Serine hydroxymethyltransferase (SHM) is one of the hallmarks of one-carbon metabolism. In plants, isoforms of SHM participate in photorespiration and/or transfer the one-carbon unit from L-serine to tetrahydrofolate (THF), hence producing 5,10-CH2-THF that is needed, e.g., for biosynthesis of methionine, thymidylate, and purines. These links highlight the importance of SHM activity in DNA biogenesis, its epigenetic methylations, and in stress responses. Plant genomes encode several SHM isoforms that localize to cytosol, mitochondria, plastids, and nucleus. In this work, we present a thorough functional and structural characterization of all seven SHM isoforms from Arabidopsis thaliana (AtSHM1-7). In particular, we analyzed tissue-specific expression profiles of the AtSHM genes. We also compared catalytic properties of the active AtSHM1-4 in terms of catalytic efficiency in both directions and inhibition by the THF substrate. Despite numerous attempts to rescue the SHM activity of AtSHM5-7, we failed, which points towards different physiological functions of these isoforms. Comparative analysis of experimental and predicted three-dimensional structures of AtSHM1-7 proteins indicated differences in regions that surround the entrance to the active site cavity.

Arabidopsis thaliana serine hydroxymethyltransferases: functions, structures, and perspectives / Nogués, Isabel; Sekula, Bartosz; Angelaccio, Sebastiana; Grzechowiak, Marta; Tramonti, Angela; Contestabile, Roberto; Ruszkowski, Milosz. - In: PLANT PHYSIOLOGY AND BIOCHEMISTRY. - ISSN 0981-9428. - 187:(2022), pp. 37-49. [10.1016/j.plaphy.2022.07.025]

Arabidopsis thaliana serine hydroxymethyltransferases: functions, structures, and perspectives

Sebastiana Angelaccio;Angela Tramonti;Roberto Contestabile;
2022

Abstract

Serine hydroxymethyltransferase (SHM) is one of the hallmarks of one-carbon metabolism. In plants, isoforms of SHM participate in photorespiration and/or transfer the one-carbon unit from L-serine to tetrahydrofolate (THF), hence producing 5,10-CH2-THF that is needed, e.g., for biosynthesis of methionine, thymidylate, and purines. These links highlight the importance of SHM activity in DNA biogenesis, its epigenetic methylations, and in stress responses. Plant genomes encode several SHM isoforms that localize to cytosol, mitochondria, plastids, and nucleus. In this work, we present a thorough functional and structural characterization of all seven SHM isoforms from Arabidopsis thaliana (AtSHM1-7). In particular, we analyzed tissue-specific expression profiles of the AtSHM genes. We also compared catalytic properties of the active AtSHM1-4 in terms of catalytic efficiency in both directions and inhibition by the THF substrate. Despite numerous attempts to rescue the SHM activity of AtSHM5-7, we failed, which points towards different physiological functions of these isoforms. Comparative analysis of experimental and predicted three-dimensional structures of AtSHM1-7 proteins indicated differences in regions that surround the entrance to the active site cavity.
2022
arabidopsis thaliana; serine hydroxymethyltransferase isoforms; one-carbon metabolism
01 Pubblicazione su rivista::01a Articolo in rivista
Arabidopsis thaliana serine hydroxymethyltransferases: functions, structures, and perspectives / Nogués, Isabel; Sekula, Bartosz; Angelaccio, Sebastiana; Grzechowiak, Marta; Tramonti, Angela; Contestabile, Roberto; Ruszkowski, Milosz. - In: PLANT PHYSIOLOGY AND BIOCHEMISTRY. - ISSN 0981-9428. - 187:(2022), pp. 37-49. [10.1016/j.plaphy.2022.07.025]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1653949
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