Details

Autor(en) / Beteiligte

• Bagchi, S.N.
• Rai, A.N.
• Singh, H.N.

Titel

Regulation of nitrate reductase in cyanobacteria. Repression-derepression control of nitrate reductase apoprotein in the cyanobacterium Nostoc muscorum

Ist Teil von

• Biochimica et biophysica acta. General subjects, 1985-01, Vol.838 (3), p.370-373

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

1985

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• The repression-derepression control of Nostoc muscorum nitrate reductase was studied with regard to the Mo-cofactor and apoprotein levels. It was found that the synthesis of Mo-cofactor is constitutive but the apoprotein is subject to the repression-derepression control. In NH 4 + medium apoprotein synthesis was repressed and in N 2 and NO 3 − media apoprotein synthesis was derepressed. The apoprotein levels were similar in NO 3 − and N 2 media; however, the nitrate reductase activity was lower in N 2 medium due to lower Mo-cofactor activity. The lower Mo-cofactor activity in N 2-fixing conditions as compared to that in non-N 2-fixing conditions was consistent with the earlier view that the Mo-cofactor of nitrate reductase may be a precursor for FeMo-cofactor of nitrogenase.