Honors Program

Honors in Health Sciences: Microbiology

Date of Award


Thesis Professor(s)

Dr. Dhirendra Kumar

Thesis Professor Department

Biological Sciences

Thesis Reader(s)

Dr. Sean Fox


Subcellular Localization of Tobacco SABP2 under Normal and Stress Conditions

Salicylic acid (SA), a phytohormone, plays an important role in plant physiology. SA mediated innate immune pathway is an important pathway for plant immunity against pathogens. Plants resisting pathogen infection synthesize higher levels of Methyl Salicylate (MeSA), which is then converted to SA by the esterase activity of Salicylic Acid Binding Protein 2 (SABP2). The high level of the converted SA leads to enhanced pathogen resistance. The study of subcellular localization of a protein is critical in explaining its potential biochemical functions. SABP2 tagged with eGFP was expressed transiently in Nicotiana benthamiana leaves. The SABP2-eGFP expressing leaves were challenged with bacterial and viral pathogens and observed under confocal microscopy. Fluorescent signals were seen throughout the cell and more concentrated towards the cell periphery. To verify the localization, mCherry fluorescent organelle markers with specific targeting sequences were used. The results indicate that the SABP2 is likely a cytoplasmic protein, and there is no change in its localization upon infection by plant pathogens.


East Tennessee State University

Document Type

Honors Thesis - Open Access

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.


Copyright by the authors.