.3.-.-), which is speci®ed by the gene carB....

7p research12 01-06-2013 45 5   Download

Alcohol dehydrogenase (ADH) deficiency results in decreased retinol utilization, but it is unclear what physio-logical roles the several known ADHs play in retinoid signaling. Here, Adh1, Adh3,andAdh4null mutant mice have been examined following acute and chronic vitamin A excess. Following an acute dose of retinol (50 mgÆkg )1 ), metabolism of retinol to retinoic acid in liver was reduced 10-fold inAdh1mutants and 3.8-fold inAdh3mutants, but was not significantly reduced inAdh4mutants.

6p research12 29-04-2013 52 3   Download

Pyruvate dehydrogenase kinase (PDK) is the primary regulator of flux through the mitochondrial pyruvate dehy-drogenase complex (PDC).Analysis of the primary amino-acid sequences of PDK from various sources reveals that these enzymes include the five domains characteristic of prokaryotic two-component His-kinases, despite the fact that PDKexclusivelyphosphorylates Ser residues in theE1a subunit of the PDC.This seeming contradiction might be resolved if the PDK-catalyzed reaction employed a phos-pho-His intermediate....

6p research12 29-04-2013 45 4   Download

To gain better insight into the insulin secretory activity of fetalbcells in response to glucose, the expression of glucose transporter 2 (GLUT-2), glucokinase and mitochondrial glycerol phosphate dehydrogenase (mGDH) were studied. Expression ofGLUT-2mRNA and protein in pancreatic islets and liver was signi®cantly lower in fetal and suckling rats than in adult rats.

9p research12 29-04-2013 47 4   Download

Mammalian alcohol dehydrogenases (ADH) 3 form a com-plex enzyme system based on amino-acid sequence, func-tional properties, and gene expression pattern. At least four mouseAdhgenes are known to encode di€erent enzyme classes that share less than 60% amino-acid sequence iden-tity. Two ADH-containing and overlapping C57BL/6 bacterial arti®cial chromosome clones, RP23-393J8 and -463H24, were identi®ed in a library screen, physically mapped, and sequenced.

9p research12 29-04-2013 22 2   Download

The present study reports the first purification and kinetic characterization of two plant arogenate dehydrogenases (EC 1.3.1.43), an enzyme that catalyses the oxidative decarboxylation of arogenate into tyrosine in presence of NADP. The twoArabidopsis thalianaarogenate dehy-drogenases TyrAAT1 and TyrAAT2 were overproduced in Escherichia coliand purified to homogeneity. Bio-chemical comparison of the two forms revealed that at low substrate concentration TyrAAT1 is four times more efficient in catalyzing the arogenate dehydrogenase reac-tion than TyrAAT2. ...

9p research12 23-04-2013 47 4   Download

Short-chaindehydrogenases/reductases (SDRs) are enzymes of great functional diversity. Even at sequence identities of typically only 15–30%, specific sequence motifs are detect-able, reflecting common folding patterns. We have devel-oped a functional assignment scheme based on these motifs and we find five families. Two of these families were known previously and are called
classical and
extended families, but they are now distinguished at a further level based on coenzyme specificities.

9p research12 23-04-2013 38 3   Download