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Plant Molecular Biology Reporter

, Volume 36, Issue 3, pp 491–499 | Cite as

Ribosomal Heterogeneity of Maize Tissues: Insights of Biological Relevance

  • Ricardo A Hernández-Hermenegildo
  • Lilia Bernal
  • Laura V Jiménez-Pérez
  • Irma Bernal-Lugo
  • Estela Sánchez de Jiménez
Original Paper
  • 93 Downloads

Abstract

In recent years, the selective role of ribosomes in the translational process of eukaryotes has been suggested. Evidence indicates that ribosomal heterogeneity at the level of protein stoichiometry and phosphorylation status differs among organisms, suggesting ribosomal specialization according to the state of development and the surrounding environment. During germination, protein synthesis is an active process that begins with the translation of the mRNAs stored in quiescent seeds and continues with the newly synthesized mRNAs. In this study, we identified differences in the abundance of ribosomal proteins (RPs) in maize embryos at different developmental stages. The relative quantification of RPs during germination revealed changes in six small subunit proteins, S3 (uS3), S5 (uS7), S7 (eS7), two isoforms of S17 (eS17), and S18 (uS13), and nine large subunit proteins, L1 (uL1), L5 (uL18), two isoforms of P0 (uL10), L11 (uL5), L14 (eL14), L15 (eL15), L19 (eL19), and L27 (eL27). Further analysis of ribosomal protein phosphorylation during germination revealed that the phosphorylation of PRP0 (uL10) and P1 increased and that of PRS3 (uS3) decreased in germinated versus quiescent embryos. The addition of insulin during germination increased the phosphorylation of the P1 protein, suggesting that its phosphorylation is controlled by the TOR pathway. Our results indicate that a heterogeneous ribosomal population provides to maize ribosomes during germination a different ability to translate mRNAs, suggesting another level of regulation by the ribosomes.

Keywords

Ribosomes Ribosomal protein heterogeneity Ribosomal protein phosphorylation 

Notes

Acknowledgments

We thank Dr. Verónica Garrocho-Villegas for her comments to improve the manuscript; also, we wish to thank Biol. Jorge Herrera and Q. Margarita Guzmán from Unidad de Servicio de Apoyo a la Investigación y a la Industria for their support in mass spectrometry analysis and protein identification.

Funding Information

This research was supported by Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM), project PAPIIT IN214214.

Supplementary material

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PD Quest analysis of the selected proteins in 2D electrophoresis. The numbers identify each spot on the gel (PNG 2.33 mb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Departamento de Bioquímica, Facultad de QuímicaUniversidad Nacional Autónoma de MéxicoCiudad de MéxicoMéxico

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