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Rice SUMOs and unification of their names.

H. Shimada,Katsunori Tanaka

Published 2023 in Genes & Genetic Systems

ABSTRACT

Posttranslational modifications (PTMs) to proteins are regulatory mechanisms that play a critical role in regulating growth and development. The SUMO system is a rapid and dynamic PTM system employed by eukaryotic cells. Plant SUMOs are involved in many physiological processes, such as stress responses, regulation of flowering time and defense reactions to pathogen attack. In Arabidopsis thaliana and rice (Oryza sativa), eight and seven SUMO genes, respectively, were predicted by sequence analysis. Phylogenetic tree analysis of these SUMOs shows that they are divided into two groups. One consists of SUMOs that contain no SUMO acceptor site and are involved in monoSUMOylation of their target proteins. Rice OsSUMO1 and OsSUMO2 are in this group, and are structurally similar to each other and to Arabidopsis AtSUMO1. The other group is composed of SUMOs in which an acceptor site (ΨKXE/D) occurs inside the SUMO molecule, suggesting their involvement in polySUMOylation. Several studies on the rice SUMOs have been performed independently and reported. Individual names of rice SUMOs are confusing, because a unified nomenclature has not been proposed. This review clarifies the attribution of seven rice SUMOs and unifies the individual SUMO names.

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