Document Type

Article

Publication Date

10-16-2018

Publication Title

Frontiers in Plant Science

Volume

9

Pages

7

Abstract

The ADP-glucose pyrophosphorylase from wheat endosperm controls starch synthesis in seeds and has unique regulatory properties compared to others from this family. It comprises two types of subunits, but despite its importance little is known about their roles. Here, we synthesized de novo the wheat endosperm ADP-glucose pyrophosphorylase small (S) and large (L) subunit genes, heterologously expressed them in Escherichia coli, and kinetically characterized the recombinant proteins. To understand their distinct roles, we co-expressed them with well characterized subunits from the potato tuber enzyme to obtain hybrids with one S subunit from one source and an L subunit from the other. After kinetic analyses of these hybrids, we concluded that the unusual insensitivity to activation of the wheat endosperm enzyme is caused by a pre-activation of the L subunit. In addition, the heat stability and sensitivity to phosphate are given by the S subunit.

Comments

Author Posting. © The Authors 2018. This article is posted here for personal use, not for redistribution. The article was published in Frontiers in Plant Science, 2018, https://doi.org/10.3389/fpls.2018.01498

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

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