PRELIMINARY ABSTRACT: --------------------- Introducing FIASCO: Fragment-based Interactive Assembly for protein Structure prediction with COnstraints Michael Best, Kabi Bhattarai, Federico Campeotto, Alessandro Dal Palu, Hung Dang, Agostino Dovier, Ferdinando Fioretto, Federico Fogolari, Trung Le and Enrico Pontelli Keywords: Protein Structure, Constraint Programming, Fragments Assembly Abstract: The paper summarizes the recent developments in the creation of a constraint-based framework for the analysis of protein conformations. The framework is designed to be used by chemists, biologists, and computer scientists to provide new insights in the structural analysis of proteins. The framework is composed of two parts: a graphical and web-based user interface and a parallel constraint solving engine. The solver is able to model the geometric and energetic properties of proteins and perform a conformational search among structure candidates. The paper reports the design and preliminary experimental considerations.