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MICHELETTO, M. C. Clorocatecol 1,2-dioxigenase e Proteína Ligante de Acil-CoA: caracterização estrutural e interações com ligantes. 2016. 126p. Dissertação (Mestrado) – Faculdade Filosofia Ciêcias e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, 2016. In this study, we used a multi technique approach to understand the basic molecular interactions of two proteins that have quite different biological functions. The first, chlorocatechol 1,2dioxygenase (Pp 1,2-CCD), has an environmental appeal due to it ability to catalyze the degradation of chlorocatechol, a common intermediate in the end of the decomposition of many polycyclic aromatic hydrocarbons. This characteristic of decontaminating polluted soils and waters suggest a great potential for applications in bioremediation mechanisms. Moreover, the presence of amphipathic molecules at the interface of the CCD monomers raised issues related to the ability of this enzyme family of binding to biological membranes. Such information broadens the knowledge of the basic mechanisms of enzyme action, increasing the possibility of interaction partners and may lead to other forms of control of the biological activity for use in biotechnological applications, such as biosensors development. The study of this enzyme is therefore, aimed at understanding their interactions with mimetic membrane and immobilization attempts of the protein in these structures. For this purpose, we make use of biophysical techniques such as circular dichroism, differential scanning calorimetry and optical spectroscopies and biomolecular techniques, such as development of primers, polymerase chain reaction and restriction analysis. The other aspect of this dissertation is focused on the study of acyl-CoA binding protein of Cryptococcus neoformans (CnACBP) cloned for first time in our laboratory. Homologues of ACBP were found in all organisms distributed in the four kingdoms of eukaryotes, with high sequence similarity (~ 48%). Its widespread presence and their involvement in several key metabolic pathways related to the acyl-CoA ester led to the conclusion that ACBP is a housekeeping protein and not a specific protein contained a specialized cell type. Here we present an initial characterization of CnACBP that seeks to relevant issues regarding the protein’s function. Our goal was to increase the still vague knowledge on how electrical charges and the presence of the binding partner may influence the structure, stability and function through thermodynamic and spectroscopic techniques. This is an initial step toward the full understanding of the role of protein in the cell.