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Cyanobacterial glucokinase complements the glucose sensing role of Arabidopsis thaliana hexokinase 1
- Authors
- Ryu, Jee-Youn; Jeong, Seok-Won; Kim, Soo Youn; Ko, Yoonae; Yoon, Sukjoon; Choi, Sang-Bong; Park, Youn-Il
- Issue Date
- Sep-2008
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Arabidopsis; glucokinase; glucose sensing; Synechocystis
- Citation
- BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, v.374, no.3, pp 454 - 459
- Pages
- 6
- Journal Title
- BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
- Volume
- 374
- Number
- 3
- Start Page
- 454
- End Page
- 459
- ISSN
- 0006-291X
1090-2104
- Abstract
- Unlike Arabidopsis hexokinase (AtHXK) 1, cyanobacterial glucokinase (cGlk, Sll0593) from Synechocystis sp. PCC6803 does not function endogenously as a glucose sensor for glucose repression of photosynthesis-related genes such as psbA2, psbD2, rbcS, and rbcL. However, when cGlk was constitutively expressed in the cytosol of the glucose insensitive AtHXK 1 null mutant gin2-1, transgenic plants showed glucose sensitive phenotypes similar to those of wild type plants, namely glucose-induced decreases in Chl content and transcript levels of genes encoding Chl binding proteins (CAB1) and Rubisco small subunit (RBCS). Therefore, we suggest that cGlk's ability to complement glucose sensing activity in higher plants is attributable to the presence of cGlk-interacting proteins present in Arabidopsis, but absent in Synechocystis. (C) 2008 Elsevier Inc. All rights reserved.
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