Glutamine synthetase specific activity and protein concentration in symbiotic Anabaena associated with Azolla caroliniana |
| |
Authors: | K Y Lee C M Joseph J C Meeks |
| |
Institution: | (1) Dept. of Bacteriology, University of California, 95616 Davis, CA, USA;(2) Present address: Dept. of Agronomy and Range Science, University of California, 95616 Davis, CA, USA |
| |
Abstract: | Glutamine synthetase (GS) is the primary NH4
+ assimilating enzyme of cyanobacteria. The specific activities and cellular protein concentration of GS in symbiotic cyanobacteria associated with the water fern Azolla caroliniana were determined and compared to free-living cultures of Nostoc sp. strain 7801, a strain originally isolated from symbiotic association with the bryophyte Anthoceros punctatus. Both the in vitro specific activity and concentration of GS in symbiotic cyanobacteria separated from A. caroliniana were approximately 3-fold lower than the free-living Nostoc sp. strain 7801 culture. These results imply depressed synthesis of GS by the symbiont associated with A. caroliniana. |
| |
Keywords: | Anabaena Azolla glutamine synthetase Nostoc symbiosis |
本文献已被 SpringerLink 等数据库收录! |