Isolation and characterization of Glyceraldehyde-3-phosphate dehydrogenase from the common octopus (Octopus vulgaris Cuvier, 1797)

The NAD⁺ dependent cytosolic Glyceraldehyde-3-phosphate dehydrogenase (GAPDH, EC 1.2.1.12) from arms of Octopus vulgaris, Cuvier, 1787, (Octopoda, Cephalopoda) was purified to homogeneity and its kinetic properties investigated. The purification method consisted of ammonium sulfate fractionation fol...

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Veröffentlicht in:Reviews in fish biology and fisheries 2008-08, Vol.18 (3), p.263-271
Hauptverfasser: Oukhattar, Laila, Baibai, Tarik, Moutaouakkil, Adnane, Assobhei, Omar, Soukri, Abdelaziz
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container_start_page 263
container_title Reviews in fish biology and fisheries
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creator Oukhattar, Laila
Baibai, Tarik
Moutaouakkil, Adnane
Assobhei, Omar
Soukri, Abdelaziz
description The NAD⁺ dependent cytosolic Glyceraldehyde-3-phosphate dehydrogenase (GAPDH, EC 1.2.1.12) from arms of Octopus vulgaris, Cuvier, 1787, (Octopoda, Cephalopoda) was purified to homogeneity and its kinetic properties investigated. The purification method consisted of ammonium sulfate fractionation followed by Blue Sepharose CL-6B chromatography resulting in a 26-fold increase in specific activity and a final yield of approximately 16%. The apparent molecular weight of the purified native enzyme was 153 kDa. The protein is an homotetramer, composed of identical subunits with an apparent molecular weight of approximately 36 kDa. The Michaelis constants Km for both NAD⁺ and d-G3P were 66 μM and 320 μM, respectively. The maximal velocity Vmax of the purified enzyme was estimated to be 21.8 U/mg. Only one GAPDH isoform (pI 6.6) was obtained by isoelectrofocusing in polyacrylamide slab gels holding ampholyte generated pH gradients. Under the conditions of assay, the optimum activity occurs at pH 7.0 and at temperature of 35°C. Polyclonal antibodies raised in rabbits against the purified GAPDH immunostained a single 36 kDa GAPDH band on crude extract protein preparations blotted onto nitrocellulose.
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The purification method consisted of ammonium sulfate fractionation followed by Blue Sepharose CL-6B chromatography resulting in a 26-fold increase in specific activity and a final yield of approximately 16%. The apparent molecular weight of the purified native enzyme was 153 kDa. The protein is an homotetramer, composed of identical subunits with an apparent molecular weight of approximately 36 kDa. The Michaelis constants Km for both NAD⁺ and d-G3P were 66 μM and 320 μM, respectively. The maximal velocity Vmax of the purified enzyme was estimated to be 21.8 U/mg. Only one GAPDH isoform (pI 6.6) was obtained by isoelectrofocusing in polyacrylamide slab gels holding ampholyte generated pH gradients. Under the conditions of assay, the optimum activity occurs at pH 7.0 and at temperature of 35°C. 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Polyclonal antibodies raised in rabbits against the purified GAPDH immunostained a single 36 kDa GAPDH band on crude extract protein preparations blotted onto nitrocellulose.</abstract><cop>Dordrecht</cop><pub>Dordrecht : Springer Netherlands</pub><doi>10.1007/s11160-007-9074-6</doi><tpages>9</tpages></addata></record>
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1573-5184
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subjects Ammonium
Biomedical and Life Sciences
Cephalopoda
Characterization
Chromatography
Dehydrogenase
Dehydrogenases
Enzyme kinetics
Enzymes
Fisheries
Fractionation
Freshwater & Marine Ecology
glyceraldehyde-3-phosphate dehydrogenase
Glycerol
Kinetics
Life Sciences
Marine
Marine biology
Molecular weight
Octopoda
Octopus vulgaris
Proteins
purification
Research Paper
Studies
Zoology
title Isolation and characterization of Glyceraldehyde-3-phosphate dehydrogenase from the common octopus (Octopus vulgaris Cuvier, 1797)
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