Article
A protease-mediated mechanism regulates the cytochrome c6/plastocyanin switch in Synechocystis sp. PCC 6803
Author/s | García Cañas, Raquel María
Giner Lamia, Joaquín Florencio Bellido, Francisco Javier López Maury, Luis |
Department | Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular |
Publication Date | 2021-01-25 |
Deposit Date | 2024-03-21 |
Published in |
|
Awards | Premio Anual Publicación Científica Destacada de la US. Facultad de Biología |
Abstract | After the Great Oxidation Event (GOE), iron availability was greatly decreased, and photosynthetic organisms evolved several alternative proteins and mechanisms. One of these proteins, plastocyanin, is a type I blue-copper ... After the Great Oxidation Event (GOE), iron availability was greatly decreased, and photosynthetic organisms evolved several alternative proteins and mechanisms. One of these proteins, plastocyanin, is a type I blue-copper protein that can replace cytochrome c6 as a soluble electron carrier between cytochrome b6f and photosystem I. In most cyanobacteria, expression of these two alternative proteins is regulated by copper availability, but the regulatory system remains unknown. Herein, we provide evidence that the regulatory system is composed of a BlaI/CopY-family transcription factor (PetR) and a BlaR-membrane protease (PetP). PetR represses petE (plastocyanin) expression and activates petJ (cytochrome c6), while PetP controls PetR levels in vivo. Using whole-cell extracts, we demonstrated that PetR degradation requires both PetP and copper. Transcriptomic analysis revealed that the PetRP system regulates only four genes (petE, petJ, slr0601, and slr0602), highlighting its specificity. Furthermore, the presence of petE and petRP in early branching cyanobacteria indicates that acquisition of these genes could represent an early adaptation to decreased iron bioavailability following the GOE. |
Funding agencies | Ministerio de Economia, Industria y Competitividad (MINECO). España Agencia Estatal de Investigación. España Junta de Andalucía European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) |
Project ID. | BIO2016-75634-P
PID2019-104513GB-I00 BIO-284 |
Citation | García Cañas, R.M., Giner Lamia, J., Florencio Bellido, F.J. y López Maury, L. (2021). A protease-mediated mechanism regulates the cytochrome c6/plastocyanin switch in Synechocystis sp. PCC 6803. PNAS, 118 (5), e2017898118. https://doi.org/10.1073/pnas.2017898118. |
Files | Size | Format | View | Description |
---|---|---|---|---|
2020-17898R_Merged_PDF.pdf | 1.183Mb | [PDF] | View/ | Versión aceptada |