CML 10, a variant of calmodulin, modulates ascorbic acid synthesis
| Autor: | Ha Thi Kim Nguyen, Dong Hwa Cho, Seung Beom Hong, Kwang Moon Cho, Jeong Sheop Shin, Sung Han Ok, Soo Youn Kim, Jin Seok Shin |
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| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
0301 basic medicine Calmodulin Physiology Mutant Arabidopsis Ascorbic Acid Plant Science 01 natural sciences 03 medical and health sciences Gene Expression Regulation Plant Two-Hybrid System Techniques parasitic diseases Arabidopsis thaliana Protein Interaction Domains and Motifs Calcium signaling biology Arabidopsis Proteins Effector biology.organism_classification Ascorbic acid Oxidative Stress 030104 developmental biology Biochemistry Phosphotransferases (Phosphomutases) Mutation biology.protein Calcium Function (biology) 010606 plant biology & botany |
| Zdroj: | New Phytologist. 209:664-678 |
| ISSN: | 1469-8137 0028-646X |
| Popis: | Calmodulins (CaMs) regulate numerous Ca(2+) -mediated cellular processes in plants by interacting with their respective downstream effectors. Due to the limited number of CaMs, other calcium sensors modulate the regulation of Ca(2+) -mediated cellular processes that are not managed by CaMs. Of 50 CaM-like (CML) proteins identified in Arabidopsis thaliana, we characterized the function of CML10. Yeast two-hybrid screening revealed phosphomannomutase (PMM) as a putative interaction partner of CML10. In vitro and in vivo interaction assays were performed to analyze the interaction mechanisms of CML10 and PMM. PMM activity and the phenotypes of cml10 knock-down mutants were studied to elucidate the role(s) of the CML10-PMM interaction. PMM interacted specifically with CML10 in the presence of Ca(2+) through its multiple interaction motifs. This interaction promoted the activity of PMM. The phenotypes of cml10 knock-down mutants were more sensitive to stress conditions than wild-type plants, corresponding with the fact that PMM is an enzyme which modulates the biosynthesis of ascorbic acid, an antioxidant. The results of this research demonstrate that a calcium sensor, CML10, which is an evolutionary variant of CaM, modulates the stress responses in Arabidopsis by regulating ascorbic acid production. |
| Databáze: | OpenAIRE |
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