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NADP+‐malate dehydrogenase in C3‐plants: Regulation and role of a light‐activated enzyme
Abstract
The thioredoxin‐dependent light/dark modulation system of the chloroplast is described as a prerequisite enabling the flexible control of fluxes through the various parts of the CO 2‐fixation pathway. Both the rapid turnover of the reduced thiol‐containing form of the respective target enzyme, and the metabolite effect upon the reductive enzyme modulation, allow rapid adjustment of the amount of active species to the actual requirements. The structural basis of the regulation of chloroplast NADP+‐malate dehydrogenase (EC 1.1.1.82) is described in more detail. The modulable plastid enzyme is characterized by two sequence extensions not present in any other known NADP+‐ and/or NAD+‐specific malate dehydrogenase. The NADP+‐malate dehydrogenase of C 3‐plants is part of the “malate valve”, which catalyzes the export of reducing equivalents in the form of malate from the chloroplast only when the NADPH to NADP+ ratio is high, thus poising the NADPH to ATP ratio required for optimal carbon reduction in the light. The mode of regulation of other light/dark modulated enzymes is discussed.
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Cited by
The return of metabolism: biochemistry and physiology of the pentose phosphate pathway
Stincone, A., Prigione, A., Cramer, T., Wamelink, M. M. C., Campbell, K., Cheung, E., Olin‐Sandoval, V., Grüning, N., Krüger, A., Tauqeer Alam, M., et al. (2015) · Biological Reviews · doi:10.1111/brv.12140 · Cited by 1,576
Quick, W. P., Fichtner, K., Schulze, E.-D., Wendler, R., Leegood, R. C., Mooney, H., Rodermel, S. R., Bogorad, L., & Stitt, M. (1992) · Planta · doi:10.1007/bf00197044 · Cited by 263
Tsuchida, H., Tamai, T., Fukayama, H., Agarie, S., Nomura, M., Onodera, H., Ono, K., Nishizawa, Y., Lee, B.-H., Hirose, S., et al. (2001) · Plant and Cell Physiology · doi:10.1093/pcp/pce013 · Cited by 114
Flux Control of the Malate Valve in Leaf Cells
Fridlyand, L. E., Backhausen, J. E., & Scheibe, R. (1998) · Archives of Biochemistry and Biophysics · doi:10.1006/abbi.1997.0482 · Cited by 79
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Metadata
- Authors
- Scheibe, R.
- Venue
- Physiologia Plantarum
- Publisher
- Wiley
- Published
- 1987-11
- Volume
- 71
- Issue
- 3
- Pages
- 393-400
- ISSN
- 0031-9317 (ISSN-L)
- 1399-3054
- OpenAlex
- W2129421556
- Cited by
- 176
- References
- 0
- FWCI
- 2.64
- Type
- journal article
- Language
- en
- Open access
- closed
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- Scheibe, R. (1987). NADP+‐malate dehydrogenase in C3‐plants: Regulation and role of a light‐activated enzyme. Physiologia Plantarum. https://doi.org/10.1111/j.1399-3054.1987.tb04362.x
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