Molecular characterization and expression analysis of a phosphoserine aminotransferase involving l-serine synthesis from silkworm, Bombyx mori

Mohammad R. Haque, Aiko Hirowatari, Ayumi Koyanagi, Takashi Ichinose, Maiko Abiru, Shinya Mohri, Shigeki Furuya, Kohji Yamamoto

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1 Citation (Scopus)

Abstract

In this study, we identified and characterized a phosphoserine aminotransferase (bmPSAT) from Bombyx mori (B. mori) that is responsible for l-serine biosynthesis. A complementary DNA that encodes bmPSAT was cloned by reverse transcriptase polymerase reaction and sequenced. The presumed amino acid sequence revealed 47–87% identity with known PSATs from insects, humans, plants, and bacteria. Through phylogenetic analysis, we found that bmPSAT is evolutionary related to insect PSATs. Recombinant bmPSAT was produced in Escherichia coli by using a cold-shock promotor and purified to homogeneity. This enzyme utilizes phosphohydroxypyruvate and glutamate for transamination. bmPSAT messenger RNA (mRNA) was expressed at higher levels in several tissues of standard strain silkworm including the silk gland, whereas a sericin-deficient silkworm strain exhibited a diminished expression of bmPSAT mRNA in the silk gland. These findings indicate that bmPSAT may play an important role in synthesizing and supplying l-serine in the larva of B. mori.

Original languageEnglish
Article numbere21553
JournalArchives of insect biochemistry and physiology
Volume101
Issue number2
DOIs
Publication statusPublished - Jun 2019

All Science Journal Classification (ASJC) codes

  • Physiology
  • Biochemistry
  • Insect Science

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