1
|
Shimizu A, Tobe R, Aono R, Inoue M, Hagita S, Kiriyama K, Toyotake Y, Ogawa T, Kurihara T, Goto K, Prakash NT, Mihara H. Initial Step of Selenite Reduction via Thioredoxin for Bacterial Selenoprotein Biosynthesis. Int J Mol Sci 2021; 22:ijms222010965. [PMID: 34681630 PMCID: PMC8538045 DOI: 10.3390/ijms222010965] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/05/2021] [Accepted: 10/08/2021] [Indexed: 12/11/2022] Open
Abstract
Many organisms reductively assimilate selenite to synthesize selenoprotein. Although the thioredoxin system, consisting of thioredoxin 1 (TrxA) and thioredoxin reductase with NADPH, can reduce selenite and is considered to facilitate selenite assimilation, the detailed mechanism remains obscure. Here, we show that selenite was reduced by the thioredoxin system from Pseudomonas stutzeri only in the presence of the TrxA (PsTrxA), and this system was specific to selenite among the oxyanions examined. Mutational analysis revealed that Cys33 and Cys36 residues in PsTrxA are important for selenite reduction. Free thiol-labeling assays suggested that Cys33 is more reactive than Cys36. Mass spectrometry analysis suggested that PsTrxA reduces selenite via PsTrxA-SeO intermediate formation. Furthermore, an in vivo formate dehydrogenase activity assay in Escherichia coli with a gene disruption suggested that TrxA is important for selenoprotein biosynthesis. The introduction of PsTrxA complemented the effects of TrxA disruption in E. coli cells, only when PsTrxA contained Cys33 and Cys36. Based on these results, we proposed the early steps of the link between selenite and selenoprotein biosynthesis via the formation of TrxA–selenium complexes.
Collapse
Affiliation(s)
- Atsuki Shimizu
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Ryuta Tobe
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Riku Aono
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Masao Inoue
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
- R-GIRO, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan
| | - Satoru Hagita
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Kaito Kiriyama
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Yosuke Toyotake
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Takuya Ogawa
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Tatsuo Kurihara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Kei Goto
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;
| | - N. Tejo Prakash
- School of Energy and Environment, Thapar Institute of Engineering and Technology, Patiala 147004, Punjab, India;
| | - Hisaaki Mihara
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
- Correspondence: ; Tel.: +81-(0)77-561-2732
| |
Collapse
|
2
|
Hagita S, Osaka M, Shimokado K, Yoshida M. Abstract: P654 OXIDATIVE STRESS IN CIRCULATING LEUKOCYTES, BUT NOT IN THE VASCULATURES, PLAYS A DOMINANT ROLE IN THEIR ADHESION DURING ACUTE PHASE VASCULAR INJURY. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)70822-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|