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Kitazaki K, Arakawa T, Matsunaga M, Yui-Kurino R, Matsuhira H, Mikami T, Kubo T. Post-translational mechanisms are associated with fertility restoration of cytoplasmic male sterility in sugar beet (Beta vulgaris). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 83:290-9. [PMID: 26031622 DOI: 10.1111/tpj.12888] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/08/2015] [Accepted: 05/15/2015] [Indexed: 05/20/2023]
Abstract
Genetic conflict between cytoplasmically inherited elements and nuclear genes arising from their different transmission patterns can be seen in cytoplasmic male sterility (CMS), the mitochondrion-encoded inability to shed functional pollen. CMS is associated with a mitochondrial open reading frame (ORF) that is absent from non-sterility inducing mitochondria (S-orf). Nuclear genes that suppress CMS are called restorer-of-fertility (Rf) genes. Post-transcriptional and translational repression of S-orf mediates the molecular action of Rf that encodes a class of RNA-binding proteins with pentatricopeptide repeat (PPR) motifs. Besides the PPR-type of Rfs, there are also non-PPR Rfs, but the molecular interactions between non-PPR Rf and S-orf have not been described. In this study, we investigated the interaction of bvORF20, a non-PPR Rf from sugar beet (Beta vulgaris), with preSatp6, the S-orf from sugar beet. Anthers expressing bvORF20 contained a protein that interacted with preSATP6 protein. Analysis of anthers and transgenic calli expressing a FLAG-tagged bvORF20 suggested the binding of preSATP6 to bvORF20. To see the effect of bvORF20 on preSATP6, which exists as a 250-kDa protein complex in CMS plants, signal bands of preSATP6 in bvORF20-expressing and non-expressing anthers were compared by immunoblotting combined with Blue Native polyacrylamide gel electrophoresis. The signal intensity of the 250-kDa band decreased significantly, and 200- and 150-kDa bands appeared in bvORF20-expressing anthers. Transgenic callus expressing bvORF20 also generated the 200- and 150-kDa bands. The 200-kDa complex is likely to include both preSATP6 and bvORF20. Post-translational interaction between preSATP6 and bvORF20 appears to alter the higher order structure of preSATP6 that may lead to fertility restoration in sugar beet.
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Affiliation(s)
- Kazuyoshi Kitazaki
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
| | - Takumi Arakawa
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
| | - Muneyuki Matsunaga
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
| | - Rika Yui-Kurino
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
| | - Hiroaki Matsuhira
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
| | - Tetsuo Mikami
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
| | - Tomohiko Kubo
- Research Faculty of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan
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