Crystal structure of WA352 provides insight into cytoplasmic male sterility in rice.
Biochem Biophys Res Commun
; 501(4): 898-904, 2018 07 02.
Article
em En
| MEDLINE
| ID: mdl-29775612
ABSTRACT
Plant cytoplasmic male sterility (CMS) is an important phenomenon and is widely utilized in hybrid crop breeding. The Wild Abortive CMS (CMS-WA), a well-known CMS type, has been successfully applied in the commercial production of hybrid rice seeds for more than 40 years. The CMS-WA causal gene WA352 encodes a novel transmenbrane protein and the interacts with the mitochondrial copper chaperone COX11, triggering reactive oxygen species production and resulting in male sterility in CMS-WA lines. However, the structure of WA352 is currently unknown, and the structural mechanism whereby WA352 perturbs COX11 function to cause CMS remains largely unknown. Here, we report the crystal structure of the C-terminal functional domain of WA352 at 1.3â¯Å resolution. This functional domain, consisting of five α helices, is spindle-shaped with a length of 42â¯Å, and a diameter of 28â¯Å. Notably, the absence of any structural similarity to a known protein structure suggests that the WA352 functional domain is a novel fold. In addition, surface conservation analysis and structural modeling of the WA352-COX11 complex revealed details about the WA352-COX11 interaction. Further structural analysis suggested that the WA352-COX11 interaction blocks the copper ion transportation activity of COX11, which is essential for the assembly of cytochrome c oxidase, resulting in male sterility in CMS-WA lines. Our study paves the way toward structural determination of the WA352-COX11 complex and provides new insight into the mechanism of plant CMS.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas de Plantas
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Oryza
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Citoplasma
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Infertilidade das Plantas
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article