Structural characterization of an aldo-keto reductase (AKR2E5) from the silkworm Bombyx mori

Kohji Yamamoto, Akifumi Higashiura, Mamoru Suzuki, Takahiro Shiotsuki, Ryohei Sugahara, Takeshi Fujii, Atsushi Nakagawa

研究成果: Contribution to journalArticle査読

8 被引用数 (Scopus)


We report a new member of the aldo-keto reductase (AKR) superfamily in the silkworm Bombyx mori. Based on its amino acid sequence, the new enzyme belongs to the AKR2 family and was previously assigned the systematic name AKR2E5. In the present study, recombinant AKR2E5 was expressed, purified to homogeneity, and characterized. The X-ray crystal structures were determined at 2.2 Å for the apoenzyme and at 2.3 Å resolution for the NADPH-AKR2E5 complex. Our results demonstrate that AKR2E5 is a 40-kDa monomer and includes the TIM- or (β/α)8-barrel typical for other AKRs. We found that AKR2E5 uses NADPH as a cosubstrate to reduce carbonyl compounds such as DL-glyceraldehyde, xylose, 3-hydroxy benzaldehyde, 17α-hydroxy progesterone, 11-hexadecenal, and bombykal. No NADH-dependent activity was detected. Site-directed mutagenesis of AKR2E5 indicates that amino acid residues Asp70, Tyr75, Lys104, and His137 contribute to catalytic activity, which is consistent with the data on other AKRs. To the best of our knowledge, AKR2E5 is only the second AKR characterized in silkworm. Our data should contribute to further understanding of the functional activity of insect AKRs.

ジャーナルBiochemical and Biophysical Research Communications
出版ステータス出版済み - 5 20 2016

All Science Journal Classification (ASJC) codes

  • 生物理学
  • 生化学
  • 分子生物学
  • 細胞生物学


「Structural characterization of an aldo-keto reductase (AKR2E5) from the silkworm Bombyx mori」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。