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1.1 The potential of bioinformatics for the study of protein structure and function Proteins are macromolecules formed by amino acid polymers that regulate cellular functions. Each protein is composed by the repetition and combination of 20 different amino acids, whose order is determined by the genetic code. To perform their biological functions, proteins fold into one or more specific spatial conformations, determined by non-covalent interactions such as hydrogen bonding, ionic interactions, Van der Waals forces and hydrophobic packing, and covalent interactions, such as disulfide bonds (Chiang et al., 2007). Determining the structure and function of a protein is a milestone of many aspects of modern biology to understand its role in cell physiology. Bioinformatics is the research, development or application of computational approaches for expanding the use of biological, medical, behavioral or health-related data. It also includes those tools to acquire, store, organize, archive, analyze or visualize infomation. Over the past years, bioinformatical tools have been widely used for the prediction and study of protein biology. Moreover, bioinformatical tools have revealed the existence of protein “interactomes”, demonstrating the interaction among distinct biomolecules (protein-protein, protein-lipids, protein-carbohydrates, etc.) to perform cellular processes (Kuchaiev & Przulj, 2011). During the last decades, genome sequencing projects together with bioinformatics programs and algorithms have enormously contributed to understand protein structure, protein interactions and protein functions. At present, over six million unique protein sequences have been deposited in public databases, and this number is increasing rapidly. Meanwhile, despite the progress of high-throughput structural genomics initiatives, just over 50,000 protein structures have been experimentally determined (Kelley & Sterberg, 2009). The greatest challenge the molecular biology community is facing today is to analyze the wealth of data that has been produced by the genome sequencing projects, where bioinformatics

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