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- W2970793822 abstract "L-aspartate aminotransferase is a pyridoxal 5ʹ-phosphate-dependent transaminase that catalyzes reversible transfer of an α-amino group from aspartate to α-ketoglutarate or from glutamate to oxaloacetate. L-aspartate aminotransferase not only mediates amino acid and carbohydrate metabolism but also regulates the cellular level of amino acids by catalyzing amino acid degradation and biosynthesis. To expand our structural information, we determined the crystal structure of L-aspartate aminotransferase from Schizosaccharomyces pombe at 2.1 Å resolution. A structural comparison between two yeast L-aspartate aminotransferases revealed conserved enzymatic mechanism mediated by the open–closed conformational change. Compared with higher eukaryotic species, L-aspartate aminotransferases showed distinguishable inter-subunit interaction between the N-terminal arm and a large domain of the opposite subunit. Interestingly, structural homology search showed varied conformation of the N-terminal arm among 71 structures of the family. Therefore, we classified pyridoxal 5ʹ-phosphate-dependent enzymes into eight subclasses based on the structural feature of N-terminal arms. In addition, structure and sequence comparisons showed strong relationships among the eight subclasses. Our results may provide insights into structure-based evolutionary aspects of pyridoxal 5ʹ-phosphate-dependent enzymes." @default.
- W2970793822 created "2019-09-05" @default.
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- W2970793822 date "2019-08-29" @default.
- W2970793822 modified "2023-09-27" @default.
- W2970793822 title "Crystal structure of L-aspartate aminotransferase from Schizosaccharomyces pombe" @default.
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- W2970793822 doi "https://doi.org/10.1371/journal.pone.0221975" @default.
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