6533b86efe1ef96bd12cc703
RESEARCH PRODUCT
Molecular Composition of Glutamine Synthetase of Sinapis alba L.
Aloysius WildMatthias HöpfnerGeorg Reifferscheidsubject
GlutamineChloroplastchemistry.chemical_compoundMolecular compositionBiochemistryGlufosinatechemistrybiologyGlutamine synthetaseSinapisbiology.organism_classificationGeneral Biochemistry Genetics and Molecular BiologyEnzyme structuredescription
Chloroplastic glutamine synthetase of Sinapis alba, purified to homogeneity by a simple three step procedure, revealed a molecular weight of about 395 kDa. The native enzyme is composed of eight subunits of identical molecular weight (about 50 kDa (each), although isoelectrofocusing yielded six distinct bands in the pH 5.6 region of the gel. Labelling of the enzyme with the glutamate analogue herbicide [14C]phosphinothricin and with [γ-32P]ATP indicated that glutamine synthetase has eight reactive centers per molecule. The native enzyme dissociated into two enzymatically active subaggregates of about 195 kDa after Mg2+ deprivation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1988-04-01 | Zeitschrift für Naturforschung C |