John Kalyvas

Teaching Strengths

Chemistry (general, physical)
Biochemistry

Mr John Kalyvas

School of Physics, Chemistry and Earth Sciences

College of Sciences


I am a postdoctoral researcher in medicinal peptide chemistry specialising in the design and synthesis of peptidomimetics to modulate protein-protein interactions in cancer. My current work focuses on the MYBL2-MuvB transcriptional complex, a key oncogenic driver in aggressive prostate cancer, where I develop conformationally constrained macrocyclic and turn-mimetic ligands to disrupt this interaction and suppress tumour-promoting gene expression.
 
My research integrates rational molecular design, solid-phase peptide and peptidomimetic synthesis, and advanced biophysical and computational methods to optimise binding, stability, and cellular activity. I work at the interface of chemistry and biology, using structure-guided design, docking, and SAR analysis to drive the development of first-in-class inhibitors of challenging intracellular targets.
 
Alongside my oncology work, I remain actively involved in the development of cyclic peptide-based antibiotics targeting multidrug-resistant ESKAPE pathogens. This includes the synthesis and optimisation of macrocyclic antimicrobial peptides with improved therapeutic windows, informed by NMR-derived structural data and machine-learning-guided SAR models.
 
Across both cancer and infectious-disease programs, my broader research vision is to build scalable chemical platforms for the discovery of biologically active macrocycles and peptidomimetics that can access targets beyond the reach of traditional small molecules. My work is driven by the goal of translating rigorous chemical innovation into new therapies for diseases with high unmet clinical need.

I am a postdoctoral researcher in medicinal peptide chemistry specialising in the design and synthesis of peptidomimetics to modulate protein-protein interactions in cancer. My current work focuses on the MYBL2-MuvB transcriptional complex, a key oncogenic driver in aggressive prostate cancer, where I develop conformationally constrained macrocyclic and turn-mimetic ligands to disrupt this interaction and suppress tumour-promoting gene expression.

My research integrates rational molecular design, solid-phase peptide and peptidomimetic synthesis, and advanced biophysical and computational methods to optimise binding, stability, and cellular activity. I work at the interface of chemistry and biology, using structure-guided design, docking, and SAR analysis to drive the development of first-in-class inhibitors of challenging intracellular targets.

Alongside my oncology work, I remain actively involved in the development of cyclic peptide-based antibiotics targeting multidrug-resistant ESKAPE pathogens. This includes the synthesis and optimisation of macrocyclic antimicrobial peptides with improved therapeutic windows, informed by NMR-derived structural data and machine-learning-guided SAR models.

Across both cancer and infectious-disease programs, my broader research vision is to build scalable chemical platforms for the discovery of biologically active macrocycles and peptidomimetics that can access targets beyond the reach of traditional small molecules. My work is driven by the goal of translating rigorous chemical innovation into new therapies for diseases with high unmet clinical need.

Date Institution name Country Title
2022 - 2025 University of Adelaide Australia Doctor of Philosophy (PhD)
2019 - 2021 University of Adelaide Australia Bachelor of Science

Year Citation
2025 Wang, Y., Kalyvas, J. T., Evans, J. D., Toronjo-Urquiza, L., Horsley, J. R., & Abell, A. D. (2025). Expanding the therapeutic window of gramicidin S towards a safe and effective systemic treatment of methicillin-resistant S. aureus infections. European Journal of Medicinal Chemistry, 283, 117128-1-117128-9.
DOI Scopus5 WoS6 Europe PMC5
2025 Kalyvas, J. T., Wang, Y., Romeo, O., Horsley, J. R., & Abell, A. D. (2025). Broad-Spectrum Gramicidin S Derivatives with Potent Activity Against Multidrug-Resistant Gram-Negative ESKAPE Pathogens. Antibiotics, 14(5), 423-1-423-14.
DOI Scopus4 WoS2 Europe PMC1
2025 Kalyvas, J. T., Wang, Y., Horsley, J. R., & Abell, A. D. (2025). Machine-Learning Approach to Increase the Potency and Overcome the Hemolytic Toxicity of Gramicidin S. Journal of Medicinal Chemistry, 68(15), 16093-16102.
DOI Scopus3 WoS3 Europe PMC1
2024 Kalyvas, J. T., Wang, Y., Toronjo-Urquiza, L., Stachura, D. L., Yu, J., Horsley, J. R., & Abell, A. D. (2024). A New Gramicidin S Analogue with Potent Antibacterial Activity and Negligible Hemolytic Toxicity. Journal of Medicinal Chemistry, 67(13), 10774-10782.
DOI Scopus11 WoS11 Europe PMC11
2024 Stachura, D. L., Kalyvas, J. T., & Abell, A. D. (2024). New Potent Sulfonamide-Based Inhibitors of <i>S</i>. <i>aureus</i> Biotin Protein Ligase. ACS Medicinal Chemistry Letters, 15(9), 1467-1473.
DOI Scopus1 WoS1
2023 Kalyvas, J. T., Marina, P. F., Stachura, D. L., Horsley, J., & Abell, A. D. (2023). Smart Wearable Patches Using Light-Controlled Activation and Delivery of Photoswitchable Antimicrobial Peptides. Chemistry, 29(46), 1-8.
DOI Scopus4 WoS3 Europe PMC3

Online Tutor – UO Introduction to Engineering Chemistry

Online Tutor – UO Numeracy & Problem Solving

Level III Chemistry Demonstrator


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