Speciation of selenomethionine metabolites in wheat germ extract
Literature Information
Yasumitsu Ogra, Takashi Kitaguchi, Kazuya Ishiwata, Noriyuki Suzuki, Toshihiko Toida, Kazuo T. Suzuki
Selenometabolites transformed from selenomethionine (SeMet) in wheat germ extract (WGE) were identified by complementary use of HPLC-ICP-MS and HPLC-ESI-MS/MS. Three selenium (Se)-containing peaks tentatively named WGE1, WGE2, and WGE3 were detected by HPLC-ICP-MS. WGE1 had [M]+ at m/z 212 on HPLC-ESI-MS analysis, and its fragment ions indicated that WGE1 is selenomethionine methylselenonium (MeSeMet). WGE2 and WGE3 exhibited absorption at 254 nm and molecular ions at m/z 433 and 447, respectively. Their fragment ions revealed that WGE2 and WGE3 are Se-adenosylselenohomocysteine (AdoSeHcy) and Se-adenosylselenomethionine (AdoSeMet), respectively. Their structures were coincident with the absorption of WGE2 and WGE3 at 254 nm. In addition, a trace amount of AdoSeMet was suggested to also exist in rabbit reticulocyte lysate, a mammalian in vitro translation system, because the transformation of AdoSeMet from SeMet was completely inhibited by (2S)-2-amino-4,5-epoxypentanoic acid (AEPA), a potent inhibitor of AdoMet synthetase. These results suggest that SeMet and methionine (Met) share a common metabolic pathway, i.e., SeMet is not only incorporated into proteins in place of Met but also metabolized to AdoSeMet in higher eukaryotes and MeSeMet in plants.
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Source Journal
Metallomics

Metallomics publishes cutting-edge investigations aimed at elucidating the identification, distribution, dynamics, role and impact of metals and metalloids in biological systems. Studies that address the “what, where, when, how and why” of these inorganic elements in cells, tissues, organisms, and various environmental niches are welcome, especially those employing multidisciplinary approaches drawn from the analytical, bioinorganic, medicinal, environmental, biophysical, cell biology, plant biology and chemical biology communities. We are particularly interested in articles that enhance our chemical and/or physical understanding of the molecular mechanisms of metal-dependent life processes, and those that probe the common space between metallomics and other ‘omics approaches to uncover new insights into biological processes. Metallomics seeks to position itself at the forefront of those advances in analytical chemistry destined to clarify the enormous complexity of biological systems. As such, we particularly welcome those papers that outline cutting-edge analytical technologies, e.g., in the development and application of powerful new imaging, spectroscopic and mass spectrometric modalities. Work that describes new insights into metal speciation, trafficking and dynamics in complex systems or as a function of microenvironment are also strongly encouraged. Studies that examine the interconnectivity of metal-dependent processes with systems level responses relevant to organismal health or disease are also strongly encouraged, for example those that probe the effect of chemical exposure on metal homeostasis or the impact of metal-based drugs on cellular processes.