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Smilja Todorovic Lab

Raman BioSpectroscopy

We are interested in fundamental questions and biotechnological applications of metalloproteins that carry out catalysis, detoxification, signaling, electron transfer and DNA repair. We study their mechanistic properties and immobilize them on tailored plasmonic metal hybrids to probe molecular processes at interfaces or construct biosensing devices. We use advanced vibrational spectroscopy, electrochemistry and spectroelectrochemistry as the main tools in our research.

Smilja Todorovic
Principal Investigator
PhD in 2000, Belgrade University, Serbia
Mayo Clinic Graduate school, USA

Phone (+351) 214469717 | Extension 1717
Email smilja@itqb.unl.pt

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Research Interests

Spectroscopy, structure and function: We use physical tools, vibrational spectroscopy, electrochemistry and spectroelectrochemistry, to investigate biophysico-chemical properties of heme, non-hemic iron, Fe-S and Cu containing metalloproteins with distinct cellular functions. Metal centers constitute active sites of over one third of all enzymes and we aim at understanding how different proteins fine-tune the reactivity of their metal cofactors and how such metal centers help to tailor the dynamics and stability of protein molecules.

Spectroscopy of immobilized metalloproteins and applications: By wiring enzymes to biocompatible conductive supports (i.e. electrodes), we design metalloenzyme-electrode constructs to study molecular processes at interfaces, which are ubiquitous in biology and also constitute the basis for the functioning of biosensoric devices.

We monitor structural properties and interactions of immobilized metalloenzymes by surface enhanced resonance Raman (SERR) and IR (SEIRA) spectro-electrochemistry and catalysis by electrochemistry. We study enzymes that

  1. are interesting for development of biosensors, e.g. DyP and micro-peroxidases; we can take advantage of the high specificity of enzymatic reactions to detect the enzyme substrate and monitor the structure of the biocatalyst along the catalytic reaction;
  2. exert their function in conditions of restricted motion, such as membrane proteins;
  3. can be co-immobilized with substrate / physiological redox partners, e.g. DNA : DNA glycosylases.

Spectroscopy of cells: We are also interested in Label-free chemical imaging of cells, which is based on specific Raman fingerprint of biomolecules as well as in surface enhanced Raman (SER) detection of viruses and bacteria. 

Group Members

  • Célia Silveira, Researcher
  • Lidia Zuccarello, Post-doc Fellow
  • Filipe Rollo, PhD student (supervision with Elin Moe)
  • Catarina Barbosa, BI fellow

 

Selected Publications

 

  1. Silveira, C.M., Castro, M.A., Dantas, J.M., Salgueiro, C., Murgida, D.H., Todorovic S. 2017 ‘Structure, Electrocatalysis and Dynamics of Immobilized Cytochrome PccH and its Microperoxidase’, PhysChemChemPhys 19, 8908-8918.

  2. Todorovic, S. 2016 ‘Surface-Enhanced Raman Scattering of Biological Materials’ in Encyclopedia of Analytical Chemistry, eds R. A. Meyers, John Wiley & Sons: Chichester DOI: 10.1002 / 9780470027318.a9574.

  3. Moe, E., Hildebrandt, P., Sezer, M., Todorovic, S. 2015 ´Surface enhanced vibrational spectroscopic evidence for an alternative DNA-independent redox activation of Endonuclease III´ Chem. Comm. 51, 3255-3257

Laboratory's Website

For further information visit the laboratory's website

 

BioEspectroscopia de Raman (PT)

Estamos interessados em questões fundamentais e aplicações biotecnológicas de metaloproteínas envolvidas em reacções de catálise, destoxificação, sinalização, transferência electrónica e reparação de DNA. Estudamos as propriedades mecanísticas destas metaloproteínas e imobilizamo-las em híbridos proteína-metal plasmónico para estudar os seus processos moleculares em interfaces ou para construir biossensores. Utilizamos espectroscopias vibracionais avançadas, electroquímica e espectroelectroquímica como principais ferramentas.

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