l-Methionine-dl-sulfoximine resistant Het+ Nif+ and Het− Nif− strains of Nostoc muscorum assimilating methylamine as ammonium nitrogen source |
| |
Authors: | HN Singh SN Bagchi RK Singh |
| |
Institution: | School of Life Sciences, University of Hyderabad, Hyderabad - 500 134, India |
| |
Abstract: | Abstract The Het+ Nif+ and Het? Nif? strains of Nostoc muscorum sensitive to growth inhibition by methylamine (MA), overcame the MA inhibition as a result of their mutation to l -methionine- dl -sulfoximide (MSX)-resistant phenotype, which enabled them to assimilate MA like an ammonium nitrogen source. The MSX-resistant Het+ Nif+ strain synthesized the inhibitor-resistant transferase-defective glutamine synthetase (GS), which unlike parental GS underwent MA-dependent in vivo activation. These results suggest the involvement of GS enzyme in control of MA assimilation in cyanobacteria. |
| |
Keywords: | Cyanobacteria MSX-resistant GS MA assimilation N2-fixation and heterocyst formation |
本文献已被 ScienceDirect 等数据库收录! |