ScRpb4, Encoding an RNA Polymerase Subunit from Sugarcane, Is Ubiquitously Expressed and Resilient to Changes in Response to Stress Conditions

Taehoon Kim, Fábio Ometto Dias, Agustina Gentile, Marcelo Menossi and Kevin Begcy
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Taehoon Kim: Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, USA
Fábio Ometto Dias: Functional Genome Laboratory, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, State University of Campinas, Campinas 13083-862, Brazil
Agustina Gentile: Functional Genome Laboratory, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, State University of Campinas, Campinas 13083-862, Brazil
Marcelo Menossi: Functional Genome Laboratory, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, State University of Campinas, Campinas 13083-862, Brazil
Kevin Begcy: Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, USA

Agriculture, 2022, vol. 12, issue 1, 1-14

Abstract: RNA polymerase II is an essential multiprotein complex that transcribes thousands of genes, being a fundamental component of the transcription initiation complex. In eukaryotes, RNA polymerase II is formed by a 10-multisubunit conserved core complex, and two additional peripheral subunits, Rpb4 and Rpb7, form the Rpb4/7 subcomplex. Although transcription is vital for cell and organismal viability, little is known about the transcription initiation complex in sugarcane. An initial characterization of the sugarcane RNA polymerase subunit IV (ScRpb4) was performed. Our results demonstrate that ScRpb4 is evolutionarily conserved across kingdoms. At the molecular level, ScRpb4 expression was found in vegetative and reproductive tissues. Furthermore, the expression of ScRpb4 remained stable under various stress conditions, most likely to ensure a proper transcriptional response. Optimal conditions to express ScRpb4 in vitro for further studies were also identified. In this study, an initial characterization of the sugarcane polymerase II subunit IV is presented. Our results open the window to more specific experiments to study ScRpb4 function, for instance, crystal structure determination and pull-down assays as well as their function under biotic and abiotic stresses.

Keywords: ScRpb4; sugarcane; RNA polymerase II; abiotic stress; biotic stress; protein expression (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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