Biochemical and molecular characterization of the NAD+-dependent isocitrate dehydrogenase from the chemolithotrophAcidithiobacillus thiooxidans
نویسندگان
چکیده
منابع مشابه
Purification and characterization of NAD-isocitrate dehydrogenase from chlamydomonas reinhardtii
NAD-isocitrate dehydrogenase (NAD-IDH) from the eukaryotic microalga Chlamydomonas reinhardtii was purified to electrophoretic homogeneity by successive chromatography steps on Phenyl-Sepharose, Blue-Sepharose, diethylaminoethyl-Sephacel, and Sephacryl S-300 (all Pharmacia Biotech). The 320-kD enzyme was found to be an octamer composed of 45-kD subunits. The presence of isocitrate plus Mn2+ pro...
متن کاملArabidopsis NAD-dependent isocitrate dehydrogenase mutants
NAD-dependent isocitrate dehydrogenase (IDH) is a TCA cycle enzyme that produces 2oxoglutarate, an organic acid required by the glutamine synthetase/glutamate synthase cycle to assimilate ammonium. Three Arabidopsis IDH mutants have been characterized, corresponding to an insertion into a different IDH gene (At5g03290, idhv; At4g35260, idhi; At2g17130, idhii). Analysis of IDH mRNA and protein s...
متن کاملMolecular mechanism of the allosteric regulation of the αγ heterodimer of human NAD-dependent isocitrate dehydrogenase
Human NAD-dependent isocitrate dehydrogenase catalyzes the decarboxylation of isocitrate (ICT) into α-ketoglutarate in the Krebs cycle. It exists as the α2βγ heterotetramer composed of the αβ and αγ heterodimers. Previously, we have demonstrated biochemically that the α2βγ heterotetramer and αγ heterodimer can be allosterically activated by citrate (CIT) and ADP. In this work, we report the cry...
متن کاملNAD-Linked Isocitrate Dehydrogenase: Isolation, Purification, and Characterization of the Protein from Pea Mitochondria.
The NAD(+)-dependent isocitrate dehydrogenase from etiolated pea (Pisum sativum L.) mitochondria was purified more than 200-fold by dye-ligand binding on Matrix Gel Blue A and gel filtration on Superose 6. The enzyme was stabilized during purification by the inclusion of 20% glycerol. In crude matrix extracts, the enzyme activity eluted from Superose 6 with apparent molecular masses of 1400 +/-...
متن کاملMembrane-Associated NAD-Dependent Isocitrate Dehydrogenase in Potato Mitochondria.
The oxidation isotherms for citrate and isocitrate by potato (Solanum tuberosum var. Russet Burbank) mitochondria in the presence of NAD differ markedly. Citrate oxidation shows positively cooperative kinetics with a sigmoid isotherm, whereas isocitrate oxidation shows Michaelis-Menten kinetics at concentrations up to 3 millimolar, and cooperative kinetics thereafter up to 30 millimolar. In the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: FEMS Microbiology Letters
سال: 2002
ISSN: 0378-1097,1574-6968
DOI: 10.1111/j.1574-6968.2002.tb11335.x