The Regulation of the Activity of Soluble Starch Synthase in Spinach Leaves by a Calcium-Calmodulin Dependent Protein Kinase

Dreier, W.; Preusser, Erhard; Gründel, Marianne

doi:10.1016/s0015-3796(11)80013-2

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…In the case of PHO1, six phosphorylation sites were identified, five of which are closely clustered together in a highly acidic region of the protein. Dreier et al (1992) showed that SS activity could be stimulated by ATP and that this might involve a calcium-calmodulindependent protein kinase, though there was no indication of which isoforms of SS were involved. The L78 region of PHO1 represents a large insertion that is typical for PHO1 in plastids of higher plants, but is not observed in the cytosolic isozyme nor in the well-studied glycogen phosphorylase.…”

Section: Regulation Of Protein Complex Formation By Protein Phosphorymentioning

confidence: 99%

Starch

2015

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Section: Regulation Of Protein Complex Formation By Protein Phosphorymentioning

confidence: 99%

Starch

2015

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“…The presence of calmodulin in plastids implies a role for calmodulin in starch biosynthesis and degradation during plant growth and differentiation (Mitsui et al 1984;Preusser et al 1988;Dreier et al 1992), possibly by reversible, Ca 2 + -dependent, phosphorylation of proteins as was described for amyloplasts of sycamore cells (Ranjeva & Boudet 1987). In Nicotiana tabacum and Datura innoxia cell cultures, a protein kinase was isolated from plastids and the activity of this enzyme correlates with rapid cell proliferation and starch accumulation (Bacher et al 1985).…”

Section: Discussionmentioning

confidence: 99%

An immunofluorescence study on calmodulin distribution during somatic and zygotic embryogenesis of carrot (Daucus carotaL.)

Timmers

Kieft

Schel

1995

Acta Botanica Neerlandica

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The distribution of calmodulin was studied during somatic and zygotic embryogenesis and during germination of carrot. Calmodulin levels were visualized by immunofluorescence, using semi-thin sections of different developmental stages of embryogenesis. In proembryogenic masses the distribution of calmodulin was highly variable between individual cells. In later stages of somatic embryogenesis, calmodulin was mainly found associated with organelles in the protoderm. In contrast, in zygotic embryos calmodulin was found to be evenly distributed over the entire embryo. A polarized distribution of calmodulin was observed during germination of the zygotic embryos. Calmodulin was mainly found in the cytoplasm of the epidermis of the cotyledons and the hypocotyl, but was clearly associated with organelles in the root side of the germling. It is concluded that the distribution of calmodulin differs in somatic and zygotic embryos of carrot and that the distribution in somatic embryos resembles the distribution in germinating zygotic embryos.

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“…Importantly, Makhmoudova et al (2014) for these residues and their regulation. Dreier et al (1992) showed that SS activity could be stimulated by ATP and that this might involve a calcium-calmodulindependent protein kinase, though there was no indication of which isoforms of SS were involved. Whether the same CDPKs are involved in regulating glucan chain elongation and branching remains speculative at this stage.…”

Section: Regulation Of Protein Complex Formation By Protein Phosphorymentioning

confidence: 99%

Protein-Protein Interactions During Starch Biosynthesis

Tetlow

Liu

Emes

2015

Starch

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Starch biosynthesis requires the ordered assembly of glucose units into amylose and amylopectin from ADPglucose. Whilst amylose has a relatively simple linear structure, the synthesis of amylopectin requires the formation of regular, repeating clusters of glucan chains. These clusters have a 9 nm periodicity and comprise a crystalline, alpha helical region and an amorphous branched region, a unit which is repeated many times over to give rise to blocklets of amylopectin. Although the individual enzymes of starch biosynthesis have been studied extensively, our knowledge of the mechanisms which give rise to this highly ordered structure is limited. There is an increasing body of literature which has demonstrated that several reactions are regulated post-translationally, including via redox modulation, protein-protein interactions and protein phosphorylation. This chapter summarises our current knowledge of these mechanisms and offers a model of how they serve to coordinate the biosynthesis of amylopectin in particular.

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The Regulation of the Activity of Soluble Starch Synthase in Spinach Leaves by a Calcium-Calmodulin Dependent Protein Kinase

Cited by 7 publications

References 21 publications

Starch

Starch

An immunofluorescence study on calmodulin distribution during somatic and zygotic embryogenesis of carrot (Daucus carotaL.)

Protein-Protein Interactions During Starch Biosynthesis

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