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In this thesis the three dimensional solution strucutre of the RbfA protein from Thermotoga maritima was solved using multidimensional heteronuclear NMR spectroscopy. The RbfA protein binds to the helix I region of the 16S rRNA. To gain insights into the binding mode of RbfA to its target, a second RbfA construct from Helicobacter pylori was used. Comparison of the RbfA proteins with the published structure of RbfA from Escherichia coli, led to studies concerning the differences between proteins from thermophile and mesophile systems. In the second part of this thesis the native binding motive of the RbfA protein was identified. The RbfA protein binds to an alternate helix fold within the pre-sequence of the immature 16S rRNA.