RESUM. In recent years there is a great interest in the integration of proteins within electronic devices. For best device performance, better understanding of charge transfer through the proteins in solid state configurations and at their interface with inorganic materials should be gained. Furthermore, since proteins did not evolve to carry out such tasks, the targeted design of proteins for these specific applications is of great importance. Our research focuses on the development and electronic characterization of simple artificial protein systems for molecular electronics applications. This approach will be presented here using common protein motifs such as a-helices and b-sheets which are adopted to function in molecular junction configurations. In addition, I will show how inorganic peptide binders, which were selected by biological combinatorial libraries screening tests, can be used to control and modify the electronic properties of semiconductor surfaces. Our studies demonstrate the great potential of the use of specifically designed proteins as components of electronic devices. Moreover, I will show that such systems can be used as simple platforms for understanding the role of different charge transfer mechanisms in proteins.