Senior Honors Projects, 2010-2019

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Date of Graduation

Spring 2019

Document Type


Degree Name

Bachelor of Science (BS)


Department of Integrated Science and Technology


Stephanie Stockwell

Louise M. Temple

Kyle Seifert


Bradyrhizobium japonicum is a Gram-negative soil bacterium commonly known for its agriculturally significant mutualistic relationship with soybean. In this symbiosis, the bacteria and plant undergo complex molecular signaling characterized by sent and received signals resulting in the formation of infection threads and root nodules. This research aimed to compare two related bacterial outer membrane proteins, FegA and FhuA, associated with the molecular signaling between the bacteria and plant. Previous work has led to the hypothesis that the N-terminal domain (NTD) of FegA in B. japonicum is needed for a functional symbiosis to occur. Recombinant bacterial strains expressing altered FegA proteins were constructed, verified, and tested for their role in symbiosis. The recombinant FegA protein lacking the full-length NTD (FegAΔNTD) was unable to complement a fegAB mutant’s symbiotic defect. Future studies will investigate the stability and function of FegAΔNTD.



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