NDLI: Regulatory Properties of Phosphoenolpyruvate Carboxylase in Crassulacean Acid Metabolism Plants: Diurnal Changes in Phosphorylation State and Regulation of Gene Expression

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Regulatory Properties of Phosphoenolpyruvate Carboxylase in Crassulacean Acid Metabolism Plants: Diurnal Changes in Phosphorylation State and Regulation of Gene Expression

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Regulatory Properties of Phosphoenolpyruvate Carboxylase in Crassulacean Acid Metabolism Plants: Diurnal Changes in Phosphorylation State and Regulation of Gene Expression

Content Provider	Taylor & Francis Online
Author	Agarie, Sakae Theng, Vuthy Nose, Akihiro
Abstract	Regulatory properties of Phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) in three CAM species, Kalanchoë pinnata, K. daigremontiana and Ananas comosus (pineapple) were examined. PEPC activity in the leaves of the three CAM species exhibited diurnal changes peaking during the first 2-h of darkness in Kalanchoë species and at midnight in pineapple, and then decreasing drastically until dawn. The oscillations of PEPC activity were far greater in Kalanchoë species than in pineapple. In the presence of 2 mM malate, the activity of PEPC decreased in all three CAM species, but the sensitivity of PEPC to malate was markedly different between pineapple and the Kalanchoë species. The malate sensitivity was 2- to 3-times higher in pineapple than in the Kalanchoë species during the dark period, but it was almost the same during the light period. PEPC in the three CAM species was phosphorylated only during the dark period. PEPC proteins were highly phosphorylated during the first 2-h of darkness in Kalanchoë species and at midnight in pineapple, and then they decreased drastically during the latter part of darkness. CAM-specific isoforms of PEPC in the leaves of the three CAM species contained a highly conserved phosphorylation site of Ser-11 at the N-terminus. These PEPC isoforms displayed diurnal changes in transcript abundance, with the peak of transcripts occurring during the dark period. The day/night changes in PEPC transcript abundance were mirrored by changes in the PEPC protein and corresponding enzyme activity over the diurnal cycle. These findings suggest that the diurnal regulation in PEPC activity is determined by the amount of PEPC protein as well as the posttranslational control in these CAM species.
Starting Page	171
Ending Page	181
Page Count	11
File Format	PDF HTM / HTML
ISSN	1343943X 13491008
DOI	10.1626/pps.10.171
Journal	Plant Production Science
Volume Number	10
Issue Number	2
Language	English
Publisher	Taylor & Francis
Publisher Date	2015-12-03
Access Restriction	Open
Subject Keyword	Crassulacean acid metabolism (CAM) Malate sensitivity Phosphoenolpyruvate carboxylase (PEPC) Phosphorylation state Protein abundance Transcript abundance
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science

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